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Some binary liquid crystal mixtures based on phenyl-pyrimidine derivatives are investigated. Some of these derivatives are new and were found to have SmC or SmC* phases. They exhibit unusual binary phase diagrams like the existence of two eutectics and induced smectic A and smectic C phases. In some cases the melting point at intermediate concentrations is considerably higher than that of the two single substances. This indicates that a new compound is formed at about equal concentrations of the two substances. A possible explanation, the formation of an EDA complex, is discussed.
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Sharma et al. (1987) studied this question.
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