A new azo group containing host compound, 3-{4-[4-(3-hydroxy-3,3-diphenylprop-1-ynyl)phenylazo]phenyl}-1,1-diphenylprop-2-yn-1-ol (1), exhibits a color change from yellow to red upon inclusion complexation with various guest compounds in the solid state.
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Tanaka et al. (2002) studied this question.
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