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Abstract
The aquation kinetics of [Co(Py)4Cl2]X salts (X=Cl−, NO 3 − , IO 4 − , ClO 4 − , SCN− and N 3 − ) in EtOH/H2O have been widely investigated over a range of solvent compositions. Similarly, the aquation rate constants were determined in aqueous solution (1∶1 v/v) containing other organic solvents. The study reveals the existence of specine solvation of the activated complex and that the rate constant associated with the rate-determining step of the reaction depends to some extent on the ionizing power of the medium. The influence of the counter ions on the aquation rate is also discussed. Basicity, the capacity of the nucleophiles to abstract the exchangeable proton from a titanium selenite inorganic exchanger was found to follow the order: SCN−<NO 3 − <Cl−<ClO 4 − <IO 4 − <N 3 − .
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