Synthesis, properties, and multinuclear nuclear magnetic resonance (1H, 77Se, and 195Pt) studies on diselenoether complexes of palladium, platinum, and rhodium

Abstract

The synthesis of [M(L–L)X₂](M = Pd or Pt; X = Cl, Br, or I) complexes of the diselenoethers, L–L = MeSeCH₂CH₂SeMe, PhSeCH₂CH₂SePh, o-C₆H₄(SeMe)₂, cis-MeSeCHCHSeMe, or MeSeCH₂CH₂CH₂SeMe, is reported. The complexes were characterised by microanalysis, i.r., and electronic spectroscopy, ¹H, ⁷⁷Se, and in some cases ¹⁹⁵Pt n.m.r. spectroscopy. The trends in the ⁷⁷Se chemical shifts and in ¹J(PtSe) with invertomer, metal, chelate ring size, and with the trans halide are discussed. The rhodium(III) complexes, [PPh₄][Rh(L′–L′)Cl₄], trans-[Rh(L′–L′)₂Cl₂]ClO₄, and cis-[Rh(L′–L′)₂Cl₂]Cl(L′–L′= MeSeCH₂CH₂SeMe), were similarly characterised, and ⁷⁷Se chemical shifts and ¹J(RhSe) are reported. A ring contribution, dependent upon the chelate ring size, has been identified in the ⁷⁷Se n.m.r. shifts.