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The reaction of hexahydro-closo-hexaborate(2-) with copper(II) acetate and triphenylphosphine in acetonitrile yields the novel complex, Cu2[(C6H5)3P]4B6H6·2CH3CN. X-ray structural analysis shows that the complex crystallizes in the triclinic centro-symmetric space group, P1̄, with one molecule per unit cell. Each copper atom bonds to the hexaborate cage through two edge borons, forming a three-center two-electron B−Cu−B bond. The copper in this complex exhibits a trigonal-planar geometry and is a coordinatively unsaturated 16-electron center.
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Kabbani et al. (1999) studied this question.
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