ETHYLGLYOXIMATO-N,N')(TRIPHENYLPHOSPHINE-P)RHODIUM

The title structure {bis[2,3-butanedione -)-N,N'](tert-butyl)(tripheny lphosphine-P)rhodium, [Rh(C4H7N2O2)(2)(C4H9)(C18H15P)]} consists of di screte complexes in which the Rh atom displays distorted octahedral co ordination, with the two dimethylglyoxime ligands in the equatorial pl ane and the tert-butyl and triphenylphosphine groups in the axial posi tions. The Rh atom is displaced by 0.048 (1) Angstrom from the mean pl ane through the four oxime N donor atoms towards the P atom. The Rh-N distances range from 1.930 (3) to 1.982 (2) Angstrom, while the axial Rh-P and Rh-C distances are 2.492 (1) and 2.216 (3) Angstrom, respecti vely. Comparison of the results with those obtained previously for oth er compounds of this type indicates that the trans influence of R in t he axial fragment Ph(3)P-Rh-R is determined by its cr-donor power, whi le the Rh-C bond distance depends on the steric interaction of R with the equatorial moiety.