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Abstract
From direct calorimetric measurements we have obtained the molar enthalpies, free energies and entropies of the precess of formation of chelates of the nitrilotripropionic acid with Mn(II), Ni(II), Cu(II) and Zn(II). The molar enthalpies corrected for the differences between the stabilization energies of the complexes and the respective aquocations are a linear function of the inverse radius. The corrected ∆S values show, therefore, a linear variation in relation to the inverse radius. The both events are an indication of the contribution of the ligand field stabilization energy to the molar enthalpie and to the formation entropy of the chelates.
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