气态镓钼酸盐和钨酸盐的热力学性质。

Thermodynamic properties of the gaseous gallium molybdates and tungstates.

机构信息

Department of Chemistry, St. Petersburg State University, 198504 St. Petersburg, Russia.

出版信息

J Phys Chem A. 2009 Dec 3;113(48):13469-74. doi: 10.1021/jp903619g.

PMID:19831372

Abstract

A number of gaseous oxyacid salts have been identified by Knudsen effusion mass spectrometry by vaporizing Ga(2)O(3) from molybdenum and tungsten cells. The stability of gaseous molecules Ga(2)MoO(4), Ga(2)WO(4), Ga(2)Mo(2)O(7), and Ga(2)W(2)O(7) was deduced from the measurements. The structures and molecular parameters of all salts investigated were obtained using quantum chemical calculations. On the basis of equilibrium constants measured for gas-phase reactions, the standard formation enthalpies were determined to be -827 +/- 26, -843 +/- 26, -1578 +/- 32, and -1525 +/- 34 kJ.mol(-1) for Ga(2)MoO(4), Ga(2)WO(4), Ga(2)Mo(2)O(7), and Ga(2)W(2)O(7), respectively.

摘要

通过在钼和钨舟中蒸发 Ga(2)O(3)，用 Knudsen 逸出质谱法鉴定了许多气态含氧酸盐。从测量结果推断出气态分子 Ga(2)MoO(4)、Ga(2)WO(4)、Ga(2)Mo(2)O(7)和 Ga(2)W(2)O(7)的稳定性。使用量子化学计算获得了所研究的所有盐的结构和分子参数。根据气相反应测量的平衡常数，确定 Ga(2)MoO(4)、Ga(2)WO(4)、Ga(2)Mo(2)O(7)和 Ga(2)W(2)O(7)的标准生成焓分别为-827 +/- 26、-843 +/- 26、-1578 +/- 32 和-1525 +/- 34 kJ.mol(-1)。