The thermodynamic properties of iron(II) bromide and perchlorate complexes with 4-amino-1,2,4-triazole

The heat capacity of iron(II) bromide and perchlorate complexes with 4-amino-1,2,4-triazole with the 1 A 1 ⇔ 5 T 2 spin transition was studied in the temperature ranges 8-346 and 57-331 K, respectively. Measurements wereperformed on a vacuum adiabatic calorimeter. The thermodynamic parameters of the phase transition in the complexes were determined.