Raman spectroscopy studies of the terahertz vibrational modes of a DUT-8 (Ni) metal-organic framework

Alexander Krylov, Alexander Vtyurin, Petko Petkov, Irena Senkovska, Mariia Maliuta, Volodymyr Bon, Thomas Heine, Stefan Kaskel, Evgenia Slyusareva

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Abstract

Low-frequency lattice vibrational modes have been discussed to play a crucial role in the phase transformation process of flexible metal-organic frameworks (MOFs). Therefore, Raman spectroscopy was applied to study the lattice dynamics of a pillared layer DUT-8(Ni) framework (DUT-Dresden University of Technology), existing in rigid and flexible forms. Both the open and the close pore phases could be unambiguously identified by breathing mode bands at 23 cm-1 and 60 cm-1 in the corresponding Raman spectra, showing the efficiency of the technique for monitoring the flexibility of MOF materials as well as the differences in the lattice vibrations of the two phases. Born-Oppenheimer Molecular Dynamics simulations showed that observed low-frequency bands indeed correspond to the oscillation of the breathing mode along the diagonals of the pore channels. Moreover, the directional character of low-frequency vibrations in the flexible version of DUT-8(Ni) could be visualized by the orientation dependent Raman spectroscopy experiment.

Original languageEnglish
Pages (from-to)32099-32104
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number47
DOIs
Publication statusPublished - 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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    Krylov, A., Vtyurin, A., Petkov, P., Senkovska, I., Maliuta, M., Bon, V., Heine, T., Kaskel, S., & Slyusareva, E. (2017). Raman spectroscopy studies of the terahertz vibrational modes of a DUT-8 (Ni) metal-organic framework. Physical Chemistry Chemical Physics, 19(47), 32099-32104. https://doi.org/10.1039/c7cp06225g