Palladium(II) and platinum(II) monoselenocarboxylates: Synthesis, spectroscopy, structure and their use as molecular precursors for metal selenides

摘要

Treatment of MCl2((PP)-P-boolean AND) or MCl2((PPr3)-Pr-n)(2) With two equivalents of ArCOSeK readily yields cis-[M(SeCOAr)(2)((PP)-P-boolean AND)] and trans[M(SeCOAr)(2)((PPr3)-Pr-n)(2)], respectively (M = Pd or Pt; Ar = Ph or 4-MeC6H4; (PP)-P-boolean AND = dppm, dppe, dppp). The reaction of Pd(SeCOAr)(2)(dppe) with PdCl2(dppe) in the presence of NaBPh4 in methanol gave a tri-nuclear ionic complex, [Pd-3(mu(3)-Se)(2)(dppe)(3)][BPh4](2). These complexes were characterized by UV-Vis, IR and NMR spectroscopy. The complex [Pt(SeCOPh)(2)(dppp)] has been structurally characterized by X-ray crystallography. The coordination environment around square planar platinum atom is defined by chelating dppp ligand and two unidentate selenocarboxylates bonded through selenium atoms. Pyrolysis of [Pd(SeCOAr)(2)((PPr3)-Pr-n)(2)] either in tri-n-butylphosphate (TBP) (at 200 degrees C) or in the solid state (furnace heating at 350 degrees C) gave Pd17Se15. (c) 2005 Elsevier B.V. All rights reserved.