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Correlations between experimental and theoretical adiabatic ionization energies for organic compounds and rate constants for atmospheric reactions with hydroxyl radicals

机译:有机化合物的实验绝热电离能与理论绝热电离能之间的相关性以及与羟基发生大气反应的速率常数

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摘要

Adiabatic ionization energy (AIE) calculations were performed at the AM1, PM3, PM6, PDDG, HF/QZVP, and B3LYP/QZVP levels of theory on 722 atmospherically relevant organic compounds with available experimental rate constants for atmospheric reactions with hydroxyl radicals (k~OH~). From the starting set of molecules, a final suite of 114 mono- and polyfunctionalized compounds provided converged neutral and cationic geometries without imaginary frequencies for all six levels of theory. NIST evaluated AIEs were available for 54 compounds, providing mean absolute AIE prediction errors of 0.31 (AM1), 0.28 (PM3), 0.50 (PM6), 0.36 (PDDG), 1.22 (HF/QZVP), and 0.20 eV (B3LYP/QZVP). Modest correlations were found between the experimental (r=-0.68, SE=0.81) and computationally estimated (r=-0.77 [AM1], -0.75 [PM3], -0.83 [PM6], -0.79 [PDDG], -0.83 [HF/QZVP], and -0.82 [B3LYP/QZVP]; SE=0.75 [AM1], 0.78 [PM3], 0.66 [PM6], 0.73 [PDDG], 0.67 [HF/QZVP], and 0.68 [B3LYP/QZVP]) AIEs and the corresponding experimental log k~OH~. Univariate AIE versus k~OH~ correlations are of lower predictive ability than state-of-the-art multivariate techniques, and are limited by the inability to calculate reliable AIEs for large numbers of atmospherically relevant compounds due either to convergence failures at various levels of theory or the presence of imaginary frequencies for converged cationic geometries.
机译:在AM1,PM3,PM6,PDDG,HF / QZVP和B3LYP / QZVP的理论水平上,对722种与大气相关的有机化合物进行了绝热电离能(AIE)计算,并获得了与羟基自由基(k〜哦〜)从一组分子开始,最终的114种单官能团和多官能团化合物提供了中性和阳离子几何形状的融合,而在所有六个理论水平上都没有想象的频率。 NIST评估的AIE可用于54种化合物,提供的平均绝对AIE预测误差为0.31(AM1),0.28(PM3),0.50(PM6),0.36(PDDG),1.22(HF / QZVP)和0.20 eV(B3LYP / QZVP) )。在实验(r = -0.68,SE = 0.81)和计算得出的估计值(r = -0.77 [AM1],-0.75 [PM3],-0.83 [PM6],-0.79 [PDDG],-0.83 [ HF / QZVP]和-0.82 [B3LYP / QZVP]; SE = 0.75 [AM1],0.78 [PM3],0.66 [PM6],0.73 [PDDG],0.67 [HF / QZVP]和0.68 [B3LYP / QZVP] )和相应的实验对数k〜OH〜。单变量AIE与k〜OH〜的相关性比最新的多元技术的预测能力低,并且由于无法计算大量与大气相关的化合物的可靠AIE而受到限制,这归因于不同水平的会聚失败。理论或虚构频率对于聚合阳离子几何形状的存在。

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    Sierra Rayne; Kaya Forest;

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  • 年度 2010
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  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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