Fred E. Wood

The synthesis and structural characterization of (2-pyridyldiphenylphosphine oxide)platinum(IV)tetrabromide. A chelating phosphine oxide with a substantially bent PtOP angle

Abstract The complex (pyPh2PO)PtBr4 (pyPh2PO is 2-pyridyldiphenylphosphine oxide) has been synthesized by three different pathways, and its structure has been established by X-ray crystallography. C17H14Br4NOPPt crystallizes in the space group P21/c (no. 14) with cell dimensions (at 140 K) of a = 13.696(7), b= 16.653(5), c = 17.612(7) A, β = 92.23(4)°, Z = 8 and V = 3993(3) A3. The structure was refined by block-cascade least-squares to a conventional R value of 0.048 using 3647 significant data. The structure involves a six-coordinate platinum((IV) ion with the chelated ligand bound through its nitrogen and oxygen atoms. The two crystallography independent molecules in the asymmetric unit have very similar dimensions. To our knowledge this is the first reported structure of a chelating phosphine oxide. The PtOP angles within the rings are 114.4(6)° and 117.4(6)°.

Rupture and realignement of the bridging phosphine framework in the reactions of polynuclear rhodium complexes of 2,6-bis(diphenylphosphino)pyridine

Exemple de rupture et de realignement dans le traitement du complexe Rh 4 [μ-(Ph 2 P) 2 py] 2 (μ-CO)(CO) 2 (μ-Cl) 2 Cl 2 avec le monoxyde de carbone dans le chloroforme. Formation de [Rh 2 (μ-Ph 2 P) 2 Py] 2 (CO) 2 (CH 3 OH)Cl[PF 6 ] dont on etudie la structure