Discotic Liquid Crystals of Transition Metal Complexes 111: The First π-Acceptor in Discotic Columnar Liquid Crystals Obtained from Octasubstituted Bis(diphenylethane-1,2-dithiolene)nickel Complexes

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Abstract
Disk-like complexes, bis[l,2-di(3′,4′-di-n-alkylphenyl)ethane-l,2-dithiolene]nickel (n-alkyl = n-hexyl, n-octyl) and bis[1,2-di(3′,4′-di-n-decyloxyphenyl)ethane-1,2-dithiolene]nickel have been synthesized and characterized. It was found that n-decyloxy derivative exhibits a hexagonal disordered columnar (Dhd) mesophase while n-alkyl derivatives are not discotic liquid crystals but isotropic liquids at room temperature. The half-wave potentials for reduction of these complexes is -0.04 ∼ -0.06V. n-Decyloxy derivative is the first π-acceptor in discotic columnar liquid crystals.