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Features of the smectic e phases in some strongly polar biphenyls and tolanes

Four compounds with the isothiocyanate terminal group (–NCS) in tolane or biphenyl molecules, revealing E phase in a broad temperature range, have been investigated by means of the DSC, polarizing microscope, miscibility and X-ray methods. The investigations have confirmed that internal smectic E phase in those compounds was not identical and it has been characterized by different distortions of the orthoconic cell and interlayer correlation.