Thermodynamics of chelation. I. Iron(II) and zinc(II) complexes of Pyridine-2-aldehyde-2'-pyridylhydrazone

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Abstract
In dilute solution, pyridine-2-aldehyde-2'-pyridylhydrazone can behave as a diacid base or as a tridentate chelating agent. Its cationic bis complexes further undergo two stages of deprotonation. Equilibrium constants have been measured at seven temperatures from 5� to 60� and over a range of ionic strength. They have been used to derive values of enthalpies and entropies of reaction with H+, Fe2+, and Zn2+.

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