title: Thermodynamic study of gaseous vanadium phosphates by high-temperature mass spectrometry.
abstract: Knowledge of the structures of gaseous oxyacid salts of the M(m) XO(n) type is of interest for understanding the nature of chemical bonds. Gaseous VPO(2) and VPO(3) have been identified by Knudsen effusion mass spectrometry during the vaporization of mixtures of V(2)O(3) and alkali earth phosphates from molybdenum and tungsten effusion cells. The structures and molecular parameters of the gaseous vanadium phosphates under study were determined using quantum chemical calculations. On the basis of equilibrium constants measured for gas-phase reactions, the standard formation enthalpies were determined to be -273 ± 17 and -615 ± 16 kJ·mol(-1) for VPO(2) and VPO(3), respectively.
authors.affiliation: Chemical Department, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russia. transformer2002@yandex.ru
authors.forename: S M
authors.initials: SM
authors.lastname: Shugurov
authors.forename: S I
authors.initials: SI
authors.lastname: Lopatin