Vibrational study of phase transitions in (CH3)3NHNO3

(CH3)3 NHNO3 belongs to the monoclinic system with space group P21/c (C52h ) with four molecules per unit cell. Raman and infrared spectra (10–5000 cm−1) of single crystals and polycrystalline samples of (CH3)3 NHNO3 and of its N-deuterated derivative were investigated in the temperature range 90–41...

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Bibliographic Details
Published in:The Journal of chemical physics 1988-08, Vol.89 (3), p.1634-1641
Main Authors: Mylrajan, M., Srinivasan, T. K. K.
Format: Article
Language:English
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Summary:(CH3)3 NHNO3 belongs to the monoclinic system with space group P21/c (C52h ) with four molecules per unit cell. Raman and infrared spectra (10–5000 cm−1) of single crystals and polycrystalline samples of (CH3)3 NHNO3 and of its N-deuterated derivative were investigated in the temperature range 90–415 K. Assignments of the measured frequencies to the internal vibrational modes were obtained. A systematic temperature dependent study of frequencies, bandwidths and integrated intensities was performed. The results indicate the existence of phase transitions at 359 and 407 K and both phase transitions show thermal hysteresis, characteristic of first order. In the high temperature phases II and I, the cations and anions achieve reorientational motion.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.455160