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Abstract
A number of dyes based on the 1,4-naphthoquinone structure have been synthesised. By ring closure across positions 2– and 3–, naphthimidazoles have been obtained which show improved order parameters and also photo-stabilities comparable with commercial anthraquinonoid dyes. The results are discussed on the basis of comparison with ground state dipole and transition moments as calculated by PPP-MO methods. Solubilities of the dyes in E44 (BDH Chemicals Ltd.) liquid crystal host have also been determined, but little correlation between saturation concentration and solubility parameter has been found.