The complex [Ru(EDTA)(H₂O)]^- undergoes substitution reac-tions with several ligands, replacing the water molecule with the ligand. In all cases the ruthenium stays in the +3 oxidation state and the ligands use a nitrogen donor atom to bind to the metal.

The rate constants for several ligands are as follows:

Ligand, L ………. k (M^-1s^-1)

Pyridine …………. 6.3 × 10³

SCN^- …………….. 2.7 × 10²

CH₃CN …………… 3.0 × 10

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[Ru(EDTA)(H,O)]¯ + L → [Ru(EDTA)L]¯ + H,O