Synthesis and characterization of smectic polymesomorphism in higher homologues of nO.m compounds |
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| Authors: | V G K M Pisipati N V S Rao B Chidambara Sastry P Bhaskara Rao G Padmaja Rani P R Alapati |
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| Institution: |
a Faculty of Physical Sciences, Nagarjuna University, Nagarjunanagar, India
b Department of Chemistry, University of Southampton, Southampton, England |
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| Abstract: | Some of the higher homologues of the N-(p-n-alkoxybenzylidene)p-n-alkylanilines, n O.m, compounds with n ≧ 8 and m ≧ 5 have been synthesized and the smectic polymesomorphism studied. The transition temperatures were obtained from both thermal microscopy and differential scanning calorimetry. These compounds in the n O.m series exhibit the usual phase sequences, viz. SASCSBSG, and SASBSG apart from SASCSFSG by 9O.8 (and some higher n O.m, like 9O.6). These phases were confirmed by miscibility studies with standard materials. The smectic F phase in 9O.8 compound is also confirmed by an X-ray diffraction study. |
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