FORMATION OF PT(CH3)(CF3) (DIOLEFIN) FROM PT(CH3)2(DIOLEFIN) AND CF3I (DIOLEFIN = NBD, NORBORNADIENE, OR COD, 1,5-CYCLOOCTADIENE) - THE CRYSTAL-STRUCTURES OF (ETA-4-NORBORNADIENE)(METHYL)(TRIFLUOROMETHYL)-PLATINUM(II) AND (ETA-4-NORBORNADIENE)BIS(TRIFLUOROMETHYL)PLATINUM(II)

Reaction between Pt(CH3)2(diolefin) (diolefin = norbornadiene (NBD); 1,5-cyclooctadiene (COD)) and two mole equivalents of CF3I produces, in addition to the previously reported products Pt(CF3)2(diolefin) (2) and [Pt(CH3)3I]4, the mixed alkyl compound Pt(CH3)(CF3)(diolefin) (1). The crystal structure of Pt(CH3)(CF3)(NBD) (1a) has been determined, together with that of Pt(CF3)2(NBD) (2a) for comparison. The complexes are isomorphous and isostructural. The Pt-C (CH3) and Pt-C (CF3) bond distances in la are similar (each 2.07(2) angstrom), and are similar to the Pt-C distance in 2a. The Pt-C (norbornadiene) distances likewise show only slight differences (means 2.23(2) (1a), 2.26(4) angstrom (2a)).