SCHEDULED MAINTENANCE
Polarography of some rhodium(III) complexes
Abstract
The redox behaviour of a number of rhodium(III) complexes has been examined by d.c. polarography. The complexes undergo two-electron reduction at the dropping mercury electrode (d.m.e.), those with aza-aromatic ligands being reduced at significantly more positive potentials than their counterparts with amine or acyclic amine ligands. Superoxo- and peroxo-bridged dirhodium(III) complexes exhibit polarographic behaviour comparable to µ-peroxo-dicobalt(III) complexes. Replacement of two ethylenediamine ligands by four pyridine ligands increases the E½ value for CoIII, RhIII, and IrIII complexes and renders the RhIII complexes susceptible to ethanol acceleration of their substitutions.
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