A novel eight-membered Cu4I4 ring supported by sulfur atoms of an M(mnt)2 moiety:: syntheses and crystal structures of (NBun4)2[M(mnt)2Cu4I4] (M = Ni, Pd, Pt;: mnt = 1,2-dicyano-1,2-ethylenedithiolato) with doubly-bridged one-dimensional chain structures

Crystal structure analyses of the title compounds revealed that they have almost the same structure with a novel eight-membered Cu4I4 ring supported by an M(mnt)(2) moiety, two cyano groups out of the four of which coordinate to two copper(I) ions in neighboring molecules, resulting in the formation of a unique doubly-bridged one-dimensional chain structure.