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    Unfolding the terahertz spectrum of soft porous crystals: rigid unit modes and their impact on phase transitions / A. E.J. Hoffman, I. Senkovska, J. Wieme [et al.] // J. Mater. Chem. A. - 2022. - Vol. 10, Is. 33. - P. 17254-17266, DOI 10.1039/d2ta01678h. - Cited References: 80. - This work was financially supported by the Fund for Scientific Research Flanders (FWO), the Research Board of the Ghent University (BOF), the Deutsche Forschungsgemeinschaft (DFG, project number 448809307), and the Russian Foundation for Basic Research (RFBR, project number 21-52-12018). The authors thank Kerstin Zechel for sample synthesis. The computational resources and services used in this work were provided by the Flemish Supercomputer Center (VSC), funded by FWO and the Flemish Government . - ISSN 2050-7488
Кл.слова (ненормированные):
Calculations -- Crystalline materials -- Lattice vibrations -- Phonons -- Vibration analysis -- Ab initio -- Building blockes -- Dynamics calculations -- Low-frequency phonon -- Metalorganic frameworks (MOFs) -- Phase transition mechanisms -- Porous crystals -- Rigid unit modes -- Terahertz spectrum -- Unfoldings -- Organometallics
Аннотация: Phase transitions in flexible metal-organic frameworks or soft porous crystals are mediated by low-frequency phonons or rigid-unit modes. The alteration of specific building blocks may change the lattice dynamics of these frameworks, which can influence the phase transition mechanism. In this work, the impact of building block substitution on the rigid-unit modes in flexible MIL-53 analogs with a winerack topology will be investigated via ab initio lattice dynamics calculations. First, the accuracy of the theoretical simulations is verified via experimental Raman measurements, which provide unique fingerprint vibrations in the terahertz range to characterize the phase transition. Following analysis of the low-frequency vibrations shows that there exists a set of universal rigid-unit modes inducing translations and/or rotations of the building blocks. The theoretical results demonstrate that linker substitutions have a large effect on the rigid-unit mode frequencies, whereas this is less so for inorganic chain substitutions. These findings may help to rationally tune the phonon frequencies in soft porous crystals.

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Держатели документа:
Center for Molecular Modeling, Ghent University, Technologiepark 46, Zwijnaarde, 9052, Belgium
Inorganic Chemistry I, Technische Universitat Dresden, Bergstra?e 66, Dresden, 01187, Germany
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Hoffman, A. E.J.; Senkovska, I.; Wieme, J.; Krylov, A. S.; Крылов, Александр Сергеевич; Kaskel, S.; Van Speybroeck, V.
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