Crystals of the [C6H4N3(C3H5)(2)]Cu2Br3 pi-complex are obtained from CuBr2 and alcohol solution of 1,3-diallylbenzotriazolium bromide by ac electrochemical synthesis and X-ray structurally characterized (a CAD-4 single-crystal autodiffractometer, CuKalpha radiation, 2816 independent reflections with \F\ greater than or equal to 4 sigma \F\, 2 theta(max) = 150 degrees, R = 0.0681). The compound crystallizes in the triclinic system, space group P (1) over bar, a = 7.2986(5), b = 8.6900(5), c = 12.743(1) Angstrom, alpha = 94.336(7)degrees, beta = 91.753(8)degrees gamma = 96. 499(6)degrees, rho(calcd) = 2.3537(6) g/cm(3), Z = 2 for [C6H4N3(C3H5)(2)]Cu2Br3. In the structure, the separate Cu2Br2 dimers are bridged by the bromine atom to form infinite chains (Cu2Br3)(n) oriented along the [001] direction. The ligand is coordinated to two metal atoms of different inorganic chains through the C=C bonds of both allyl groups, while the nitrogen atoms are not involved in the coordination. The environment of each of the two crystallographically independent copper atoms comprises three bromine atoms and the C=C group. One of the metal-coordinated C=C bonds is disordered.
