The search for co-crystals of amines as bifunctional hydrogen-bond donors with bidentate oxygens as bifunctional hydrogen-bond acceptors, as part of a program to investigate the utility of using the (8) hydrogen-bonding motif, has yielded three co-crystals of benzidine with p- benzoquinone, diphenyl sulfoxide, and triphenylphosphine oxide. The crystal structures for all three materials are reported. Only the co-crystal structure of benzidine/diphenyl sulfoxide/water reveals the desired motif.
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Rafilovich et al. (2007) studied this question.
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