Copper(I) pi-complex with 1,3-diallylbenzotriazolium [C6H4N3(C3H5)(2)]Cu2Br3: Synthesis and crystal structure

Crystals of the [C6H4N3(C3H5)(2)]Cu2Br3 pi-complex are obtained from CuBr2 and alcohol solution of 1,3-diallylbenzotriazolium bromide by ac electroche mical synthesis and X-ray structurally characterized (a CAD-4 single-crysta l 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(ca lcd) = 2.3537(6) g/cm(3), Z = 2 for [C6H4N3(C3H5)(2)]Cu2Br3. In the structu re, the separate Cu2Br2 dimers are bridged by the bromine atom to form infi nite chains (Cu2Br3)(n) oriented along the [001] direction. The ligand is c oordinated 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 t he coordination. The environment of each of the two crystallographically in dependent copper atoms comprises three bromine atoms and the C=C group. One of the metal-coordinated C=C bonds is disordered.