Pd(O2CCF2CF3-O)2(dppf) and PdAg(μ-O2CCF2CF3)2(O2CCF2CF3-O)(dppf) [dppf = 1,1′-bis(diphenylphosphino)ferrocene]: A stable Pd(ii) phosphine carboxylate as a precursor to heterobimetallic carboxylates

Abstract

Single crystal X-ray diffraction analysis of Pd(O₂CCF₂CF₃-O)₂(dppf) 1 shows that one of the two unidentate fluoropropanoates shows a rare bonding behavior with significant π character for the CO_coord bond whereas the C–O_pendant bond is long and bears a basic function. Complex 1 serves as a metalloligand towards AgO₂CCF₂CF₃ to give PdAg(μ-O₂CCF₂CF₃)₂(O₂CCF₂CF₃-O)(dppf) 2, which is fluxional in solution showing interchanges of the bridging and unidentate fluoropropanoate groups. Being an unusually stable Pd(II) carboxylate, 1 also serves an effective entry to mixed-metal carboxylates.