E.Donald McKenzie
1978
Citations
0
Influential Citations
5
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract Cyrstals of the title compound, obtained from tetracyanothylene and trans -cinamylbis(dimethylglyoximato)cobalt(III), were triclinic with a = 11.869(8), b + 12.892(8), c = 10.134(9) A, α = 79.90(1), β = 72.44(2), γ = 71.75(1)°, spcae gropu P 1 , and Z = 2. The structure was solved by conventional Patterson and Fourier techniques, and refined anisotropically by block-diagonal least-squares methods to a final R of 0.046. The analysis shows the cyclopentyl carbanion ligand to have a trans arrangement of substituents. As unusually lon CoC distance of 2.049(7) A is opposed by an unsusually short trans CoN bond to imidazole of 2.00(7) A. The phenyl substituent of the carbanion ligand appears to be π-bonded to a glyoximato moiety. The two short hydrogen bonds between oxygens of opposing glyoximato units are different: one, at 2.455(10) A, is near the lower limit of observed hydrogen bonds and the other, at 2.518(9) A, is the longest of any presently known in such ‘cobaloxime’ structures. The latter is associated with another hydrogen bond between one of the oxygens and NH of an imidazole, and with the π-bond to the phenyl.