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Zhang F, Wang HW, Tominaga K, Hayashi M. Characteristics of Low-Frequency Molecular Phonon Modes Studied by THz Spectroscopy and Solid-State ab Initio Theory: Polymorphs I and III of Diflunisal. J Phys Chem B 2016; 120:1698-710. [PMID: 26808927 DOI: 10.1021/acs.jpcb.5b08798] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
THz absorption spectra of two polymorphs of diflunisal, form I and form III, exhibit distinct features due to the influence of packing conformations on the frequency distributions and IR activities of gamma point phonon modes within the 100 cm(-1) region. In order to understand the origins of these THz modes, we perform a detailed mode analysis. The result shows that although the spectral features are different, these low-frequency phonon modes of the two molecular polymorphs have similar vibrational characteristics in terms of harmonic couplings of intermolecular and intramolecular vibrations.
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Affiliation(s)
- Feng Zhang
- Molecular Photoscience Research Center, Kobe University , Kobe 657-8501, Japan
| | - Houng-Wei Wang
- Center for Condensed Matter Sciences, National Taiwan University , 1 Roosevelt Road Sec. 4, Taipei 10617, Taiwan
| | - Keisuke Tominaga
- Molecular Photoscience Research Center, Kobe University , Kobe 657-8501, Japan
| | - Michitoshi Hayashi
- Center for Condensed Matter Sciences, National Taiwan University , 1 Roosevelt Road Sec. 4, Taipei 10617, Taiwan
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Affiliation(s)
- K. Kobashi
- a Laboratoire des Interactions Moléculaires et des Hautes Pressions, CNRS, Centre Universitaire Paris Nord , 93430 , Villetaneuse , France
- b Department of Chemistry , Faculty of Science, Kyoto University , Kyoto , Japan , 606
| | - V. Chandrasekharan
- a Laboratoire des Interactions Moléculaires et des Hautes Pressions, CNRS, Centre Universitaire Paris Nord , 93430 , Villetaneuse , France
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Affiliation(s)
- C.S. Murthy
- a Department of Chemistry , Royal Holloway College , Egham , Surrey , TW20 0EX , England
| | - K. Singer
- a Department of Chemistry , Royal Holloway College , Egham , Surrey , TW20 0EX , England
| | - M.L. Klein
- b Division of Chemistry , National Research Council of Canada , Ottawa , Canada , K1A 0R6
| | - I.R. McDonald
- c Department of Physical Chemistry , University of Cambridge , Lensfield Road, Cambridge , CB2 1EP , England
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