SYNTHESIS AND CHARACTERIZATION OF 5-COORDINATE PLATINUM(II) COMPLEXES [PT(2,9-DIMETHYL-1,10-PHENANTHROLINE) (SNRNX3-N)X(OLEFIN)] (X = CL OR BR - R = PH OR ME) - MOLECULAR-STRUCTURE OF [PT(2,9-DIMETHYL-1,10-PHENANTHROLINE)(SNPH2CL)CL(ETHYLENE)]

Five-coordinate olefin complexes of platinum(II) of the general formula [Pt(2,9-Me2-1,10-phen)(SnRnX3-n)X(olefin)] have been synthesized through oxidative addition of organotin halides RnSnX4-n to three-coordinate platinum(0) complexes [Pt(2,9-Me2-1,10-phen)(olefin)]. The X-ray crystal structure of the title complex has been determined. This crystallizes in the monoclinic system, space group P2(1)/n with a = 13.858(8), b = 13.730(6), c = 16.820(8) angstrom, beta = 102.44(5)-degrees, and Z = 4. Refinement converged at R = 0.04 (R(w) = 0.044). The geometry of the five-coordinate platinum complex is bipyramidal with anionic ligands in apical positions and the olefinic double bond in the equatorial plane. Some general features of the addition process, and the structural and NMR properties of the complexes, are also discussed.