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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Rus Eng

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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2016, 16 (4), 27—35.
DOI: 10.18083/LCAppl.2016.4.27





Manifestation of the Even-Odd Effect in the Molecular Parameters of p-n-Alkyloxybenzoic Acids and their Pyridine Esters



E. A. Lapykina, N. I. Giricheva, D. V. Korotkova, S. A. Syrbu

Author affiliations
Ivanovo State University,
39 Ermak St., Ivanovo, 153025, Russia
E-mail: n.i.giricheva@mail.ru

Abstract
The manifestation of alternation in changing of molecular parameters values of p-n-alkyloxybenzoic acids and their pyridine esters versus the number of carbon atoms in radicals was studied by DFT/B3LYP/cc-pVTZ method. It was found that molecular characteristics, such as geometric parameters (length , width, volume, rotational constant), as well as the components of the dipole moment exhibit even-odd effect comparable to that observed for the N &arrow; I phase transition temperature, while this effect was not observed in the values of total electron energy E and the thermodynamic functions G and H. As an example of homologous series of the p-n-alkyloxybenzoic acids and the pyridine esters of p-n-alkyloxybenzoic acids it was shown that the geometric structure of the individual compounds is one of the main reasons of even-odd effect manifestation in experimental macrocharacteristics of the processes, occurring in liquid crystal systems.

Keywords: even-odd effect, liquid crystals, p-n-alkyloxybenzoic acids, pyridine esters of p-n-alkyloxybenzoic acids, molecular characteristics, quantum chemical calculations





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