SYNTHESIS AND STRUCTURE DETERMINATION OF SOME PLATINUM(II) COMPLEXES WITH HYDROPHILIC CARBOXYLATED TERTIARY PHOSPHINE-LIGANDS

[Pt(COD)Cl-2] (1) reacts with PPh(2)(C6H4COOH) (2a,b,c), PPh(2)(C6H4CO ONa) (2d), PPh(C6H4COOH)(2) (4b,c) and P(C6H4COOH)(3) (6b,c) with form ation of the corresponding complexes [Pt(L)(2)Cl-2] (3a,b,c,d,6b,c,7b, c). Halide abstraction from 3a by Ag+ promotes coordination of the ort ho-carboxylate function to platinum, yielding [Pt{PPh(2)(C6H4COO-2)}{P Ph(2)(C6H4COOH-2)}Cl] (8) and [Pt{PPh(2)(C6H4COO-2)}] (9). Reaction of 1 with CO and 2a or 2b gives [Pt(C)(L)Cl-2] (10a,b), whereas 1 and 2, 3-bis-(diphenylphosphino) maleic anhydride yields [Pt{Ph(2)PC=C(PPh(2) )COOCO}Cl-2] (12) and [Pt{Ph(2)PC(COOH)=C(COOMe)-PPh(2)}Cl-2] (13). Th e H-1, C-13 and P-31 NMR spectra are reported and discussed. The X-ray structural analysis of 3b showed the compound to be monoclinic, space group P2(1)/n,Z=4, with a=1038.5(3),b=1792.6(4),c=2311.5(4) pm, beta= 91.6(2)degrees and D-calc=1.353 g cm(-3). The structure was solved fro m 4832 observed reflections with F-0>4 sigma(F-0) and refined to a fin al R value of 0.0743. The Pt atom is surrounded by two Cl and two P at oms in a square planar arrangement.