Induced crystal G phase through intermolecular hydrogen bonding VII. Influence of non-covalent interactions on mesomorphism and crystallization kinetics

Srinivasulu, M and Satyanarayana, P V V and Kumar, P A and Pisipati, V G K M (2010) Induced crystal G phase through intermolecular hydrogen bonding VII. Influence of non-covalent interactions on mesomorphism and crystallization kinetics. Liquid Crystals, 28 (9). pp. 1321-1329. ISSN 1366-5855

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Official URL: http://dx.doi.org/10.1080/02678290110062231

Abstract

A series of intermolecular hydrogen bonding complexes, 2,2¾-bipyridine : p-n-alkoxybenzoic acids (BP : nABA) was isolated from liquid crystalline p-n-alkoxybenzoic acids (nABA) (where n represents alkoxy carbon numbers, 3 to 10 and 12) and a non-mesogen, 2,2¾-bipyridine (BP). The thermal and phase behaviour of these complexes was studied by thermal microscopy and diOEerential scanning calorimetry (DSC). These studies revealed the induction of tilted smectic F and crystal G phases. The structural elucidation pertaining to the formation of intermolecular hydrogen bonding was carried out by a detailed IR spectral investigation. Comparative crystallization kinectic studies using DSC, performed on two representative compounds, showed diOEerent forms of the crystallization process. The magnitudes of the Avrami exponent n suggests two diOEerent mechanisms operate for individual members leading to sporadic three-dimensional growth. Nevertheless, an overall unique mechanism is predicted to operate at each crystallization temperature investigated, while the Avrami constant b shows a temperature dependence suggesting a strong in� uence of alkoxy terminal groups on the rates of nucleation.

Item Type: Article
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 27 Jan 2015 06:37
Last Modified: 27 Jan 2015 06:37
URI: http://eprints.manipal.edu/id/eprint/141720

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