The synthesis and mesogenic behaviour of a homologous series of copper(II) complexes derived from 5-(4-alkoxybenzoyloxy)salicylaldehydes are reported. The complexes exhibit smectic C mesomorphism for alkoxy groups containing eight or more carbon atoms in the terminal chains. These aldehydes therefore favour the formation of metal complexes with liquid-crystalline properties. Electron paramagnetic resonance (EPR) measurements were performed as a function of temperature. The signal can be associated with square-planar Cu2+ ions having an |x2y2 > ground state. Molecular orientation in the mesophase under a magnetic field is discussed.
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Campillos et al. (1991) studied this question.
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