Thermodynamic considerations in co-ordination. Part II. Protonations of 1,2-diaminoethane, 1,3-diaminopropane, 4(5)-aminomethylimidazole, 4(5)-2′-aminoethylimidazole, 2-aminomethylpyridine, and 2-2′-aminoethylpyridine

Abstract

A recording non-isothermal twin-Dewar microcalorimeter has been constructed so that titrations may be performed in it; it has been tested by measuring the heat of ionisation of water. The thermodynamic functions of six bases have been determined by combining the results of calorimetric studies with those obtained by pH-potentiometry. Their significance is discussed in terms of the hydration of species present in solution.