Phase transitions in non-centrosymmetric pyridinium trifluoromethanesulfonate crystal: Vibrational studies.

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy（2015）

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摘要

•Multiple structure of νNH band arises from Fermi resonance.•Internal modes of PyHOTf fulfill selection rules of the factor group in IR spectra.•PyH+ cation and −OTf anion are involved in the order–disorder phase transitions.•PyH+ cation and −OTf anion exhibit rotational mobility at high temperature phases.

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关键词

Pyridinium trifluoromethanesulfonate,Vibrational spectroscopy,Temperature-dependent infrared spectra,Order–disorder phase transition,Ion mobility

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