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Characterisation and mesomorphic behaviour of new aliphatic-aromatic azomethines containing ester groups

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Two series of novel symmetrical azomethines prepared by the condensation of 4,4'-(butane-1,4-diylbis(oxy))bis(butane-4,1-diyl)bis(4-aminobenzoate) (PBBA470) and 5,10,15,20,25,30,35,40,45,50,55,60-dodecaoxatetrahexacontane-1,64-diylbis(4-aminobenzoate) (PBBA 1200) with a range of aldehydes have been characterised by 1H and 13C nuclear magnetic resonance, Fourier transform infrared and UV-Vis spectroscopy. Current-voltage measurements were performed using a device comprising indium-tin oxide/compound/Alq3/Al. The effect of rod length and the nature of the terminal chains on the thermal and mesomorphic behaviour of these materials were investigated by differential scanning calorimetry, polarising optical microscopy and wide- and small-angle X-ray diffraction. Additionally, the compounds were studied using various atomic force microscopy techniques, including mode and phase imaging, and measurements based on local contrast force-distance curves and roughness, together with skew and kurtosis, are presented.
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Keywords: azomethines; electrical properties; imines; liquid crystals; oligomers; optical properties

Document Type: Research Article

Affiliations: 1: Electrotechnical Institute, Division of Electrotechnology and Materials Science, Wroclaw, Poland 2: Department of Chemistry, University of Warsaw, Warsaw, Poland 3: Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland

Publication date: 01 December 2010

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