A Gaussian-2 ab initio study of CH2SH, CH2S -, CH3S-, CH2SH-, CH 3 +, and CH3SH+
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香港中文大學研究人員

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摘要Using the Gaussian-2 (G2) theoretical procedure, we have examined the molecular structures and total energies for CH2SH, CH 2S-, CH3S-, CH2SH -, CH3SH-, CH3 +, and CH3SH+. Contrary to the relative stabilities of CH 3S+(C3v;3A2) and CH 2SH+(Cs;1A′), the methylthio radical CH3S(Cs;2A′) and the methylthio anion CH3S-(C3v;1A1) are predicted to be more stable than the mercaptomethyl radical CH 2SH(C1;2A) and the mercaptomethyl anion CH 2SH-(Cs 1A′) by 9.2 and 38.0 kcal/mol, respectively. The CH2SH-(Cs; 1A′) anion may exist in the cis configuration or the less stable trans structure. Combined with the results of previous G2 calculations, this calculation yields predictions for the adiabatic ionization energies (IE) of CH3 (9.79 eV), CH2SH (7.41 eV), and CH3SH (9.55 eV), which are in accord with the experimental IEs of 9.84 eV for CH 3, 7.536±0.003 eV for CH2SH, and 9.440 eV for CH3SH. The G2 values for the adiabatic electron affinities (EA) of CH2S, CH2SH to trans-CH2SH -(Cs;1A′), CH2SH to cis-CH2SH-(Cs;1A′), and CH3S are 0.38, 0.52, 0.61, and 1.86 eV, respectively. The EA(G2)'s of CH2S and CH3S also agree with the respective experimental values of 0.465±0.023, and 1.861±0.004 eV. We find that CH 3SH- is unstable with respect to the electron detachment channel CH3SH+e-. © 1992 American Institute of Physics.
著者Chiu S.-W., Li W.-K., Tzeng W.-B., Ng C.-Y.
期刊名稱Journal of Chemical Physics
出版年份1992
月份12
日期1
卷號97
期次9
出版社American Institute of Physics
出版地United States
頁次6557 - 6568
國際標準期刊號0021-9606
電子國際標準期刊號1089-7690
語言英式英語

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