STRUCTURE OF BROMODICYANO(2,2'/6',2''-TERPYRIDINE)GOLD(III)

C17H11BrN5, M(r) = 562.19, monoclinic, P2(1)/c, a = 13.229 (2), b = 11.069 (2), c = 12.849 (1) angstrom, beta = 117.92 (9)-degrees, V = 1661.3 (4) angstrom3, Z = 4, D(x) = 2.25 g cm-3, lambda(Mo K-alpha) = 0.71069 angstrom, mu = 112.3 cm-1, F(000) = 1048, T = 298 K, R = 0.030 for 2186 observed independent reflections. The coordination is distorted square-pyramidal and terpyridine acts as a bidentate ligand with one N atom in the basal square [Au-N = 2.078 (6) angstrom] and the other in the apical position at a distance of 2.839 (5) angstrom which is intermediate between the sum of the covalent and van der Waals radii. The geometry of the coordination polyhedron is discussed by comparing the present structure with other square-pyramidal or square-planar Au(III) complexes of known molecular structure.