MOSSBAUER STUDY OF SOME FE-CONTAINING M-6 AND M-5 CLUSTERS

Isomer shift (δ) and quadrupole splitting (Δ) parameters have been assigned to the iron sites in [FeRh5(CO)16]−, trans- and cis-[Fe2Rh4(CO)16]2−, [Fe3-Rh3(CO)17]3−, [FeRh4(CO)15]2−, [Fe3Pt3(CO)15]2− and [Fe4M(CO)16]2− (M = Pd or Pt) from 57Fe Mössbauer spectra recorded at 78 K. The data for the closo compounds [FeRh5(CO)16]− and [Fe2Rh4(CO)16]2− are compared with those for [Fe6(CO)16C]2−. In [Fe3Rh3(CO)17]3−, the three major Fe sites were identified. For both [Fe4M(CO)16]2− compounds two isomers were shown to be present in the solid state.