Summary
OsO4 reacts with imidazolidine-2-thione and itsN-methyl andN-ethyl derivatives in acidified 1∶1 vol. H2O:EtOH to give [OsL6]3+. Complexes obtained in the presence of HClO4 or HBF4 have been isolated as crystals and characterized by elemental analysis, i.r. spectroscopy and magnetic measurements.
All the ligands bind the metal through the sulphur atom and the magnetic measurements are consistent with low spin osmium(III). The kinetics of [OsL6]3+ formation has been followed spectrophotometrically. Thepseudo-first order rate constants are linear both with respect to the acid and the ligand concentrations, indicating that the kinetically significant process involves one proton and one molecule of the ligand. A comparison of these results with those obtained for the analogous reaction with thiourea is reported.
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Cristiani, F., Devillanova, F.A., Diaz, A. et al. Complexes of osmium (III) obtained from OsO4 and ethylenethioureas. A kinetic study of the reduction in HClO4 solutions. Transition Met Chem 7, 69–71 (1982). https://doi.org/10.1007/BF00618184
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DOI: https://doi.org/10.1007/BF00618184