The Crystal Structure of fae-Tricyanotriamminecobalt(III)a

Abstract

The molecular and crystal structure of fac-tricyanotriamminecobalt(III), fac(Co(CN)8(NH3)3), has been determined by the three dimensional X-ray dataco11ected by means of the photographic method using FeK. radiation. The R valuewas finally reduced to O.11 by the block diagonal least-squares .analysis based on 473 visual date, The congplex cryStg11ized in the orthorhombic form with space group P 2i2i2i; a=9.95 A, b=11.05 A, c=6.58 A; Dm=1.74 g.cm 8, D. X73 g.cm S; Z=4.
Three nitrogen (ammine) and three carbon atoms were octahedrally coordinated to the central cobalt atom, forming the fac isomer. The average bond distances were as follows; Co-N(NHs) 2.01 A, Co-C 1.86 A, C-N 1, 18 A.