Synthesis, Crystal Structure and Photoluminescent Properties of a New Dinuclear Copper(I) Complex [Cu_2(μ_2-dppm)_2(MeCN)_2(μ_2-MeCN)](ClO_4)_2·MeCN

The title compound Cu_2(μ_2-dppm)_2(MeCN)_2(μ_2-MeCN)](ClO_4)_2·MeCN (dppm = bis(diphenylphosphino)methane) has been prepared and characterized. It crystallizes in the monoclinic system, space group P2_1/n, with a = 11.904(6), b = 20.755(11), c = 24.744(13) (A),β = 98.226(12)°, C_(58)H_(56)Cl_2Cu_2N_4O_8P_4,M_r= 1258.93, V=6051(5) (A)~3, Z = 4,D_c= 1.382 g/cm~3,μ = 9.52 mm~(-1), F(000) = 2592, R = 0.0533 and wR = 0.1295 for 6175 observed reflections with I > 2σ(I). Each Cu(I) center is tetrahedrally coordinated by two phosphine atoms from two bridging dppm ligands, one nitrogen atom from a terminally coordinated acetonitrile molecule, and another nitrogen atom from a μ_2-acetonitrile molecule. The two Cu(I) centers are bridged by two dppm ligands as well as a unique acetonitrile molecule. The full molecule exhibits a 'chair-like' configuration. This dinuclear complex exhibits intense or middle photoluminescence at room temperature in the solid state or actonitrile solution at 486 nm.