A simple electronegativity method is used to calculate atomic charges for molecules of interest to biochemistry. These include purines, pyrimidines, and amino acids. Results are compared to those obtained from other theoretical methods (ab initio and semiempirical) as well as to nuclear magnetic res
A new model for calculating atomic charges in molecules
β Scribed by Johann Gasteiger; Mario Marsili
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- French
- Weight
- 218 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
Although the qualitative concept of partial charges of atoms in molecules is widely accepted and used among chemists, the assignment of quantitative values is met with difficulties. Experimental methods give only indirect access to atomic charges and different interpretations might result in varying numerical values. Various theoretical definitions have been offered but the magnitude of the values is dependent on the approach being taken. The most widely used method is the Mulliken population analysis'. But this definition has deficiencies and the results are heavily dependent on the wave function chosen. A number of
π SIMILAR VOLUMES
Modifications are made to a previously developed scheme for calculating atomic charge which uses orbital electronegativity and which requires minimal calculational effort. The introduced changes are a result of deficiencies noted in the earlier method which were due to an inadequate accounting of ef
For the calculation of atomic charges in molecules, a new fast procedure based on extended Mulliken population analysis is presented. The reliability of the new population analysis is tested within the AM1 approximation and the results are compared in detail with those obtained by different methods
A previously developed method for calculating atomic charge in neutral molecules is modified so as to account for charged molecular species. The method is based on the orbital electronegativity (EN) concept and utilizes an EN equalization principal. Since only one linear equation is required per bon