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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Sterkhova I. V., Lesnikov M. K.
Заглавие : Structure of Barbituratobis(2,2'-Dipyridyl)copper(II) Heptahydrate
Коллективы : Ministry of Education and Science of the Russian Federation [4.7666.2017/BCh]
Место публикации : Russ. J. Coord. Chem. - 2019. - Vol. 45, Is. 8. - P.569-572. - ISSN 1070-3284, DOI 10.1134/S1070328419080037. - ISSN 1608-3318(eISSN)
Примечания : Cited References: 25. - This work was supported by the Ministry of Education and Science of the Russian Federation in the framework of the state task for the Siberian Federal University for 2017-2019 (4.7666.2017/BCh).
Предметные рубрики: IONIC CO-CRYSTALS
BARBITURIC-ACID
COMPLEXES
STATE
Аннотация: The structure of the complex [Cu(Bipy)2(BA)] ∙ 7H2O (I), where Bipy is 2,2'-dipyridyl, and BA2– is the barbituric acid anion (H2BA), is determined (CIF file CCDC no. 1887338). The thermal decomposition and IR spectrum of complex I are studied. The crystals are orthorhombic: a = 26.118(3), b = 27.685(3), c = 15.683(2) Å, V = 11 370(2) Å3, space group Fdd2, Z = 16. The discrete structure of the polar crystal consists of neutral [Cu(Bipy)2(BA)] particles and molecules of crystallisation water . The Cu2+ ion is bound to the N atoms of two bidentate Bipy molecules and the N atom of the BA2− ion at the vertices of the trigonal bipyramid CuN5. Compound I is the first example of the metal complex only with the N-coordinated anions of barbituric acid (BA2−, НBA−). The structure is stabilized by hydrogen bonds O−H∙∙∙O and N−H∙∙∙O to form a three-dimensional network with the π–π interaction between the Bipy molecules. The compound begins to lose water at ~50°С and is completely dehydrated above 200°С.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ma, Xiaozhou, Suturina, Elizaveta A., Rouzieres, Mathieu, Platunov M. S., Wilhelm, Fabrice, Rogalev, Andrei, Clerac, Rodolphe, Dechambenoit, Pierre
Заглавие : Using Redox-Active pi Bridging Ligand as a Control Switch of Intramolecular Magnetic Interactions
Коллективы : ANRFrench National Research Agency (ANR) [ANR-16-CE29-0001-01]; University of Bordeaux; Region Nouvelle Aquitaine; CNRSCentre National de la Recherche Scientifique (CNRS); MOLSPIN COST actionEuropean Cooperation in Science and Technology (COST) [CA15128]; Chinese Scholarship Council (CSC)China Scholarship Council; EPSRCEngineering & Physical Sciences Research Council (EPSRC) [EP/N006895/1]; IRIDIS High Performance Computing Facility; University of Southampton; RSC
Место публикации : J. Am. Chem. Soc. - 2019. - Vol. 141, Is. 19. - P.7721-7725. - ISSN 0002-7863, DOI 10.1021/jacs.9b03044
Примечания : Cited References: 38. - This work was supported by the ANR (ANR-16-CE29-0001-01, Active-Magnet project), the University of Bordeaux, the Region Nouvelle Aquitaine, the CNRS, the MOLSPIN COST action CA15128 and the Chinese Scholarship Council (CSC) for the PhD funding of X.M. E.A.S. thanks EPSRC for support (EP/N006895/1), the IRIDIS High Performance Computing Facility and associated services at the University of Southampton and RSC for travel grant. The authors thank also S. De, D. Woodruff, P. Perlepe, I. Oyarzabal, and S. Exiga for their assistance and fruitful discussions as well as the GdR MCM-2.
Предметные рубрики: GROUND-STATE
COMPLEXES
Аннотация: Intramolecular magnetic interactions in the dinuclear complexes [(tpy)Ni(tphz)Ni(tpy)]n+ (n = 4, 3, and 2; tpy, terpyridine; tphz, tetrapyridophenazine) were tailored by changing the oxidation state of the pyrazine-based bridging ligand. While its neutral form mediates a weak antiferromagnetic (AF) coupling between the two S = 1 Ni(II), its reduced form, tphz•–, promotes a remarkably large ferromagnetic exchange of +214(5) K with Ni(II) spins. Reducing twice the bridging ligand affords weak Ni–Ni interactions, in marked contrast to the Co(II) analogue. Those experimental results, supported by a careful examination of the involved orbitals, provide a clear understanding of the factors which govern strength and sign of the magnetic exchange through an aromatic bridging ligand, a prerequisite for the rational design of strongly coupled molecular systems and high TC molecule-based magnets.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kononova O. N., Duba E. V., Medovikov D. V., Krylov A. S.
Заглавие : Ion-exchange sorption of palladium(II) from hydrochloric acid solutions in the presence of silver(I)
Место публикации : Russ. J. Phys. Chem. A. - 2018. - Vol. 92, Is. 10. - P.2053-2059. - ISSN 0036-0244, DOI 10.1134/S0036024418100138. - ISSN 1531-863X(eISSN)
Примечания : Cited References: 36
Предметные рубрики: PLATINUM-GROUP METALS
RECOVERY
COMPLEXES
CHLORIDE
PD(II)
Ключевые слова (''Своб.индексиров.''): palladium--silver--hydrochloric acid solutions--sorption--sorptive extraction
Аннотация: The sorptive extraction of palladium(II) chloride complexes in the presence of silver(I) chloride complexes from 2 and 4 M aqueous solutions of HCl with a series of Purolite anionites with different functional groups is studied. An anion exchange mechanism of sorption is identified from Raman spectroscopy data. Kinetic properties that are inherent to the investigated ionites and allow the elution of palladium(II) and silver(I) after their extraction in a dynamic mode are revealed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Verpekin V. V., Vasiliev A. D., Kondrasenko A. A., Burmakina G. V., Chudin O. S., Pavlenko N. I, Zimonin, Dmitry V., Rubaylo, Anatoly I.
Заглавие : Chemistry of vinylidene complexes. XXIV. A new μ-vinylidene complex containing RePt core, and platinum-bound carbonyl ligand. Spectroscopic, structural and electrochemical study
Коллективы : Russian Academy of Sciences [V.44.1.7]; Krasnoyarsk Region Science and Technology Support Fund [3/15]
Место публикации : J. Mol. Struct. - 2018. - Vol. 1163. - P.308-315. - ISSN 0022-2860, DOI 10.1016/j.molstruc.2018.03.020. - ISSN 1872-8014(eISSN)
Примечания : Cited References: 45. - The reported study was funded by the State budget allocated to the fundamental research in the Russian Academy of Sciences in the framework of Project No. V.44.1.7 and was financially supported by Krasnoyarsk Region Science and Technology Support Fund (the junior scientists project no. 3/15).
Предметные рубрики: TRI-METAL COMPLEXES
RAY CRYSTAL-STRUCTURE
BRIDGING CARBENE
CARBYNE
Ключевые слова (''Своб.индексиров.''): rhenium--platinum--vinylidene complexes--heterometallic complexes--electrochemistry
Аннотация: The novel heterobinuclear μ-vinylidene complex [Cp(CO)2Re(μ-C=CHPh)Pt(PPh3)(CO)] (1) was isolated from the reaction mixture of [Cp(CO)2Re(μ-C=CHPh)Fe(CO)4] and Pt(PPh3)4 for the first time. Alternative high-yield synthetic approaches to 1 were developed including the reactions of [Cp(CO)2Re(μ-C=CHPh)Pt(PPh3)2] (2) with Co2(CO)8 and Rh(acac)(CO)2. The complex was characterized by IR and ¹H, ¹³C and ³¹P NMR spectroscopy, a molecular structure of 1 was determined by X-ray diffraction analysis. The electrochemical behavior of the new complex was studied by cyclic voltammetry at platinum or glassed carbon electrodes and by dc polarography at a dropping mercury electrode.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Sterkhova I. V., Lesnikov M. K.
Заглавие : Two novel mixed-ligand Ni(II) and Co(II) complexes with 1,10-phenanthroline: Synthesis, structural characterization, and thermal stability
Место публикации : Chem. Phys. Lett. - 2018. - Vol. 708. - P.11-16. - ISSN 00092614 (ISSN), DOI 10.1016/j.cplett.2018.07.058
Примечания : Cited References: 29. - The study was carried out within the public task of the Ministry of Education and Science of the Russian Federation to the Siberian Federal University (4.7666.2017/BP) in 2017-2019. X-ray data from single crystals were obtained with use the analytical equipment of Baikal Center of collective use of SB RAS and with use the analytical equipment of Krasnoyarsk Center of collective use of SB RAS.
Ключевые слова (''Своб.индексиров.''): barbituric acid--1,10-phenanthroline complexes--x-ray diffraction--thermal decomposition--infrared spectroscopy
Аннотация: Two nickel(II) and cobalt(II) complexes with phenanthroline, [Ni(Phen)(H2O)3Br]Br (1) and [Co(Phen)2(H2O)2](Hba)2·2H2O (2), Phen = 1,10-phenanthroline and Hba− = barbiturate anion, were synthesized and characterized by powder XRD, TGA and FT-IR. Their structures were determined by single crystal X-ray diffraction techniques. The Ni2+ ion is coordinated by two N atoms of Phen molecule, Br− ion and three H2O molecules forming an octahedron. Uncoordinated and coordinated Br− ions are connected with water molecules by OH⋯Br intermolecular hydrogen bonds with the formation of a 2D plane network which is extended into a 3D network by π−π stacking interactions. The [Co(Phen)2(H2O)2]2+ cation contains a six-coordinated cobalt atom chelated by two Phen ligands and two aqua ligands in the cis arrangement. NH⋯O, OH⋯O and CH⋯O intermolecular hydrogen bonds form a 3D net. NH⋯O hydrogen bonds form the infinite chains of Hba–. In addition, coordinated Phen molecules and lattice water molecules are linked via CH⋯OW hydrogen bonds to form infinite zigzag chains. These different chains are connected by OWH⋯O hydrogen bonds. π−π interaction plays an important role in the stabilization of structures 1–2. FT-IR, TGA, the diffuse reflectance, and UV–Vis spectra were also used to characterize these compounds.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Верпекин, Виктор Васильевич, Васильев, Александр Дмитриевич, Павленко, Нина Ивановна, Зимонин, Дмитрий Валерьевич, Бурмакина, Галина Вениаминовна
Заглавие : Реакции фенилацетиленидных комплексов золота (i) и фенилвинилиденов марганца и рения
Коллективы : Полифункциональные химические материалы и технологии, Томский государственный университет
Место публикации : Полифункциональные химические материалы и технологии: матер. междунар. науч. конф. : в 2-х т. - 2019. - Т. 1. - С. 172-173. - ISBN 978-5-6042143-9-8
Примечания : Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда науки в рамках научного проекта «Новые соединения на основе золота и благородных металлов: синтез, физико-химические свойства, каталитическая способность» (грант №18-43-240010)
Аннотация: A reactivity of gold phenylacetylides (L)Au-C=C-Ph (L = SMe2, C4H8S, C5H5N) towards the vinylidene complexes of rhenium and manganese containing a metallaallene system M=C=C are studied for the first time.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lupu, Loredana, Wiegand, Pascal, Huttmann N., Rawer, Stephan, Kleinekofort, Wolfgang, Shugureva, Irina, Kichkailo, Anna S., Tomilin F. N., Lazarev, Alexander, Berezovski, Maxim V., Przybylski, Michael
Заглавие : Molecular epitope determination of aptamer complexes of the multidomain protein C-met by proteolytic affinity-mass spectrometry
Коллективы : LOEWE-3 Funding Agency, Hessen-Agentur, Wiesbaden, Germany [696/19-16]
Место публикации : ChemMedChem. - 2020. - Vol. 15, Is. 4. - P.363-369. - ISSN 1860-7179, DOI 10.1002/cmdc.201900489. - ISSN 1860-7187(eISSN)
Примечания : Cited References: 40. - We gratefully acknowledge the advice and assistance of Prof. Friedemann Volklein and Oliver Muller, MSc in the preparation of chips for the SPR affinity determinations. We thank Dr. Stefan Maeser, Biogen GmbH, Munchen, for valuable advice and critical reading of the manuscript. This work has been partially funded (Chip-MS epitope analysis) by the LOEWE-3 Funding Agency, Hessen-Agentur, Wiesbaden, Germany; Grant 696/19-16
Предметные рубрики: DNA APTAMERS
ANTIBODIES
RECOGNITION
Аннотация: C‐Met protein is a glycosylated receptor tyrosine kinase of the hepatocyte growth factor (HGF), composed of an α and a β chain. Upon ligand binding, C‐Met transmits intracellular signals by a unique multi‐substrate docking site. C‐Met can be aberrantly activated leading to tumorigenesis and other diseases, and has been recognized as a biomarker in cancer diagnosis. C‐Met aptamers have been recently considered a useful tool for detection of cancer biomarkers. Herein we report a molecular interaction study of human C‐Met expressed in kidney cells with two DNA aptamers of 60 and 64 bases (CLN0003 and CLN0004), obtained using the SELEX (Systematic Evolution of Ligands by Exponential Enrichment) procedure. Epitope peptides of aptamer‐C‐Met complexes were identified by proteolytic affinity‐mass spectrometry in combination with SPR biosensor analysis (PROTEX‐SPR‐MS), using high‐pressure proteolysis for efficient digestion. High affinities (KD, 80–510 nM) were determined for aptamer‐C‐Met complexes, with two‐step binding suggested by kinetic analysis. A linear epitope, C‐Met (381–393) was identified for CLN0004, while the CLN0003 aptamer revealed an assembled epitope comprised of two peptide sequences, C‐Met (524–543) and C‐Met (557–568). Structure modeling of C‐Met‐aptamers were consistent with the identified epitopes. Specificities and affinities were ascertained by SPR analysis of the synthetic epitope peptides. The high affinities of aptamers to C‐Met, and the specific epitopes revealed render them of high interest for cellular diagnostic studies.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chudin O. S., Verpekin V. V., Kondrasenko A. A., Burmakina G. V., Piryazev D. A., Vasiliev A. D., Pavlenko N. I., Zimonin D. V., Rubaylo A. I.
Заглавие : Chemistry of vinylidene complexes. XXV. Synthesis and reactions of binuclear µ-vinylidene RePt complexes containing phosphite ligands. Spectroscopic, structural and electrochemical study
Место публикации : Inorg. Chim. Acta. - 2020. - Vol. 505. - Ст.119463. - ISSN 00201693 (ISSN), DOI 10.1016/j.ica.2020.119463
Примечания : Cited References: 56. - This work was conducted within the framework of the budget project AAAA-A17-117021310221-7 for Institute of Chemistry and Chemical Technology SB RAS using the equipment of Krasnoyarsk Regional Research Equipment Centre of SB RAS
Аннотация: Reactions of Cp(CO)2ReCCHPh with Pt[P(OR)3]4 (R = Pri, Et, Ph) gave binuclear μ-vinylidene complexes Cp(CO)2RePt(μ-CCHPh)[P(OR)3]2. Treatment of the previously synthesized Cp(CO)2Re(μ-CCHPh)Pt(PPh3)2 with triisopropylphosphite or triethylphosphite resulted in a stepwise substitution of PPh3 ligands, leading to the disubstituted Cp(CO)2RePt(μ-CCHPh)[P(OR)3]2 and monosubstituted Cp(CO)2RePt(μ-CCHPh)[P(OR)3](PPh3) (R = Pri or Et) species, while no triphenylphosphine ligand substitution in the reaction with P(OPh)3 occurs at all. The monosubstituted Cp(CO)2RePt(μ-CCHPh)[P(OR)3](PPh3) (R = Pri, Et, Ph) species were also obtained by reacting Cp(CO)2ReCCHPh with mixed-ligand complexes Pt(PPh3)3L (L = P(OPri)3, P(OEt)3, P(OPh)3). Reactions of Cp(CO)2RePt(μ-CCHPh)LL′ (L = L′ = P(OPri)3, P(OEt)3, P(OPh)3; L = P(OPri)3, P(OEt)3, P(OPh)3, L′ = PPh3) with Co2(CO)9 yield tricarbonyl vinylidene species Cp(CO)2RePt(μ-CCHPh)[P(OR)3](CO) (R = Pri, Et, Ph). The obtained compounds were characterized by IR and 1H, 13C, 31P NMR spectroscopy. The molecular structures of Cp(CO)2RePt(μ-CCHPh)[P(OPri)3]2, Cp(CO)2RePt(μ-CCHPh)[P(OPri)3](PPh3) and Cp(CO)2RePt(μ-CCHPh)[P(OPri)3](CO) were determined by X-ray diffraction study. The redox properties of the new complexes and their reactions of chemical oxidation were studied.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Vorotynov A. M., Velikanov D. A., Shiyan Ya. G., Ovcharenko V. I., Ikorskii V. N., Romanenko G. V., Fursova E. Yu., Shimchak R.
Заглавие : Magnetic resonance in Cu(hfac)2LR heterospin chain polymer complexes
Место публикации : J. Struct. Chem. - 2006. - Vol. 47, Is. 3. - P.447-452. - ISSN 0022-4766, DOI 10.1007/s10947-006-0321-9
Примечания : Cited References: 4
Аннотация: Cu(hfac)2 chain polymer heterospin complexes with pyrazole-substituted nitronylnitroxides (LR, where R = Me, Et) with a composition Cu(hfac)2LR, exhibiting structural rearrangements with magnetic effects in the solid state at reduced temperatures, were studied by magnetic resonance. The magnetic resonance spectrum changes substantially for substituents of different types. The results of this study are discussed in the context of the cluster approach in view of the specific crystal structure of the compounds.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Верпекин, Виктор Васильевич, Васильев, Александр Дмитриевич, Павленко, Нина Ивановна, Семейкин О. В., Крейндлин А. З.
Заглавие : Синтез алкинильных комплексов циклопентадиенилдикарконил железа в условиях реакций pd/cu-катализируемого m-c сочетания
Коллективы : Полифункциональные химические материалы и технологии, Томский государственный университет
Место публикации : Полифункциональные химические материалы и технологии: матер. междунар. науч. конф. : в 2-х т. - 2019. - Т. 1. - С. 174-175. - ISBN 978-5-6042143-9-8
Примечания : Исследование выполнено за счет гранта Российского научного фонда (проект № 18-73-00150)
Аннотация: Reactions between cyclopentadienyliron dicarbonyl iodide and terminal alkynes containing such substituents as ortho-, meta-, para-pyrydyl, 2-thiophenyl, 2,1,3-benzothiadiazole in condition of Pd/Cu-catalyzed cross-coupling are studied. New synthetic methods for о-alkynyl iron complexes are developed.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smolyarov K. T., Volkov N. V., Matsulev A. N., Kondrasenko A. A.
Заглавие : The comparative analysis of the solid-state 31P NMR spectra of Re-Pt vinylidene complexes
Коллективы : International Scientific Conference "Conference on Applied Physics, Information Technologies and Engineering"
Место публикации : J. Phys. Conf. Ser. - 2019. - Vol. 1399. - Ст.022028. - ISSN 1742-6588, DOI 10.1088/1742-6596/1399/2/022028. - ISSN 1742-6596 (eISSN)
Примечания : Cited References: 11
Предметные рубрики: Applied Physics
Аннотация: The two vinylidene complexes Cp(CO)2 RePt(μ-C=CHPh)(PPh3 )(CO) and Cp(CO)2 RePt(μ-C=CHPh)(PPh3 )2 and their precursors PPh3 and P(PPh3 )4 were studied by solid-state nuclear magnetic resonance. We analysed 31P cross-polarization spectra acquired in static conditions and with magic angle spinning. The chemical shift tensors of each sample were determined by fitting their spectra using SIMPSON simulations.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Головнев, Николай Николаевич, Молокеев, Максим Сергеевич, Лесников, Максим Кириллович
Заглавие : Строение гидратов комплексов металлов с барбитуровыми кислотами
Место публикации : Журн. СФУ. Химия. - 2017. - Т. 10, № 3. - С. 401-415. - ISSN 1998-2836, DOI 10.17516/1998-2836-0036; J. Sib. Fed. Univ. Chem. - ISSN 2313-6049
Примечания : Библиогр.: 20. - Работа выполнена в рамках государственного задания Минобрнауки РФ Сибирскому федеральному университету в 2017-2019 гг. (4.7666.2017/БЧ).
Ключевые слова (''Своб.индексиров.''): барбитуровые кислоты--ионы металлов--комплексы--гидраты--структура--barbituric acids--metal ions--complexes--hydrates--structure
Аннотация: Обобщены данные о синтезе и структуре комплексов металлов с барбитуровой (H2ba), тиобарбитуровой (H2tba) и 1,3-диэтил-2-тиобарбитуровой (HDetba) кислотами, в состав которых входит различное количество координированных молекул воды. В зависимости от условий из водного раствора кристаллизуются соединения состава [M(H2O)n−kLm]0∙pH2O (Mm+ – ион металла; L− = Hba−, Htba− и Detba−; k≥0, p≥0). Образование нейтральных комплексов [M(H2O)n−kLm]0∙pH2O, содержащих разное количество координированных молекул воды (n−k), имеет место в случае лигандов L− с потенциально разной дентатностью и/или с мостиковым способом координации. Кристаллизация нескольких гидратов [M(H2O)n−kLm]0∙pH2O также ожидается, если в них молекулы воды могут быть как концевыми, так и мостиковыми лигандами, а центральные ионы, например, щелочноземельных металлов, легко образуют разные координационные полиэдры. Синтез новых гидратов может существенно расширить круг доступных соединений, в том числе и с потенциально полезными функциональными свойствами.Data on the synthesis and structure of metal complexes with barbituric (H2ba), thiobarbituric (H2tba) and 1,3-diethyl-2-thiobarbituric (HDetba) acids, which include a different number of coordinated water molecules, are summarized. Depending on the conditions, compounds of the composition [M(H2O)n−kLm]0∙pH2O (Mm+ – metal ion; L− = Hba−, Htba− и Detba−; k≥0, p≥0) crystallize from the aqueous solution. The formation of neutral complexes of [M(H2O)n−kLm]0∙pH2O containing different amounts of coordinated water molecules (n-k) occurs in the case of L− ligands with potentially different dentateness and/or bridging coordination. Crystallization of several hydrates [M(H2O)n−kLm]0∙pH2O is also expected if water molecules can be both terminal and bridged ligands in them, and central ions, for example, of alkaline earth metals, easily form different coordination polyhedra. Synthesis of new hydrates can significantly expand the range of available compounds, including potentially useful functional properties.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasilchenko D., Vorob'eva S., Tkachev S., Baidina I. A., Belyaev A., Korenev S., Solovyov L., Vasiliev A. D.
Заглавие : Rhodium(III) speciation in concentrated nitric acid solutions
Коллективы : Russian Foundation for Basic Research [16-03-00549 A]; Ministry for Education and Science of the Russian Federation
Место публикации : Eur. J. Inorg. Chem.: Wiley-VCH Verlag, 2016. - Vol. 2016, Is. 23. - P.3822-3828. - ISSN 1434-1948, DOI 10.1002/ejic.201600523. - ISSN 1099-0682(eISSN)
Примечания : Cited References:31. - This work was supported by the Russian Foundation for Basic Research (grant number 16-03-00549 A). D. V. thanks the Ministry for Education and Science of the Russian Federation for the award of a President of the Russian Federation for Young Scientists Fellowship.
Предметные рубрики: MAGNETIC-RESONANCE
FISSION PLATINOIDS
AQUEOUS-SOLUTIONS
PT-195 NMR
RH(III)
SPECTROSCOPY
CHEMISTRY
DISSOCIATION
PLATINUM(IV)
COMPLEXES
Ключевые слова (''Своб.индексиров.''): rhodium--nmr spectroscopy--nitrates
Аннотация: The interaction of rhodium(III) aqua ions with nitrate ions in 3–16 m nitric acid solutions has been studied by 103Rh and 15N NMR and Raman spectroscopy. The mononuclear complexes [Rh(H2O)6–n(NO3)n]3–n (n = 1–4) were found to be the only form of rhodium(III) existing in the solutions with the metal concentration in the range 0.2–1.3 m. The dynamics of the H2O → NO3– substitution process was studied at 80 °C. An increase in the average number of nitrate groups bonded to rhodium with increasing concentration of nitric acid was also determined. The fine crystalline salt Rb4trans-[Rh(H2O)2(NO3)4][Rh(NO3)6] was obtained by solvothermal concentration of the rhodium nitric acid solution on addition of rubidium nitrate. The structure of the salt was solved by the powder X-ray diffraction method, with monodentate coordination of nitrato ligands found for both the [Rh(NO3)6]3– and trans-[Rh(H2O)2(NO3)4]– anions.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Sterkhova, Irina V., Atuchin V. V., Sidorenko, Maxim Y.
Заглавие : Hydrates [Na2(H2O)x](2-thiobarbiturate)2 (x = 3, 4, 5): crystal structure, spectroscopic and thermal properties
Коллективы : Ministry of Education and Science of the Russian Federation [3049]
Место публикации : J. Coord. Chem.: Taylor & Francis, 2016. - Vol. 69, Is. 21. - P.3219-3230. - ISSN 0095-8972, DOI 10.1080/00958972.2016.1228914. - ISSN 1029-0389(eISSN)
Примечания : Cited References:33. - This work was supported by the the Ministry of Education and Science of the Russian Federation for research engineering of the Siberian Federal University [grant number 3049].
Предметные рубрики: 2-THIOBARBITURIC ACID
COMPLEXES
1,3-DIETHYL-2-THIOBARBITURATE
TRANSFORMATION
CESIUM
Na
Li
Ключевые слова (''Своб.индексиров.''): 2-thiobarbituric acid--sodium--coordination compound--x-ray diffraction--infrared spectroscopy--thermal analysis
Аннотация: The hydrates [Na2(H2O)3(Htba)2] (1) and [Na2(H2O)4(Htba)2] (2), where H2tba is 2-thiobarbituric acid, were obtained under different thermal conditions from aqueous solutions and were structurally characterized. The molecular and supramolecular structures were compared to the known structure of [Na2(H2O)5(Htba)2] (3). In polymeric 1–3, the Htba− ions are linked to Na+ through O and S forming octahedra. The decrease of the number of coordination water molecules led to an increase of the total number of bridge ligands (μ2-H2O, Htba−) and a change of the Htba− coordination. These factors induced higher distortion of the octahedra. It was assumed that hydrates, with a different number of coordinated water molecules, are more probable when the central metal has weaker bonds with O water molecules and with other ligands. The net topologies of 1–3 were compared. Thermal decomposition and IR spectra were analyzed for 1 and 2.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Samoilo A. S., Atuchin V. V.
Заглавие : Influence of alkyl substituents in 1,3-diethyl-2-thiobarbituric acid on the coordination environment in M(H2O)2(1,3-diethyl-2-thiobarbiturate)2 M = Ca2+, Sr2+
Место публикации : J. Coord. Chem.: Taylor & Francis, 2016. - Vol. 69, Is. 6. - P.957-965. - ISSN 00958972 (ISSN), DOI 10.1080/00958972.2016.1149168
Примечания : Cited References: 42. - The study was carried out within the public task of the Ministry of Education and Science of the Russian Federation for research engineering of the Siberian Federal University in 2015-2016. V.V.A. is grateful to the Ministry of Education and Science of the Russian Federation for the financial support of the investigation.
Предметные рубрики: CRYSTAL-STRUCTURE
2-THIOBARBITURIC ACID
STRUCTURAL-CHARACTERIZATION
THIOBARBITURIC ACID
THERMAL-PROPERTIES
HYDROGEN-BOND
COMPLEXES
DIFFRACTION
NETWORKS
POLYMERS
Ключевые слова (''Своб.индексиров.''): 1,3-diethyl-2-thiobarbituric acid--alkaline earth metals--coordination compound--x-ray diffraction--thermal analysis
Аннотация: Two new isostructural complexes, [Ca(H2O)2(μ2-Detba-O,O′)2]n (1) and [Sr(H2O)2(μ2-Detba-O,O′)2]n (2) (HDetba = 1,3-diethyl-2-thiobarbituric acid), were synthesized and characterized by single-crystal and powder X-ray diffraction analysis, TG-DSC, FT-IR, and emission spectroscopy. The single-crystal X-ray diffraction data revealed that 1 and 2 are polymeric where M2+ (M = Ca, Sr) is a six-coordinate octahedral binding four Detba− ions and two water molecules. The octahedra are linked through bridging Detba− ions forming a 2-D layer. Two intermolecular hydrogen bonds O–H…S in the crystal form a 3-D net. The comparison of M(Detba)2 and M(Htba)2 (H2tba = 2-thiobarbituric acid) structures showed that the coordination number of metals in M(Detba)2 does not exceed six and there are no π–π interactions, unlike compounds with Htba−; Detba− ions are only bridges in HDetba coordination compounds. Thermal decomposition of 1 and 2 includes dehydration, which mainly ends at 200 °C, and organic ligand oxidation at 300–350 °C with a release of CO2, SO2, H2O, NH3, and isocyanate. Upon excitation at 220 nm, 1 and 2 exhibit an intense emission maximum at 557 nm.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Krasnov P. O., Kozhevnikov T. A., Popov M. A.
Заглавие : Calculation of the energy of binding of titanium and scandium complexes to the surface of carbon nanotubes
Коллективы : Analytical departmental program "Development of Higher Education Potential" [2.1.1/2584]; Russian Foundation for Basic Research [09-02-00324-a]
Место публикации : Russ. J. Phys. Chem. B. - 2009. - Vol. 3, Is. 4. - P.679-683. - ISSN 1990-7931, DOI 10.1134/S1990793109040289
Примечания : Cited References: 27. - This work was supported by the analytical departmental program "Development of Higher Education Potential (2009-2100)" (grant 2.1.1/2584) and by the Russian Foundation for Basic Research, project no. 09-02-00324-a.
Предметные рубрики: MOLECULAR-HYDROGEN COMPLEXES
STORAGE
TEMPERATURE
TRANSITION
DYNAMICS
METALS
Аннотация: Complexes of zigzag-type carbon nanotubes (CNTs) with transition metal atoms, scandium and titanium, were studied. It was demonstrated that the energy of binding of both atoms with a carbon surface decreases whereas the rate of diffusion along the surface increases with increasing nanotube diameter. The rate constant of migration of scandium atoms over a CNT surface are several orders of magnitude higher than that for titanium atoms, because the CNT surface-Sc atom binding energy is substantially lower.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : MALAKHOVSKII A. V., VASILIEV G. G.
Заглавие : COVALENCY EFFECT IN A D-D TRANSITION IN OCTAHEDROL COMPLEXES
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1982. - Vol. 24, Is. 2. - P585-588. - ISSN 0367-3294
Примечания : Cited References: 12
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sobol A. A., Shukshin V. E., Zaitsev A. I.
Заглавие : Raman spectroscopy of crystalline, glassy, and molten states of lead diborate
Место публикации : Opt. Spectrosc: Maik Nauka-Interperiodica Publishing, 2016. - Vol. 121, Is. 6. - P.810-818. - ISSN 0030400X (ISSN), DOI 10.1134/S0030400X16120249
Примечания : Cited References: 30. - This work was performed with financial support from RFBR, research project no. 13-02-00707.
Ключевые слова (''Своб.индексиров.''): boron--crystalline materials--raman scattering--single crystals--internal vibration--molten state--oxygen complexes--phonon lines--polarized raman spectra--glass
Аннотация: Polarized Raman spectra of single crystals of lead diborate, PbB4O7 (PBO), are studied in detail at 300 K. The TO-, LO-, and IO-phonon lines of the A1, A2, B1, and B2 symmetries in the Raman spectra of this compound are assigned. Changes in the Raman spectra of the internal vibrations of boron–oxygen complexes upon transition from the crystalline to the glassy and the molten states of PBO are observed. On the basis of the obtained results, the regularities in the formation of boron–oxygen complexes in glasses, melts, and crystals of the PbO · 2B2O3, SrO · 2B2O3, and Li2O · 2B2O3. diborate compositions are analyzed. © 2016, Pleiades Publishing, Ltd.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golovnev N. N., Molokeev M. S., Lesnikov M. K., Vereshchagin S. N.
Заглавие : Polymeric lithium(I) diaquabarbiturate: Crystal structure
Коллективы : Ministry of Education and Science of the Russian Federation [3049]
Место публикации : Russ. J. Inorg. Chem.: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 62, Is. 6. - P.746-750. - ISSN 0036-0236, DOI 10.1134/S0036023617060092. - ISSN 1531-8613(eISSN)
Примечания : Cited References:23. - This work was performed in the Siberian Federal University within the State task of the Ministry of Education and Science of the Russian Federation for the period of 2014-2016 (project no. 3049).
Предметные рубрики: IONIC CO-CRYSTALS
BARBITURIC-ACID
COMPLEXES
NA
LI
Аннотация: The lithium(I) catena-diaquabarbiturate complex [Li(H2O)2(HBA–O,O′)]n (I), where Н2ВА is barbituric acid, has been structurally characterized by X-ray diffraction (CIF file CCDC no. 1447689), and its thermal decomposition and IR spectrum have been studied. Crystals of complex I are monoclinic, a = 6.4306(7) Å, b = 16.720(1) Å, c = 7.1732(8) Å, β = 108.253(4)°, V = 732.5(1) Å3, space group P21/c, and Z = 4. One independent μ2-bridging HBA– ligand is coordinated to two Li(I) ions via the two oxygen atoms of C4(6)=O carbonyl groups. Each Li+ ion is linked with two μ2-HBA– ions and two terminal water molecules at tetrahedron vertices. μ2-HBA– ions link tetrahedra into a chain. The structure is stabilized by multiple hydrogen bonds and π–π-interaction between HBA–. The shift of ν(C=O) vibration bands in the IR spectrum of complex I in comparison with Н2ВА towards lower frequencies agrees with the coordination of HBA– via oxygen atoms. The dehydration of complex I occurs in two stages in the regions of 100–150 and 150–240°C.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kononova O. N., Duba E. V., Medovikov D. V., Efimova A. S., Ivanov A. I., Krylov A. S.
Заглавие : Ion-exchange sorption of silver(I) chloride complexes from aqueous HCl solutions
Место публикации : Russ. J. Phys. Chem. A. - 2017. - Vol. 91, Is. 12. - P.2383-2388. - ISSN 00360244 (ISSN), DOI 10.1134/S0036024417120135
Примечания : Cited References: 31
Ключевые слова (''Своб.индексиров.''): silver--anionites--hydrochloric acid solutions--sorption
Аннотация: The ion-exchange sorption of silver(I) chloride complexes from 1–4 M aqueous solutions of HCl on a series of Purolite anionites with various functional groups was studied. The ion-exchange equilibria in the systems were found to be anomalous according to Raman spectroscopy, which does not significantly affect the sorption properties of the ionites.
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