The tetracyanoborate anion as a building block for the heterocubane cluster cage [Cr4{B(CN)4}4]4.

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The tetracyanoborate anion [B(CN)4]- (TCB) was utilized as a building block for the synthesis of polynuclear chromium carbonyl compounds upon photolytic reaction with [Cr(CO)6]. Up to four κN-coordinated cyano groups of TCB can be involved in binding to chromium, giving mixtures of [B(CN)4-x{CN-Cr(CO)5}x]- (x = 1-4; 1-4) and [{Cr(CO)4(B(CN)4)}2]2- (5). The reaction of [B(CN)4]- with fac-[Cr(CO)3(MeCN)3] led to isolation of salts of the tetraanionic heterocubane cage [{Cr(CO)3(B(CN)4)}4]4-.