Mesogenic quinazolone derivatives: synthesis and characterisation |
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Authors: | AK Prajapati Vishal Modi |
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Institution: | 1. Applied Chemistry Department , Faculty of Technology and Engineering, The M.S. University of Baroda , Vadodara, India akprajapati@yahoo.co.uk;3. Applied Chemistry Department , Faculty of Technology and Engineering, The M.S. University of Baroda , Vadodara, India |
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Abstract: | Two new mesogenic homologous series of quinazolone derivatives have been synthesised by condensation of 4-n-alkoxybenzoyloxy benzaldehyde (for series I) / 4-n-alkoxy-3-methoxybenzoyloxy benzaldehyde (for series II) with 3-amino-2-methyl quinazolone in alcohol. The synthesised compounds are characterised by a combination of elemental analysis and standard spectroscopic methods. In series I, all the synthesised members exhibit the nematic mesophase. An enantiotropic smectic A phase is observed from the n-decyloxy derivative onward to the last homologue synthesised. Methoxy to n-propyloxy derivatives of series II are non-mesogenic, whereas the rest of the members exhibit a monotropic nematic mesophase. The mesomorphic properties of the present series I and II are compared with each other and with the other structurally related mesogenic homologous series to evaluate the effect of lateral methoxy substituent and quinazolone moiety on mesomorphism. |
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Keywords: | quinazolone derivatives Schiff's base ester smectic A nematic |
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