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Li Q, An X, Gong B, Cheng J: Cooperativity between OH..O and CH...O hydrogen bonds involving dimethyl sulfoxide-H2O-H2O complex.. J Phys Chem A. 2007 Oct 11;111(40):10166-9. Epub 2007 Sep 14.
The cooperativity between the O-H...O and C-H...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...O and C-H...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...O H-bond is larger than that of the O-H...O H-bond due to the cooperativity. The solvent has a weakening effect on the cooperativity. |
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