Synthesis, Crystal Structure and Non-Linear Optical Properties of ( NEt4)4(Cu6Mo2S6O2Br2I4).

The reaction of [NH4]2[MoO2S2], Cul and NEt4Br in the solid state produced [NEt4]4[Cu6Mo2S6O2Br2I4]. Single-crystal X-ray analysis reveals that the cluster anion consists of two nest-shaped fragments interconnected through a Cul2Cu bridge with Cu–I and Cu ⋯ I bond lengths of 2.502 and 2.972 A respectively. The cluster forms monoclinic crystals with space group C2/c, a= 24.423(9), b= 21.021(2), c= 13.715(5)A, β= 114.48(3)° and Z= 4; R= 0.067, R′= 0.087. It exhibits interesting optical-limiting and self-defocusing properties.