Synthesis, crystal structure and thermal stability study of [Cu2(bpe)X2]n(bpe=1,2-trans-bi(4-pyridyl)ethene, X=Cl, Br, I)

A series of copper(I) halide complexes bridged by bpe (bpe= 1,2-trans-bi(4-pyridyl)ethene), [CU2(bpe)Cl-2](n), (1), [Cu-2(bpe)Br-2](n) (2) and [Cu-2(bpe)I-2](n) (3) were successfully synthesized and complex 1 has been structurally characterized by a single crystal X-ray diffraction method. Crystal data for 1 are monoclinic, space group P2(1)/c, a= 0.3788(8) nm, b= 1.5059(3) nm, c= 1.0875(2) nm, beta=96.262(4)degrees, V=0.6165(2) nm(3), Z= 2, S = 1.002, final R indices [I > 2 sigma(I)] R-1 =0.0288, wR(2)=0.0579, R index (all data) R-1 =0.0509, wR(2)=0.0615. Elemental analyses and IR spectra reveal that the complexes are of isomorphic compounds.. In addition, thermogravimetric analyses were also applied to research of the thermal stability of the title complexes.