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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Acidity constants of some sulfur oxoacids in aqueous solution using CCSD and MP2 methods
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Acidity constants of some sulfur oxoacids in aqueous solution using CCSD and MP2 methods

机译:使用CCSD和MP2方法测定某些含氧含氧酸在水溶液中的酸度常数

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The calculations of the acidity constants (pK_a) of a series of sulfur oxoacids including H_2SO_n (n = 1-5) and H _2S_2O_n (n = 1, 3, 4, 6 and 7) are presented for the first time. The calculations were performed using two expensive correlated levels of theory including MP2/6-311++G(3df,3pd) and CCSD/6-311++G(d,p) in both gas and aqueous phases. The new continuum solvation model, SMD, based on the quantum mechanical charge density of a solute molecule interacting with a continuum description of the solvent, used to account the solvent effects. The calculated pK_as were corrected using the different correlation equations (Zimmermann and Tossell, J. Phys. Chem. A, 2009, 113, 5105-5111) to improve the accuracy of results. Also, the calculated results showed the effect of the intramolecular hydrogen bonding on the acidity strength.
机译:首次提出了包括H_2SO_n(n = 1-5)和H _2S_2O_n(n = 1、3、4、6和7)在内的一系列硫代含氧酸的酸度常数(pK_a)的计算。计算是使用两种昂贵的相关理论水平进行的,包括气相和水相中的MP2 / 6-311 ++ G(3df,3pd)和CCSD / 6-311 ++ G(d,p)。基于溶质分子与溶剂的连续描述相互作用的量子力学电荷密度,新的连续溶剂化模型SMD用于说明溶剂的影响。使用不同的相关方程式(Zimmermann and Tossell,J.Phys.Chem.A,2009,113,5105-5111)对计算出的pK_as进行校正,以提高结果的准确性。此外,计算结果显示了分子内氢键对酸度强度的影响。

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