Abstract
Iodine-129 Mossbauer spectra are reported for the complexes cis-[Ptl2L2], trans-[Ptl2L2], trans-[PtH(I)L2], [MI2(L–L)], [MI2(L–L)2], and A2[Pt2I6][M = Pd or Pt; L, L–L = tertiary phosphine, arsine, or stibine uni- or bi-dentate ligands; A = NEt4, C5H5NCH3, or P(CH2Ph)Ph3]. Data for the four-co-ordinate complexes are discussed in terms of the trans and cis influences of the neutral ligands. The Mossbauer-indicated cis influence is of comparable magnitude but opposite direction to the trans influence, but neither is directly related to the conventional cis and trans influences. For [MI2(L–L)2] the spectra indicate weak but significant interaction of the iodide with the metal atom. The spectra of the [Pt2I6]2– anions are consistent with bridged structures.
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