AU-197 MOSSBAUER-SPECTRA OF 2-COORDINATE,3-COORDINATE, AND 4-COORDINATE GOLD(I) COMPLEXES

The 197Au Mössbauer parameters of [Au(PPH3)n]ClO4 (n = 2,3,4) are consistent with linear, trigonal, and tetrahedral two-, three-, and four-coordination for the gold atom. Change in the coordination number gives rise to a very large variation in isomer shift. The four-coordinate complex shows no quadrupole splitting. The near equality of the quadrupole splittings of the other two compounds is rationalised on the basis of simple models. © 1979.