Orthometallation reaction at a binuclear pyrazolyl(pz) bridged rhodium compound: synthesis and crystal structure determination of Rh2(µ-pz)2[µ-P(C6F4)Ph2]Br(CO)(pcBr), pcBr = P(o-BrC6F4)Ph2

Abstract

The complex [Rh(µ-pz)(CO)(pcBr)]₂[pz = pyrazoly, pcBr = P(o-BrC₆F₄)Ph₂] undergoes orthometallation in refluxing toluene to give a new binuclear compound containing a rhodium–rhodium bond, Rh₂ Rh₂(µ-pz)₂(µ-pc)Br(CO)(pcBr)[pc = P(C₆F₄)Ph₂], which has been structurally characterized by X-ray crystallography; the complex has two pyrazolyl groups and one orthometallated phosphine bridging the two in equivalent rhodium atoms, and one phosphine ligand chelating one of the rhodium atoms via P and the bromine atom from the o-bromotetrafluorophenyl group.