Thermochemistry of Neutral and Charged Vapor Complexes over NaBr-LnBr₃ Systems

Abstract

The Knudsen effusion cell mass spectrometry and the density functional theory were used to study vapor species over the NaBr−LnBr 3 (Ln = La, Lu) binary systems. The complex molecules NaLnBr 4 , Na 2 LnBr 5 and both positive Na 2 LnBr 4 + , Na 3 LnBr 5 + and negative NaLnBr 5 − complex ions have been observed in saturated vapor in the temperature range 870 -1184 K (La) and 812 -1065 К (Lu) for the first time along with the molecules and ions inherent to the pure components. Molecular parameters and energy characteristics were obtained by quantumchemical calculations. The partial vapor pressures of neutral constituents have been obtained. The equilibrium constants of dissociation reactions of molecular and charged complexes were determined and the enthalpies of reactions have been calculated using the second and third laws of thermodynamics. Also the enthalpies of formation of complex molecules and ions have been obtained.

Vaporization Processes and Accurate Molecular Structure of a Number of Organic and Inorganic Compounds Promising for Use in Technologies Involving the Gas Phase

“…Бромиды и иодиды лантанидов Завершен цикл работ по термодинамике молекулярной и ионной сублимации бромидов и иодидов лантанидов [73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92]. Исследование этих соединений имеет важное прикладное значение в различных областях науки, техники и технологии.…”