New thermotropic, liquid‐crystalline polyesters (5a, b, 6a, b) with mesogenic bipyridinediyl units were synthesized. They form complexes with Fe(II) and Cu(II) salts. Homopolyesters 5a, b, containing no metal or less than a certain amount of metal, are smectic. A nematic mesophase was observed in the case of copolyester 6a, b. The structural properties of a polyester complex 5a with Cu, as crystal, liquid‐crystal and isotropic liquid, were examined by ESR.
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Hanabusa et al. (1989) studied this question.
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