New thiosulfato complexes of osmium

Abstract

The reactions of the complex [OsO₂(S₂O₃)₂]^2– with a variety of inorganic and organic ligands have been studied and the vibrational spectra and structures of the resulting compounds are discussed. They include the new complexes [OsO₂(S₂O₃)₂L₂]^2–[L = pyridine (py), 4-tert-butylpyridine, ½ 1,10-phenanthroline or N,N,N′,N′-tetramethylethylenediamine] and [OsO₂(py)₃(S₂O₃)]. X-Ray photoelectron data are reported for some of them. The X-ray crystal structure of one of the products, [NBuⁿ₄][Os(H₂O)(S₂O₃)₂(PMe₂Ph)₃], reveals an octahedral geometry around the osmium atom with the two trans S-bonded thiosulfate ligands adopting a syn geometry with respect to each other, each forming a strong hydrogen bond to the axial aqua ligand.