Layered copper–nickel cyanide, CuNi(CN)4, a 2-D negative thermal expansion material, is one of a series of copper(II)-containing cyanides derived from Ni(CN)2. In CuNi(CN)4, unlike in Ni(CN)2, the cyanide groups are ordered generating square-planar Ni(CN)4 and Cu(NC)4 units. The adoption of square-planar geometry by Cu(II) in an extended solid is very unusual.
A. M. Chippindale, S. J. Hibble, E. Marelli, E. J. Bilbe, A. C. Hannon and M. Zbiri, Dalton Trans., 2015, 44, 12502 DOI: 10.1039/C5DT01127B
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