Abstract
Enthalpic variations in the formation of adenine nucleotide · manganese complexes, as measured by microcalorimetry, are reported. All the results are obtained in the temperature range 6–30°C at I = 0.2 and pH values 7.00 or 7.50. All the reactions are endothermic and the Δ H values increase with the length of the phosphate chain and with temperature. The Δ H values are compared with those previously obtained for adenine nucleotide · magnesium complexes. The comparison between calarimetric and potentiometric Δ H values is made. The divergence observed between these results at low temperature leads us to assume the formation of nucleotide aggregates induced by the presence of manganese ions. This hypothesis is confirmed by differential ultraviolet spectra.
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