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Investigation of the structure of polymorphous modifications of fluoroalkylcyclohexane-carboxylic acids by infrared spectroscopy methods
Author(s): Lev M. Babkov; Ekaterina A. Martynova; Galina A. Puchkovska; Alexander Yu. Slepoukhine; E. S. Vedyaeva
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Paper Abstract

The results of investigation of polymorphism and mesomorphic states of fluorinated derivatives of alkylcyclohexanecarboxylic acids nFACHCA and new results for n=4, 7 are discussed. The methods of vibrational spectroscopy have been used. The samples were investgiated in the 290-500 K temperature range. The spectra were recorded in the range of 400-4000 cm-1. The frequencies of normal modes and IR band intensities are calculated for conformers of H-bonded complexes with varioius orientations of fluoroalkyl radical and carboxylic group relative to the rest of the molecular compelx. The polymorphism of the nFACHCA is conformational. The influence of H-bonds on dynamics of H-bonded complex, polymorphic crystalline modification and mesophase formaiton was determined. The transitions solid crystal-liquid crystal-isotropic liquid and soution are accompanied by H-bond system reconstruction: the dimers, associates, chain associates and monomers appear.

Paper Details

Date Published: 11 December 2002
PDF: 5 pages
Proc. SPIE 4938, Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals, (11 December 2002); doi: 10.1117/12.486659
Show Author Affiliations
Lev M. Babkov, Saratov State Univ. (Russia)
Ekaterina A. Martynova, Saratov State Univ. (Russia)
Galina A. Puchkovska, Institute of Physics (Ukraine)
Alexander Yu. Slepoukhine, Saratov State Technical Univ. (Russia)
E. S. Vedyaeva, Saratov State Univ. (Russia)

Published in SPIE Proceedings Vol. 4938:
Selected Papers from the International Conference on Spectroscopy of Molecules and Crystals
Galina A. Puchkovska; Sergey A. Kostyukevych, Editor(s)

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