Abstract
Three macrocyclic complexes of Pb2+ have been synthesised using liquid crystalline macrocyclic ligands derived from diesters of 1,8 dihydroxy ethyl 1, 3, 6, 8, 10, 13 hexa aza cyclotetradecane. The diesters are prepared by using butoxy benzoic acid, heptyloxy benzoic acid or octyloxy benzoic acid. The isolated ligands and their Pb2+ complexes are characterised by elemental analysis, TGA, FTIR, X-ray and DSC Studies. The complexes are found to show four co-ordinated geometry with Pb2+ inside the cyclic structure. From polarising microscope and DSC studies, it is revealed that the Pb2+ complexes are non-mesogenic, though the ligands are mesogenic. The transition temperature of ligands is in the range of 125°C to 130°C. The complexes show isotropy in the range of 175°C to 185°C.
Published Version
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