Mesomorphic and Photoconducting Behavior of 2-(2-Hydroxy-4-alkoxybenzylideneamino)-9-methylcarbazoles

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Abstract
The mesomorphic properties of 2-(2-hydroxy-4-alkoxybenzylideneamino)-9-methyl-carbazoles were investigated and the photoconducting behavior of the crystalline, nematic and isotropic liquid phases were compared for the pentyloxy compound. It was found that the behavior in the nematic phase is comparable with that in the isotropic liquid phase, both being fluid, rather than that in the crystalline phase. The carrier transport mechanisms and the carrier species are implied to be ionic. The current-voltage characteristics showed a new behavior in the fluid states, being similar to that of the negative resistance.