PENTAFLUOROPHENYLPHOSPHINE COMPLEXES OF PLATINUM(II) - CRYSTAL-STRUCTURE OF TRANS-[PTCL2(PET3)(PPH2(C6F5))]

The reactions between the pentafluorophenylphosphines PPhx(C6F5)(3-x)( x = 0-2) and the dimeric platinum(II) species [{Pt(PEt3)Cl(mu-Cl)}(2)] yielded the complexes trans-[PtCl2(PEt3){PPhx(C6F5)(3-x)}] (x = 0 1, 1 2 or 2 3). The molecular structure of complex 3 has been determined by single-crystal X-ray crystallography, it crystallizes in the tricli nic space group <P(1)over bar> with Z = 4 with two independent molecul es in the asymmetric unit, a = 12.067(2), b = 14.131(1), c = 16.393(2) Angstrom, alpha = 76.92(1), beta = 79.08(1), gamma = 89.40(1)degrees. Variable-temperature F-19 NMR spectroscopic studies, performed at 282 .41 MHz, were carried out and showed that there is hindered rotation a bout the P-C6F5 bonds of complex 1, which was frozen out at 197 K. The re was no evidence of hindered rotation about the P-C bonds of complex es 2 and 3 down to 184 K.