Equilibria in complexes of N-heterocyclic molecules. Part 8. Reaction of tris(5-nitro-1,10-phenanthroline)ruthenium(II) cation with methoxide and ethoxide ions
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 10,p. 1039-1044
- https://doi.org/10.1039/dt9770001039
Abstract
Spectroscopic studies show that methoxide ion reacts reversibly with methanolic solutions of the tris(5-nitro-1,10-phenanthroline)ruthenium(II) cation, [RuL3]2+, via addition to the 2 position of each heterocyclic ligand. An analogous addition occurs with ethoxide ion in ethanol, except that with excess of [OEt]– the diethoxy-adduct is precipitated. The kinetics of addition of the first alkoxide ion have been examined in both cases. With methoxide ion the observed rate law, Rate =k1[Ru][OMe–]+k–1[Ru], allows evaluation of both forward and reverse rate constants. For ethoxide ion a simple second-order rate law, Rate =k1[Ru][OEt–], is observed. Comparison with similar data for the related additions of [OH]– and [CN]– ions to [RuL3]2+ shows the relative rate order [OEt]– > [OMe]– [OH]– [CN]–.Keywords
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