Crystal structure of {[2-(diphenylphosphino)ethyl]diphenylphosphine oxide}iodonitrosylcobalt(0)

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Abstract
Crystals of the title compound are monoclinic with a= 29·139(15), b= 9·002(5), c= 24·096(13)Å, β= 117·67(2)°, Z= 8, space group C2/c. 1499 Counter intensities were used, and the structure was solved by Patterson and Fourier methods and refined by least squares to R 7·43%. Both nitrosyl groups are disordered between two alternative positions (A) and (B), but it was not possible to resolve the nitrogen atoms into N(A) and N(B). The co-ordination around the cobalt is distorted tetrahedral with N(1)–Co–N(2) 119·9°. Angles at the nitrogen atoms are: Co–N(1)–O(1A) 120·5, Co–N(1)–O(1B) 166·3, Co–N(2)–O(2A) 154·6, and Co–N(2)–O(2B) 149·0°. This is the first example of a distinctly bent M–N–O linkage in a four-co-ordinate nitrosyl complex. The mode of bonding of the nitrosyl ligands and their influence on the geometry of the complex are discussed.

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