Thermal stability and structures of gaseous GeB2O4 and GeMo2O7†
The stability of gaseous species GeB2O4 and GeMo2O7 was confirmed by Knudsen effusion mass spectrometry. The gas-phase reactions involving B2O3, Mo2O6, MoO3, GeB2O4 and GeMo2O7 were studied. On the basis of equilibrium constants, the standard formation and atomization enthalpies of gaseous GeB2O4 (−1101 ± 18 kJ mol−1 and 3600 ± 20 kJ mol−1) and GeMo2O7 (−1449 ± 41 kJ mol−1 and 4810 ± 43 kJ mol−1) at 298 K were determined. To get structure parameters and vibrational frequencies of gaseous GeB2O4 and GeMo2O7 quantum chemical investigation of these molecules was undertaken. Formation enthalpies of gaseous GeTaO3, GeTiO3, GeVO3 and GePO2 were estimated.