首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Regulating function of methyl group in strength of CH center dot center dot center dot O hydrogen bond: A high-level ab initio study
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Regulating function of methyl group in strength of CH center dot center dot center dot O hydrogen bond: A high-level ab initio study

机译:甲基对CH中心点中心点中心点O氢键强度的调节作用:高级从头算研究

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An ab initio computational study of the regulating function of the methyl group in the strength of the CH center dot center dot center dot O hydrogen bond (HB) with XC equivalent to C-H (X = H, CH3, F) as a HB donor and HOY (Y = H, CH3, Cl) as a HB acceptor has been carried out at the MP2/aug-cc-pVDZ and MP2/aug-cc-pVTZ levels. The bond lengths, interaction energies, and stretching frequencies are compared in the gas phase. The results indicate that the methyl substitution of the proton acceptor strengthens the CH center dot center dot center dot O HB, whereas that of the proton donor, weakens the C HB. NBO analysis demonstrates that the methyl group of the proton acceptor is electron-withdrawing and that of the proton donor is electron-donating in the formation of the CH center dot center dot center dot O HB. The electron-donation of the methyl group in the proton acceptor plays a positive contribution to the formation of the CH center dot center dot center dot O HB, whereas the electron-withdrawing action of the methyl group in the proton donor plays a negative contribution to the formation of the CH center dot center dot center dot O HB. The positive contribution of methyl group in the proton acceptor is larger than the negative contribution of methyl group in the proton donor.
机译:从头算计算研究甲基在CH中心点中心点中心点O氢键(HB)强度中的调节作用,其中XC等于CH(X = H,CH3,F)作为HB供体,已在MP2 / aug-cc-pVDZ和MP2 / aug-cc-pVTZ水平上进行了HOY(Y = H,CH3,Cl)作为HB受体的操作。在气相中比较了键长,相互作用能和拉伸频率。结果表明,质子受体的甲基取代增强了CH中心点中心点中心点中心点O HB,而质子供体的甲基取代点则削弱了C HB。 NBO分析表明,在CH中心点中心点中心点O HB的形成中,质子受体的甲基是吸电子的,质子供体的甲基是给电子的。质子受体中甲基的电子给体对CH中心点中心点中心点O HB的形成起正作用,而质子给体中甲基的吸电子作用对CH中心点中心点中心CH中心点中心点中心点O HB的形成。质子受体中甲基的正贡献大于质子供体中甲基的负贡献。

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