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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Cooperativity between OH center dot center dot center dot O and CH center dot center dot center dot O hydrogen bonds involving dimethyl sulfoxide-H2O-H2O complex
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Cooperativity between OH center dot center dot center dot O and CH center dot center dot center dot O hydrogen bonds involving dimethyl sulfoxide-H2O-H2O complex

机译:涉及二甲基亚砜-H2O-H2O配合物的OH中心点中心点中心点O和CH中心点中心点中心点O之间的协同作用

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摘要

The cooperativity between the O-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds has been studied by quantum chemical calculations at the MP2/6-311++G(d,p) level in gaseous phase and at the B3LYP/6-311++G(d,p) level in solution. The interaction energies of the O-H center dot center dot center dot O and C-H center dot center dot center dot O H-bonds are increased by 53 and 58%, respectively, demonstrating that there is a large cooperativity. Analysis of hydrogen -bonding lengths, OH bond lengths, and OH stretching frequencies also supports such a conclusion. By NBO analysis, it is found that orbital interaction plays a great role in enhancing their cooperativity. The strength increase of the C-H center dot center dot center dot O H-bond is larger than that of the O-H center dot center dot center dot O H-bond due to the cooperativity. The solvent has a weakening effect on the cooperativity.
机译:通过在气相中MP2 / 6-311 ++ G(d,p)能级的量子化学计算研究了OH中心点中心点中心点O和CH中心点中心点中心点O之间的协同作用。在溶液中的B3LYP / 6-311 ++ G(d,p)水平。 O-H中心点中心点中心点O和C-H中心点中心点中心点O H-bond的相互作用能分别增加了53%和58%,表明存在较大的协同性。对氢键长度,OH键长度和OH拉伸频率的分析也支持这一结论。通过NBO分析,发现轨道相互作用在增强它们的合作性方面起着重要作用。由于协作,C-H中心点中心点中心点O H-bond的强度增加大于O-H中心点中心点中心点O H-bond的强度增加。溶剂对协同作用具有弱化作用。

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