Heat capacities and molar enthalpies and entropies of fusion for anhydrous 1,10-phenanthroline and 2,9-dimethyl-1,10-phenanthroline

Cp,m(phen,cr)/(J K−1 mol−1)=(−3905 ± 16) + (22.0 ± 1.0) (T/K)−(0.0289 ± 0.0015) (T/K)2 from 298.2 to 360.2 K, R2=0.9935;  Cp,m(dmphen,cr)/(J K−1 mol−1)=(−2808 ± 14)+(17.1 ± 1.0) (T/K)−(0.0229 ± 0.0014) (T/K)2 from 298.2 to 393.2K, R2=0.9953.In particular the Cp,m values at T = 298.15 K for phen and dmphen were found to be (115 ± 18 and 253 ± 30) J K−1 mol−1, respectively, where the associated uncertainties are twice the standard deviations of the mean.