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Thermochemistry of Aluminum Halides: A Theoretical Appraisal

机译:卤化铝的热化学:理论评估

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摘要

The Gaussian-2 (G2) ab initio procedure has been applied to gas-phase species of the formulas A1X↑(n+), A1XY↑(n+), and A1XYZ↑(n+) (n = 0, 1; X, Y, Z = F, Cl, Br). Existing thermochemical values for several of these species are highly uncertain, and many appear not to have been subjected to any previous study. The G2 results reported herein can be assessed against eight aluminum halides (namely A1F, A1Cl, A1F↑(+), A1F↓(i)Cl↓(3-i) (i = 0-3), and A1Br↓(3)) whose enthalpies of formation are known to an accuracy of ±10 kJ mol↓(-1) or better: in all cases, very good agreement is found between G2 and the literature values, while the literature values for several other species of uncertain thermochemistry are found to disagree with the G2 results despite large experimental uncertainties. In particular, we urge further experimental examination of the thermochemistry of A1F↓(2), A1FCl, and A1C1↓(2) and their molecular cations, for which the enthalpies of formation recommended in the JANAF thermochemical tables appear to be systematically too low.
机译:高斯2(G2)从头计算程序已应用于分子式为A1X↑(n +),A1XY↑(n +)和A1XYZ↑(n +)的气相物种(n = 0,1; X,Y, Z = F,Cl,Br)。这些物种中的几种的现有热化学值是高度不确定的,并且许多似乎没有进行过任何先前的研究。本文报告的G2结果可以针对八种卤化铝(即A1F,A1Cl,A1F↑(+),A1F↓(i)Cl↓(3-i)(i = 0-3)和A1Br↓(3)进行评估),其形成焓已知为±10 kJ mol↓(-1)或更高:在所有情况下,G2与文献值之间都找到了很好的一致性,而其他几种不确定热化学的文献值尽管存在较大的实验不确定性,但我们发现与G2结果不一致。特别是,我们敦促对A1F↓(2),A1FCl和A1C1↓(2)以及它们的分子阳离子的热化学性质进行进一步的实验检查,在JANAF热化学表中推荐的生成焓似乎过低。

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