Design synthesis and crystalline structure of copper(I) halide complexes

Utilizing 1,2-bis(diphenylphosphino)ethane(dppe),1,4-bis(diphenylphosphino)butane(dppb),and cuprous halide as the starting materials,a trinuclear copper(I) bromide complex [{Cu 2(μ-dppe)(μ-Br) 2 }(μdppe) 2 CuBr](1) and a binuclear copper(I) iodide complex [{Cu(dppb)I} 2(μ-dppb)](2) were synthesized and structurally characterized.As revealed by single-crystal X-ray diffraction,compound 1 is a trinuclear copper(I) complex in which the Cu1 and Cu2 atoms adopt a common four-coordinate mode.Each connects with two bromide and two phosphorus atoms,respectively,forming a distorted tetrahedral configuration.The Cu3 atom is trigonally coordinated via two phosphorus and one bromide atoms by generating a plane triangle.These three copper(I) atoms(Cu1,Cu2,Cu3) give a nearly isosceles triangle together.Compound 2 is a binuclear Cu(I) complex,in which these three dppb ligands offer two kinds of coordination fashions: two of them are chelating, one for each copper atom.However,the third one acts as a bridge assembling two same {Cu(dppb)I} moieties into a copper(I) dimer.