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1,4-Dimethoxytriptycene (diMeO-TP) and triptycenequinone (TPQ), non-planar donor and acceptor molecules respectively, were found to form two types of mixed crystals with limited solubility, i.e., (diMeO-TP) x (TPQ) 1-x with x=ca.0.25 and (diMeO-TP) x (TPQ) 1-x with x=ca.0.97. Crystal structures of the mixed crystals suggested that their characteristic colors, which are different from those of TPQ (yellow) and diMeO-TP (colorless), are caused by local CT interactions between 1,4-benzoquinone and 1,4-dimethoxybenzene moieties in the crystals. The present mixed crystals can be regarded as non-stoichiometric quinhydrone-type CT complexes similar to that formed by TPQ and TPHQ (triptycenehydroquinone).

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