Significant discrepancies between van't Hoff and calorimetric enthalpies. II

Protein Science : a Publication of the Protein Society
Y Liu, J M Sturtevant

Abstract

Isothermal calorimetric titration of 18-crown-6 ether with BaCl2 in pure aqueous solution over the temperature range 7-40 degrees C gives precise binding constants and enthalpy changes. Nonlinear least-squares fitting of the binding constants to the integrated van't Hoff equation, including a temperature-independent change in heat capacity, leads to van't Hoff enthalpies that differ significantly from the observed calorimetric enthalpies. This perplexing discrepancy appears at present to be very widely occurring.

References

Jun 6, 1995·Proceedings of the National Academy of Sciences of the United States of America·H NaghibiJ M Sturtevant

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