Browsing by Subject "Bridging ligands"

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  • Schlindwein, Simon H.; Sibold, Carlo; Schenk, Mareike; Ringenberg, Mark R.; Feil, Christoph M.; Nieger, Martin; Gudat, Dietrich (2020)
    The ability of 3-(diphenylphosphinomethyl)-benzene-1,2-dithiol (pbdtH(2)) to act as ditopic ligand was probed in reactions with selected group-10-metal complexes. Reactions with [(cod)PdCl2] afforded a mixture of products identified as [Pd(pbdtH)(2)], [Pd-2(mu(2)-pbdt)(2)] and [Pd-3(mu(2)-pbdt)(2)Cl-2]. The polynuclear complexes could be isolated after suitably adjusting the reaction conditions, and heating of a mixture in a microwave reactor effected partial conversion into a further complex [Pd-3(mu(2)-pbdt)(3)]. Reaction of pbdtH(2) with [Ni(H2O)(6)Cl-2] gave rise to a complex [Ni-2(mu(2)-pbdt)(2)], which was shown to undergo two reversible 1e(-)-reduction steps. Reaction of [Pd(pbdtH)(2)] with [Au(PPh3)Cl] afforded heterotrinuclear [PdAu2(mu(2)-pbdt)(2)(PPh3)]. All complexes were characterized by analytical, spectroscopic and single-crystal X-ray diffraction studies. Their molecular structures confirm the ability of the pbdt(2-) unit to support simultaneous P,S- and S,S-chelating coordination to two metal centers.
  • Schlindwein, Simon H.; Nieger, Martin; Gudat, Dietrich (2021)
    Reaction of a phosphane-decorated benzenedithiol (pbdtH(2)) with coinage metal salts furnished polynuclear complexes [M-2(pbdtH)(2)] (M=Au-I) or [cat][M-5(pbdt)(3)] (cat=unipositive cation, M=Ag-I, Cu-I), which were characterized by analytical and spectroscopic techniques and single-crystal X-ray diffraction studies. Furthermore, a double salt with an anion [Ag-5(pbdt)(3)(PPh3)](-) that proved unstable in solution was characterized crystallographically. The spectroscopic and crystallographic data revealed that the Cu(I) and Ag(I) complexes exhibit, despite their like stoichiometric composition, isomeric molecular structures. The observed disparities were reproduced by DFT studies. The dinuclear Au(I) complex was found to undergo air-oxidation to furnish a mixed-valent complex [(Au-III)(2)(Au-I)(2)(pbdt)(4)]. The copper(I) - but not the isomeric silver(I) complexes - showed luminescence in the solid state.