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High-temperature heat capacity of the BiFeO3 multiferroic / V. M. Denisov [et al.] // Phys. Solid State. - 2012. - Vol. 54, Is. 6. - P. 1312-1314, DOI 10.1134/S1063783412060108. - Cited References: 27 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
STRUCTURAL-CHARACTERIZATION
   SINGLE-CRYSTALS
   FEATURES
   SYSTEM
   RANGE
Аннотация: Data on the heat capacity of the BiFeO3 multiferroic have been obtained within a broad temperature interval. Correlation has been established between the composition of the Bi2O3-Fe2O3 pseudobinary system and the specific heat capacity of the oxide compounds.

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Публикация на русском языке Высокотемпературная теплоемкость мультиферроика BiFeO3 // Физика твердого тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54, N 6. - С. 1234-1236. - ISSN 0367-3294

Держатели документа:
[Denisov, V. M.
Irtyugo, L. A.
Denisova, L. T.] Siberian Fed Univ, Inst Nonferrous Met & Mat Sci, Krasnoyarsk 660025, Russia
[Volkov, N. V.
Patrin, G. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Volkov, N. V.
Patrin, G. S.] Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Denisov, V. M.; Денисов, Виктор Михайлович; Volkov, N. V.; Волков, Никита Валентинович; Irtyugo, L. A.; Patrin, G. S.; Патрин, Геннадий Семёнович; Denisova, L. T.
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    The cis-trans isomer transformation, spectroscopic and thermal properties of Li, Na, K 1,3-diethyl-2-thiobarbiturate complexes / N. N. Golovnev [et al.] // Polyhedron. - 2015. - Vol. 85. - P. 493-498, DOI 10.1016/j.poly.2014.09.011. - Cited References:42. - The study has been carried out within the public task of the Ministry ofEducation and Science of the Russian Federation for research engineeringat the Siberian Federal University in 2014. V.V.A. is partly supportedby the Ministry of Education and Science of the Russian Federation. . - ISSN 0277-5387
   Перевод заглавия: Трансформация цис-транс изомеров, спектроскопические и термические свойства Li, Na, K 1,3-диэтил-2-тиобарбитуратных комплексов

РУБ Chemistry, Inorganic & Nuclear + Crystallography
Рубрики:
CRYSTAL-STRUCTURE
   2-THIOBARBITURIC ACID
   STRUCTURAL-CHARACTERIZATION
   HYDROGEN-BOND
   DIFFRACTION
   THIOBARBITURATE
   CHEMISTRY
   NETWORKS
   SPECTRA
   SERIES
Кл.слова (ненормированные):
1,3-Diethyl-2-thiobarbituric acid -- Alkali ions -- X-ray diffraction -- Infrared spectroscopy -- Thermal analysis
Аннотация: Three new complexes of 1,3-diethyl-2-thiobarbituric acid (C8H11N2O2S, HDETBA) with Li+, Na+, K+ alkali ions were synthesized. The complexes have been prepared by neutralization of 1,3-diethyl-2-thiobarbituric acid with the corresponding metal hydroxide in aqueous solution. The colorless crystals have been investigated using X-ray single crystal and powder techniques and characterized by differential scanning calorimetry, thermogravimetry and infrared spectroscopy. The compounds of MDETBA with M = Li and M = Na crystallize in the monoclinic lattice with a = 10.678(1) Å, b = 7.2687(9) Å, c = 13.202(2) Å, β = 108.841(2)°, Z = 4, V = 969.8(2) Å3, S.G. P21/n and a = 10.534(2) Å, b = 7.604(1) Å, c = 14.186(1) Å, β = 108.964(4)°, Z = 4, V = 1074.6(3) Å3, S.G. P21/n, respectively. Сompound KDETBA crystallizes in the orthorhombic lattice with a = 4.2541(6) Å, b = 14.739(2) Å, c = 16.635(3) Å, Z = 4, V = 1043.1(3) Å3, S.G. P212121. In Li(I) and Na(I) complexes, the DETBA− ion is in cis-configuration and, in the K(I) complex, this ion is in trans-configuration. The reason for the transformation from cis- to trans-configuration has been rationalized.

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Держатели документа:
Siberian Fed Univ, Dept Chem, Krasnoyarsk 660041, Russia
SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia
SB RAS, Inst Chem & Chem Technol, Lab Catalyt Convers Small Mol, Krasnoyarsk 660036, Russia
SB RAS, Irkutsk Favorsky Inst Chem, Phys Chem Lab, Irkutsk 664033, Russia
Inst Semicond Phys, Lab Opt Mat & Struct, Novosibirsk 630090, Russia
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia

Доп.точки доступа:
Golovnev, N. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Vereshchagin, Sergey N.; Sterkhova, I. V.; Atuchin, V. V.; Ministry of Education and Science of the Russian Federation
}
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    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+ / N. N. Golovnev [et al.] // J. Coord. Chem. - 2016. - Vol. 69, Is. 6. - P. 957-965, DOI 10.1080/00958972.2016.1149168. - 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. . - ISSN 0095-8972
   Перевод заглавия: Влияние алкильных заместителей в 1,3-диэтил-2-2тиобарбитуровой кислоты на координационное окружение в M(H2O)2(1,3-диэтил-2-тиобарбутурат)2 M = Ca2+, Sr2+

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
CRYSTAL-STRUCTURE
   2-THIOBARBITURIC ACID
   STRUCTURAL-CHARACTERIZATION
   THIOBARBITURIC ACID
   THERMAL-PROPERTIES
   HYDROGEN-BOND
   COMPLEXES
   DIFFRACTION
   NETWORKS
   POLYMERS
Кл.слова (ненормированные):
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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Держатели документа:
Department of Chemistry, Siberian Federal University, Krasnoyarsk, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, Russian Federation
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, Novosibirsk, Russian Federation
Functional Electronics Laboratory, Tomsk State University, Tomsk, Russian Federation
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State University, Novosibirsk, Russian Federation

Доп.точки доступа:
Golovnev, N. N.; Головнёв, Николай Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Samoilo, A. S.; Atuchin, V. V.
}
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