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1 1998

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Superoxo rhodium(III) complexes with higher carboxylic and amino-carboxylic acids as ligands

Moszner M., Ziółkowski J. J.

Polish Journal of Chemistry

1998

Vol. 72, nr 11

2357-2365

Replacement of H2O and/or OH(-) ligands in the [Rh2(O2(-))(OH)2(H2O)n](3+)cation by carboxylate ions: RCO2(-) (R=C2H5, C3H7, C4H9, (CH3)3), glycine, L-aspartic acid and L-proline have been studied by electronic and ESR spectra. Two new superoxo rhodium(III) carboxylates formulated as [Rh2(O2(-))(OH)(RCO2)4]n, (R=C2H5 (1), C3H7 (2)), have been synthesized in the reaction between the rhodium (III) superoxo hydroxide, assumed to be [Rh2(O2(-))(OH)2+m(H2O)n-m] with RCO2H. Reaction products were characterized by elemental analysis, UV-VIS, IR, ESR spetroscopies and magnetic susceptibility measurements. The results indicated the formation both the superoxo rhodium(III) carboxylates and amino-carboxylates, containing the [Rh2(O2(-))]5+ core of higher stability in the compounds with the amino-carboxylic acid anions.