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Abstract
We have shown previously that smectic phase thermal stability in copper(II) complexes of 1-(4′-decylbiphenyl-4-yl)-3-(biphenyl-4-yl)propane-1,3-dionesis considerably enhanced by the introduction of polar substituents (F, Brand CF3) into the 4′-position of the lateral biphenyl unit. The preparation of a new series of complexes is described and the transition temperatures of the ligands and complexes reveal the effect on mesophase type and stability of a polar substituent at different positions in the molecule. The effects which fluoro-substituents have on the transition temperatures of the β-diketone ligands and the complexes are also compared with the effects produced by similar fluoro-substitution in terphenyl systems.