Six cis coordinated H2O molecules of the triangular cluster complexes M3(μ3-S)((μ2-S)3(H2O)9]4+ (M = Mo, W) (hydrogen bond donors) complementary to six portal oxygen atoms of cucurbituril (acceptors). The shape and symmetry of the building blocks induce specific crystal structures.
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Fedin et al. (2000) studied this question.
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