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Strength of the Benzene-Water Hydrogen Bond

机译:苯-水氢键的强度

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摘要

Very large basis set, correlated calculations of the benzene-water complex predict a geometry in which the water molecule sits above the aromatic ring with oxygen pointed away from the benzene center of mass. The purely electronic binding energy, in the complete basis set limit, was found to be -3.9 +- 0.2 kcal/mol, or only 20% weaker than the water-water interaction. When zero-point energies are included, the #DELTA#E_0(0 K) values are identical within their estimated uncertainties. Core/valence and higher-order correlation recovery via coupled cluster calculations were found to play a minor role. The present #DELTA#E_0(0 K) value of -2.9 +- 0.2 kcal/mol is in good agreement with a recent threshold photoionization experiment that yielded -2.4 +- 0.1 kcal/mol.
机译:苯-水配合物的非常大的基集,相关计算可预测一种几何结构,其中水分子位于芳环上方,氧指向远离苯质心的位置。在完全的基准设定极限中,发现纯电子结合能为-3.9±0.2kcal / mol,或仅比水-水相互作用弱20%。当包含零点能量时,#DELTA#E_0(0 K)值在其估计的不确定性内相同。发现通过耦合聚类计算得到的核/价和高阶相关性恢复起着较小的作用。当前的#DELTA#E_0(0 K)值为-2.9 +-0.2 kcal / mol与最近的阈值光电离实验相吻合,该实验产生了-2.4 +-0.1 kcal / mol。

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