title: Pi-accepting-pincer rhodium complexes: an unusual coordination mode of PCP-type systems.
abstract: The novel pi-accepting, pincer-type ligand, dipyrrolylphoshinoxylene (DPyPX), is introduced. This ligand has the strongest pi-accepting phosphines used so far in the PCP family of ligands and this results in some unusual coordination chemistry. The rhodium(I) complex, [(DPyPX)Rh(CO)(PR3)] (4, R=Ph, Et, pyrrolyl) is prepared by treating the relevant [(DPyPX)Rh(PR3)] (3) complex with CO and is remarkably resistant to loss of either ligand. X-ray crystallographic analysis of complex 4 b (R=Et) reveals an unusual cisoid coordination of the PCP phosphine ligands. These observations are supported by density functional theory (DFT) calculations.
authors.affiliation: Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel.
authors.forename: Elizaveta
authors.initials: E
authors.lastname: Kossoy
authors.forename: Mark A
authors.initials: MA
authors.lastname: Iron
authors.forename: Boris
authors.initials: B
authors.lastname: Rybtchinski
authors.forename: Yehoshoa
authors.initials: Y
authors.lastname: Ben-David
authors.forename: Linda J W
authors.initials: LJ
authors.lastname: Shimon
authors.forename: Leonid
authors.initials: L
authors.lastname: Konstantinovski
authors.forename: Jan M L
authors.initials: JM
authors.lastname: Martin
authors.forename: David
authors.initials: D
authors.lastname: Milstein