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Abstract
In this paper we report on a synthesis and basic characterisation (polarising optical microscopy, differential scanning calorimetry, thermo-optical analysis) of four new liquid-crystalline compounds. These are 4''-heptylphenyl 4-[(4'-nonyloxyphenyl)diazenyl]benzoate and its three derivatives differentiating from the parent compound either by having a sulphur atom in the ester group or an oxygen atom in the heptyl chain or both these features, thus constituting a cross-section of four new groups of derivatives. We describe and compare their liquid-crystalline polymorphism and comment on the effect such structure changes have on appearing mesophases, and their temperature range.
Acknowledgments
The authors would like to thank Professor Dabrowski from the Military University of Technology, Warsaw, Poland for supplying them with 1g of 4-heptylphenol. We particularly thank Joanna Godzwon for her expert opinion in the identification of mesophases of the described compounds.
