The first theoretical evidence for tetracoordinate planar nonmetals hosted at the centers of square hydrometal complexes M4H4X (M=Cu, Ni; X=B, C, N, O; see picture) has been obtained by ab initio calculations. These predictions may open a new branch of chemistry of nonmetal-centered hydrometals with potential applications as catalysts.
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Li et al. (2004) studied this question.
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