P. A. Kumar, P. Swathi, V. G. K. M. Pisipati, A. V. Rajeswari: Induced Crystal-G Phase through Intermolecular Hydrogen Bonding Part XIV: Influence of Alkyl Carbons of p-Hydroxybenzoates on Phase Distribution of Induced Phase

Crystal Research and Technology

Cryst. Res. Technol. 37 (2002) 595 - Abstract -

P. A. Kumar, P. Swathi, V. G. K. M. Pisipati, A. V. Rajeswari*

Centre for Liquid Crystal Research and Education, Faculty of Physical Sciences, Nagarjuna University, Nagarjunanagar India
*Department of Physics, Nagarjuna University, Nagarjunanagar India

Induced Crystal-G Phase through Intermolecular Hydrogen Bonding Part XIV: Influence of Alkyl Carbons of p-Hydroxybenzoates on Phase Distribution of Induced Phase

Two novel series of intermolecular hydrogen-bonded liquid crystal complexes resulting from equimolar combinations of p-n-alkoxybenzoic acids (nABA) (where n represents alkoxy carbon numbers 3 to10 and 12) and non-mesogens viz. ethyl-p-hydroxybenzoate (EHB) and propyl-p-hydroxybenzoate (PHB) have been synthesized. The formation and stabilization of the hydrogen bonding is confirmed by infrared spectral study, which reveals the terminal functionalities, -COOH and -OH moieties are complementary to each other by acting as both proton donor and acceptor. The results of comparative thermal and phase analyses of both the series are discussed in conjunction with free- p-n-alkoxybenzoic acids. The induction of crystal-G phase with wide thermal spans is observed in the present complexes.

Keywords: hydrogen bonding, nABA, EHB, PHB, crystal-G phase

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