92763-44-5Relevant academic research and scientific papers
Rhodium(I) carbonyl complexes of (diphenylphosphino)acetic acid
Jegorov,Kratochvíl,Langer,Podlahová
, p. 4288 - 4291 (2008/10/08)
Rhodium(I) and (diphenylphosphino)acetic acid (HA) form trans square-planar complexes Rh(CO)X(HA)2 (X = Cl, Br, I) and Rh(CO)A(HA), in which HA acts as a P-monodentate ligand and A- as a P,O-chelating ligand. All the complexes are fairly reactive and readily undergo oxidative-addition reactions. In the solid state, the latter complex forms several crystalline modifications. The X-ray crystal structure determination of α-carbonyl((diphenylphosphino)acetato-P,O)-((diphenylphosphino)acetic acid-P)rhodium(I), α-Rh(CO)A(HA), demonstrated a distorted square-planar arrangement around rhodium with Rh-C = 1.773 (11) A?, Rh-P(monodentate) = 2.346 (2) A?, Rh-P(chelating) = 2.302 (2) A?, Rh-O = 2.064 (6) A?, and P-Rh-P = 170.8 (1)°. The distortion due to the chelating A- anion renders the carbon monoxide sterically more accessible than in complexes of monodentate phosphines. There is a short Rh-H interaction of 2.80 (7) A? with a phenyl ortho hydrogen atom of the HA ligand, which forces the rhodium atom 0.03 A? out of the plane of the donor atoms. Two formula units of the complex are hydrogen bonded, forming a centrosymmetrical dimer. The complex crystallizes in space group P1 with a = 9.783 (4) A?, b = 11.702 (6) A?, c = 13.120 (6) A?, α = 76.87 (4)°, β = 81.21 (4)°, γ = 71.77 (4)°, and Z = 2. The structure was refined anisotropically to R = 0.053 on the basis of 2367 unique reflections.
