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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Vibrational Spectra of CO_2-Electron Donor-Acceptor Complexes from ab Initio
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Vibrational Spectra of CO_2-Electron Donor-Acceptor Complexes from ab Initio

机译:从头算CO_2-电子给体-受体配合物的振动光谱

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In this paper, we investigated the 1:1 EDA complexes of CO_2 formed with alcohols, namely, methanol and ethanol (sp~3 O-donating atom), and with acetone (sp~2 O-donating atom) in light of ab initio calculations. The interaction energy and the geometry of the complexes have been evaluated with the Moller-Plesset perturbation theory at the second-order level (MP2) using Dunning's basis sets. The predicted structures are found to be rather similar compared with the calculations at the SCF/3-21G~* level reported by Jamroz et al. (Jamroz, M. H.; Dobrowolski, J. C.; Bajdor, K.; Borowiak, M. A. J. Mol. Struct. 1995, 349, 9.). Nevertheless, the stabilization energies are found in our work to be 2 to 2.5 times lower including electron correlation. In addition, we have analyzed the vibrational spectra of these EDA complexes. In particular, we emphasized the splitting of the v_2 bending mode of CO_2 and the v_s(OH) stretching mode of alcohols or the antisymmetric v_a(CCC) and symmetric v_s(CO) stretching modes of acetone. Finally, the shift and the IR and Raman intensity variations under the complex formation are discussed and compared with infrared absorption and Raman experimental measurements.
机译:本文从头开始研究了由甲醇,乙醇(sp〜3 O供体原子)和丙酮(sp〜2 O供体原子)与醇形成的CO_2的1:1 EDA配合物。计算。相互作用能和配合物的几何形状已使用Dunning基组在二阶(MP2)上使用Moller-Plesset微扰理论进行了评估。与Jamroz等人报道的SCF / 3-21G〜*水平的计算结果相比,预测的结构非常相似。 (Jamroz,M.H。; Dobrowolski,J.C。; Bajdor,K; Borowiak,M.A.J.Mol.Struct.1995,349,9)。但是,在我们的工作中发现,包括电子相关性在内的稳定能要低2到2.5倍。此外,我们分析了这些EDA配合物的振动光谱。特别是,我们强调了CO_2的v_2弯曲模式和醇的v_s(OH)拉伸模式或丙酮的反对称v_a(CCC)和对称v_s(CO)拉伸模式的分裂。最后,讨论了复合物形成下的位移,IR和拉曼强度变化,并与红外吸收和拉曼实验测量结果进行了比较。

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