Synthesis, structure and characterization of the trinuclear copper(I) complex [Cu-3(mu(3)-Br)(2)(dppm)(3)]Br

The novel trinuclear copper(I) complex [Cu-3(mu(3)-Br)(2)(dppm)(3)]Br has b een obtained by reaction of bis(diphenyl-phosphino)methane (dppm) with cupr ic bromide. The title complex was characterized by single-crystal X-ray ana lysis, elemental analysis, molecular weight determination, P-31 NMR and its conductivity was also measured. The [Cu-3(dppm)(3)Br-2](+) cation consists of a triangular array of copper atoms, with dppm ligands (Ph2PCH2PPh2) bri dging each edge of the triangle and two triply bridging Br groups bound to the two faces of the Cu-3 unit. Crystallographic data: monoclinic, space gr oup P2(1)/c; a = 1.4739(4), b = 1.7708(5), c = 2.8395(8) nm, beta = 97.16(3 )degrees, V = 7.353 nm(3), Z = 4, F(000) = 3296, D-calc. = 1.472 g/cm(3), m u = 26.478 cm(-1), R = 0.06, R-w = 0.08, 4654 reflections observed with I > 3 sigma(I).