XAFS CUMULANT AND LIGAND-EXCHANGE REACTION-RATE CONSTANT FOR METAL-ION IN AQUEOUS-SOLUTION

The EXAFS spectra of hydrated transition metal complexes have been obt ained for investigating the relation between the Debye-Waller factor, sigma(2), in EXAFS and the ligand exchange reaction rate constant, k(1 ), for the complexes in aqueous solution. The relation between sigma(2 ) and log k(1) is studied by use of the Arrhenius theory. The introduc tion of the anharmonic Morse function as the interaction potential is found to lead to a simple expression connecting them.