tert-Butylbis(dimethylglyoximato-N,N')(triphenylphosphine-P)rhodium

The title structure {bis[2,3-butanedione dioximato(1-)-N,N'](tert-butyl)(triphenylphosphine-P)rhodium, [Rh(C 4 H 7 N 2 O 2 ) 2 (C 4 H 9 )(C 18 H 15 P)]} consists of discrete complexes in which the Rh atom displays distorted octahedral coordination, with the two dimethylglyoxime ligands in the equatorial plane and the tert-butyl and triphenylphosphine groups in the axial positions. The Rh atom is displaced by 0.048(1)A from the mean plane through the four oxime N donor atoms towards the P atom. The Rh-N distances range from 1.930(3) to 1.982 (2) A, while the axial Rh-P and Rh-C distances are 2.492(1) and 2.216 (3) A, respectively. Comparison of the results with those obtained previously for other compounds of this type indicates that the trans influence of R in the axial fragment Ph 3 P-Rh-R is determined by its σ-donor power, while the Rh-C bond distance depends on the steric interaction of R with the equatorial moiety.