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Polarized infrared and Raman spectra of low‐frequency vibrations of two phases of crystalline m ‐nitrophenol
Author(s) -
Wójcik G.,
Giermańska J.,
Marqueton Y.,
Ecolivet C.
Publication year - 1991
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250220704
Subject(s) - raman spectroscopy , orthorhombic crystal system , monoclinic crystal system , hydrogen bond , infrared spectroscopy , chemistry , metastability , phase transition , spectral line , infrared , crystal (programming language) , phase (matter) , molecular vibration , analytical chemistry (journal) , materials science , crystal structure , crystallography , molecular physics , optics , molecule , condensed matter physics , programming language , physics , organic chemistry , astronomy , computer science , chromatography
Polarized IR spectra in the 20–400 cm −1 region and Raman spectra in the 0–200 cm −1 region were measured at room and liquid nitrogen temperature for crystals of two phases of m ‐nitrophenol ( m NPh). The Raman spectra of the orthorhombic mNPh crystal were measured as a function of temperature from room temperature up to 360 K for spectroscopic evidence of a phase transition. The symmetries of lattice and low‐frequency internal vibrations are discussed. The influence of decreasing temperature on the bands produced by the hydrogen bridge vibration is presented. The role of the hydrogen bond in the mechanism of the phase transition and the metastability of the monoclinic phase is discussed.