σπ Model in the Atom-bond Electronegativity Equalization Method and Its Applications

Abstract

Abstract: Based on density functional theory and electronegativity equalization principle, a σπ model, which considers the structure of double bond for the first time, is developed. In this model the double bond is partitioned into one σ bond region and four π bond regions. The atom-bond electronegativity equalization method plus σπ model(ABEEM σπ ) is then proposed for the calculation of charge distribution and charge polarization in large molecules. It has been shown that the results of charge distribution in large molecules obtained by ABEEM σπ model agree with those obtained by ab initio method very well. In addition, the model can be used to explain the region-selectivity of Diels-Alder reaction successfully. All these indicate that ABEEM σπ model is reasonable and reliable.

Key words: Density functional theory, Electronegativity equalization method, Charge distribution, Double bond, Region-selectivity

CLC Number:

O641

TrendMD:

YANG Zhong-Zhi, CONG Yao, WANG Chang-Sheng . σπ Model in the Atom-bond Electronegativity Equalization Method and Its Applications[J]. Chem. J. Chinese Universities, 1999, 20(11): 1781.

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σπ Model in the Atom-bond Electronegativity Equalization Method and Its Applications

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