The complex [Ru(EDTA)(H20lr undergoes substitution reactions with several ligands
Chapter 24, Problem 24.82(choose chapter or problem)
The complex [Ru(EDTA)(H20lr undergoes substitution reactions with several ligands, replacing the water molecule with the ligand. [Ru(EDTA)(H20Jr + L -----+ [Ru(EDTA)Lr + H20 The rate constants for several ligands are as follows: Ligand, L Pyridine SCNCH3CN 6.3 X 103 2.7 X 10 2 3.0 X 10 (a) One possible mechanism for this substitution reaction is that the water molecule dissociates from the complex in the rate-determining step, and then the ligand L fills the void in a rapid second step. A second possible mechanism is that L approaches the complex, begins to form a new bond to the metal, and displaces the water molecule, all in a single concerted step. Which of these two mechanisms is more consistent with the data? Explain. (b) What do the results suggest about the relative basicities of the three ligands toward Ru(III)? (c) Assuming that the complexes are all low spin, how many unpaired electrons are in each?
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