Borate-polyol complexes in aqueous solution: determination of enthalpies by thermometric titrimetry.
Enthalpies for the reaction of borate with 1,2-ethanediol, 1,2-propanediol, 1,2,3-propanetriol and d-mannitol have been determined by thermometric titrimetry. From these enthalpies and equilibrium constants taken from the literature, corresponding entropies have been calculated. The data refer to aqueous solutions at 25 degrees and I = 1.0M (NaNO(3)). The results indicate reasons for the differences in the stabilities of the complexes.
Aruga
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Institute of Analytical Chemistry, University of Turin, via Giuria 5, 10125 Turin, Italy.