TRIORGANOPHOSPHINEGOLD(I) CARBONIMIDOTHIOATES

The title compounds, R3PAuSC(=NPh)OR', R = Et, Ph or Cy and R' = Me, Et, Pr, Pr(i) or Cy, have been prepared and characterized by spectroscopic methods (i.r., H-1 and C-13 n.mr.r. and f.a.b. mr.s.) and, in the case of the R = Ph and R' = Me compound, by single-crystal X-ray diffraction methods. The spectroscopic data are consistent with the R3PAu moiety being coordinated by the sulfur atom of the thiolate ligand. This has been confirmed by an X-ray study on Ph3PAuSC(=NPh)OMe which shows the gold atom to be linearly coordinated by the phosphorus and sulfur atoms; Au-P(1) 2.258(1), Au-S(1) 2-301(1) A and P-Au-S 177.7(1)-degrees. Crystals of Ph3PAuSC(=NPh)OMe are triclinic, space group P1BAR, with unit cell dimensions: a 10.825(1), b 12.553(2), c 8.914(2) angstrom, a 97.86(2), beta 93.79(1), gamma 88-60(1)-degrees, V 1197.1 angstrom3, Z 2. The structure was refined by a full-matrix least-squares procedure to R 0.028 for 4409 reflections with I greater-than-or-equal-to 2.5sigma(I).