期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 118, 期 19, 页码 3503-3513出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp5021559
关键词
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资金
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University [201410]
- Key Laboratory of Advanced Scientific Computation, Xihua University [szjj2013-024]
- National Natural Science Foundation of China [91016002]
- Shenzhen Science and Technology Research Grant [JCYJ20120613115247045]
- Shenzhen Research Institute, City University of Hong Kong
The water-mediated neutral hydrolysis mechanism of carbonyl sulfide (OCS) has been re-examined using the hybrid supramolecule/continuum models with n = 2-8 explicit water cluster at the level of MP2(fc)(CPCM)/6-311++G(d,p)//MP2(fc)(CPCM)/6-31+G(d). Present calculations indicate that the potential energy surface in water solution is different from the one in the gas-phase, and only stepwise mechanism is observed in aqueous solution, i.e., monothiocarbonic acid (H2CO2S) is formed via monothiocarbonate (OCSOH-, MTC) and its counterion, protonated water cluster, (H2O)(n)H3O+. The predicted rate-determining step (RDS) barrier for the stepwise mechanism in water solution, about 90 kJ/mol, shows good agreement with the experimental values, 83.7-96.2 kJ/mol using six- or eight-water model including two cooperative water molecules. Moreover, two reaction pathways, the nucleophilic addition of water molecule across the C=O or the C=S bond of OCS are competitive.
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