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Liquid Crystals Volume 29, 2002 - Issue 8
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Original Articles

Design and characterization of novel supramolecular liquid crystals involving multiple hydrogen bonds

Min Li
,
Chaowei Guo
&
Yuqing Wu
Pages 1031-1037 | Published online: 11 Nov 2010
 
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Abstract

A novel type of liquid crystalline system, namely 5-[4-(4-methoxyphenylazo)phenyloxyalkyloxy]isophthalic acidhydrazides (Dn , n = 3, 6, 10) was designed and synthesized. The FTIR spectra of the Dn compounds were examined in the range 4000-1000 cm−1 at different temperatures. The results showed that the stretching vibration frequencies of the NH and C=O groups, and the NH2 deformation shifted to lower frequencies with decrease of temperature, while out-of-plane NH bending shifted slightly to higher frequency. Intermolecular hydrogen bonding between NH, NH2 and C=O groups is proposed and the schematic supramolecular Dn structure is given. This may explain the higher Dn transitional temperatures and their smectic phase behaviour compared with that of 5-[4-(4-methoxyphenylazo)phenyloxyalkyloxy]isophthalic acid diethyl esters.

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