A comparison of two empirical pK_a(T) equations from 298 to 448 K for 2,9-Dimethyl-1,10-phenanthroline

Abstract

The two most commonly used three-term equation^1,2 describing the variation of pK_a with temperature are compared over the range 298-448 K for 2,9-dimethyl-1,10-phenanthroline. Both equations represent the data equally well over the experimental temperature range. First-difference calculations and the Σ-plot method are used to fit the data.