Base-promoted synthesis of monometallic and bimetallic platinum complexes containing chelating O,O- or S,S-donor ligands
摘要:
Dichloroplatinum complexes [PtCl2L2] (L-2 = cod, dppp) react with 1,2-C6H4E2 (E = O, S) in the presence of a base to produce mononuclear complexes The diene was not readily displaced from [Pt(E2C6H4-EE)(cod)]. A second approach to complexes containing dianionic chelating ligands involved [Pt(acac)2] as precursor. Reaction with dppp and oxalic acid gave [Pt(C2O4)(dppp)], whereas the analogous reaction with Ph2PC -CPPh2 produced the bimetallic complex [Pt(C2O4-OO)(mu-Ph2PC CPPh2)(2). Similar reactions with 1,2-C6H4E2 (E = O, S) also gave bimetallic products. The structures of [Pt(C2O4)(dppp)] and [Pt(C2O4-OO)(mu-Ph2PC CPPh2)](2) have been determined by X-ray crystallography. (c) 2006 Elsevier B.V. All rights reserved.