Syntheses of binuclear copper(I) complexes containing benzimidazole

A binuclear copper(I) complex [Cu-2(dppm)(2)(C7H6N2)(2)](NO3)(2) (C7H6N2 = benzimidazole, dppm = Ph2PCH2PPh2) has been synthesized and characterized by X-ray crystallography. The crystal belongs to monoclinic, space group C2/c with a = 14.167(3), b = 21.209(4), c = 20.680(4) angstrom, beta = 103.93(3)degrees, C32H28CuN3O3P2, M-r = 628.05, Z = 8, mu = 0.868 mm(-1), V = 6031(2) angstrom(3), F(000) = 2592, D-c=1.383 g/cm(3), R = 0.0593 and wR = 0.1736. A total of 5297 independent reflections were collected, of which 3503 were observed with 1 > 2 sigma(I). The central copper atom is tri-coordinated by phosphorus atoms from bridging dppm and nitrogen atom from benzimidazole. In the coordination sphere, the bond lengths of Cu-P(1) and Cu-P(2) are 2.2607(17) and 2.2503(16) angstrom, respectively and the P-Cu-P bond angle is 127.26(6)degrees.