Thermodynamic study of bromine evaporation from solid bi(iii) polybromides

Abstract The pressure of saturated and unsaturated bromine vapor over solid Bi(III) polybromides (PyH)3[Bi2Br9(Br2)] and (N-MePy)3[Bi2Br9(Br2)], where Py is pyridinium, N-MePy is N-methil pyridinium, has been measured for the first time in a wide temperature range using a static method with glass membrane-gauge manometers. As a result of this study the thermal stabilities of investigated complexes were established, the temperature dependences of bromine vapor pressure were obtained, the thermodynamic characteristics of bromine evaporation processes (ΔprH°T, ΔprS°T) were calculated and a new possibility for the synthesis of polybromides was proposed.