Energy Relaxation and Structural Dynamics of Protons in Water/DMSO Mixtures.

Energy Relaxation and Structural Dynamics of Protons in Water/DMSO Mixtures.
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DOI:
10.1021/acs.jpcb.8b06938
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发表时间:
2018-11-01
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
Bakker HJ
Bakker HJ
中科院分区:
其他
文献类型:
--
作者:
Sofronov OO;Bakker HJ

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We investigate the structure and dynamics of proton solvation structures in mixed water/dimethyl sulfoxide (DMSO) solvents using two-color mid-infrared femtosecond pump–probe spectroscopy. At a water fraction below 20%, protons are mainly solvated as (DMSO-H)+ and (DMSO-H)+-H2O structures. We find that excitation of the OH-stretch vibration of the proton in (DMSO-H)+-H2O structures leads to an ultrafast contraction of the hydrogen bond between (DMSO-H)+ and H2O. This excited state relaxes rapidly with T1 = 95 ± 10 fs and leads in part to a strong local heating effect and in part to predissociation of the protonated cluster into (DMSO-H)+ and water monomers.
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