The Crystal and Molecular Structure of Potassium Azidopentacyanocobaltate(III) Dihydrate: K3[Co(CN)5N3].2H2O

E. E. CASTELLANO; O. E. PIRO; G. PUNTE; J. I. AMALVY; E. L. VARETTI; P. J. AYMONINO

Acta Cryst. B

IUCr

Año: 1982 vol. 38 p. 2239 - 2242

Abstraet. K3[Co(CN)5N3].2H20, M r = 384.38, triclinic, P-1, a = 8.514(2), b = 8.943(1), c = 9.397 (2)A, calpha = 81.47(2), beta = 76.32(2), gamma = 75.95 (1) °, V = 671.3 (3) A^3, Z = 2, Dc = 1.902, Dm = 1.88 (1) Mg. m^-3, MoKanpha radiation, lamda = 0.71073 A, mu(MoKapha) = 2.13 mm^-l, F(000) = 380. The structure was solved by Patterson methods and refined by full-matrix least squares with anisotropic temperature factors for all non-hydrogen atoms to final R factors of R = 0.035 and Rw = 0.036 for 1184 reflections. The structure shows a local plane of symmetry perpendicular to the a-axis. The coordination around the Co(III) ion is approximately octahedral with mean Co-C and Co-N distances of 1.89 (2) and 2.005 (5) A,  respectively. The azide group is linear and asymmetric with the N-N bond nearer to the metal of length 1.204 (7) A and the other of length 1.156 (7) A.