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题名: A comprehensive theoretical study on the hydrolysis of carbonyl sulfide in the neutral water
作者: Deng, Chao1, 2; Li, Qiang-Gen1, 2; Ren, Yi1, 2, 3; Wong, Ning-Bew3; Chu, San-Yan4; Zhu, Hua-Jie5
刊名: JOURNAL OF COMPUTATIONAL CHEMISTRY
关键词: carbonyl sulfide ; hydrolysis mechanism ; natural population analysis ; solvent effects ; temperature effects
英文摘要: The detailed hydration mechanism of carbonyl sulfide (COS) in the presence of up to five water molecules has been investigated at the level of HF and MP2 with the basis set of 6-311++G(d, p). The nucleophilic addition of water molecule occurs in a concerted way across the C=S bond of COS rather than across the C=O bond. This preferential reaction mechanism could be rationalized in terms of Fukui functions for the both nucleophilic and electrophilic attacks. The activation barriers, Delta H-298(not equal) for the rate-determining steps of one up to five-water hydrolyses of COS across the C=S bond are 199.4, 144.4, 123.0, 115.5, and 107.9 kJ/mol in the gas phase, respectively. The most favorable hydrolysis path of COS involves a sort of eight-membered ring transition structure and other two water molecules near to the nonreactive oxygen atom but not involved in the proton transfer, suggesting that the hydrolysis of COS can be significantly mediated by the water molecule(s) and the cooperative effects of the water molecule(s) in the nonreactive region. The catalytic effect of water molecule(s) due to the alleviation of ring strain in the proton transfer process may result from the synergistic effects of rehybridization and charge reorganization from the precoordination complex to the rate-determining transition state structure induced by water molecule. The studies on the effect of temperature on the hydrolysis of COS show that the higher temperature is unfavorable for the hydrolysis of COS. PCM solvation models almost do not modify the calculated energy barriers in a significant way. (C) 2007 Wiley Periodicals, Inc.
出版日期: 2008-02-01
卷号: 29, 期号:3, 页码:466-480
DOI标识: 10.1002/jcc.20806
语种: 英语
ISSN号: 0192-8651
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2941
Appears in Collections:植物化学与西部植物资源持续利用国家重点实验室_期刊论文

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作者单位: 1.Sichuan Univ, Coll Chem, Chengdu 610064, Peoples R China
2.Sichuan Univ, Key State Lab Biotherapy, Chengdu 610064, Peoples R China
3.City Univ Hong Kong, Dept Biol & Chem, Kowloon, Hong Kong, Peoples R China
4.Natl Tsing Hua Univ, Dept Chem, Hsinchu 30013, Taiwan
5.Chinese Acad Sci, Kunming Inst Bot, Organ Synth & Nat Prod Lab, Kunming 650204, Peoples R China

Recommended Citation:
Deng, C; Li, QG; Ren, Y; Wong, NB; Chu, SY; Zhu, HJ.A comprehensive theoretical study on the hydrolysis of carbonyl sulfide in the neutral water,JOURNAL OF COMPUTATIONAL CHEMISTRY,2008,29(3):466-480
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