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A Mixed-Valence Tetranuclear Copper Cluster with Localized Valencies

1997; American Chemical Society; Volume: 36; Issue: 11 Linguagem: Inglês

10.1021/ic9611002

1520-510X

Petra J. van Koningsbruggen, Jaap G. Haasnoot, H. Kooijman, J. Reedijk, Anthony L. Spek,

Metal-Organic Frameworks: Synthesis and Applications

A novel tetranuclear, mixed-valence compound, CuI2CuII2(LL)2Cl6 (LL = dinucleating 4-amino-3,5-bis[(N-methylamino)methyl]-1,2,4-triazole), is described. The molecule consists of a rhomboid of four Cu ions, with short Cu(I)−Cu(II) contacts of 3.875(1) and 4.022(1) Å and a Cu(II)−Cu(II) distance of 4.048(1) Å. An unusual "sandwich" interaction of 3.193(1) Å occurs between CuICl32- and the 1,2,4-triazole ring. The unpaired electrons are localized on the two Cu(II) ions, which are antiferromagnetically coupled.