9 May 2001 Vibrational spectra structure and features of fluorinated derivatives of carboxylic acids
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Proceedings Volume 4243, Saratov Fall Meeting 2000: Laser Physics and Photonics; and Spectroscopy and Molecular Modeling; (2001); doi: 10.1117/12.426694
Event: Saratov Fall Meeting 2000, 2001, Saratov, Russian Federation
Abstract
The results of investigation of polymorphism and mesomorphic states of fluorinated derivatives of alkylcyclohexanecarboxylic acids nFACHCA (where n is the number of carbon atoms in the fluoroalkyl radicals) and the new results for n equals 4, 7 are discussed. The methods of vibrational spectroscopy (experimental, theoretical modeling) have been used. The samples were investigated 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- complexes with various orientations of fluoroalkyl radical and carboxylic group relative to the rest of the molecular complex. The polymorphism of the nFACHCA is conformational. The influence of H-bonds on the dynamics of H-complex, polymorphic crystalline modification and mesophase formation was determined. The transitions 'solid crystal -- liquid crystal -- isotropic liquid and solution' are accompanied by H-bonds system reconstruction, in which the dimers, associates, chain associates and monomers appear.
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Lev M. Babkov, E. S. Vedyaeva, S. K. Truchatchev, G. A. Puchkovskaya, "Vibrational spectra structure and features of fluorinated derivatives of carboxylic acids", Proc. SPIE 4243, Saratov Fall Meeting 2000: Laser Physics and Photonics; and Spectroscopy and Molecular Modeling, (9 May 2001); doi: 10.1117/12.426694; http://dx.doi.org/10.1117/12.426694
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KEYWORDS
Liquid crystals

Crystals

Absorption

Molecules

Spectroscopy

Temperature metrology

Chemical species

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