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Int. J. Mol. Sci. 2007, 8(7), 572-582; doi:10.3390/i8070572

Electronegativity Equalization Method: Parameterization and Validation for Large Sets of Organic, Organohalogene and Organometal Molecule

National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kotlářská 2, 61137 Brno, Check Republic
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Received: 10 May 2007 / Revised: 6 June 2007 / Accepted: 14 June 2007 / Published: 3 July 2007
(This article belongs to the Section Physical Chemistry, Theoretical and Computational Chemistry)
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Abstract

The Electronegativity Equalization Method (EEM) is a fast approach for chargecalculation. A challenging part of the EEM is the parameterization, which is performedusing ab initio charges obtained for a set of molecules. The goal of our work was to performthe EEM parameterization for selected sets of organic, organohalogen and organometalmolecules. We have performed the most robust parameterization published so far. The EEMparameterization was based on 12 training sets selected from a database of predicted 3Dstructures (NCI DIS) and from a database of crystallographic structures (CSD). Each setcontained from 2000 to 6000 molecules. We have shown that the number of molecules inthe training set is very important for quality of the parameters. We have improved EEMparameters (STO-3G MPA charges) for elements that were already parameterized,specifically: C, O, N, H, S, F and Cl. The new parameters provide more accurate chargesthan those published previously. We have also developed new parameters for elements thatwere not parameterized yet, specifically for Br, I, Fe and Zn. We have also performedcrossover validation of all obtained parameters using all training sets that included relevantelements and confirmed that calculated parameters provide accurate charges.
Keywords: Charge distribution; Electronegativity Equalization Method; Parameterization; Organohalogenes; Organometals. Charge distribution; Electronegativity Equalization Method; Parameterization; Organohalogenes; Organometals.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Varekova, R.S.; Jirouskova, Z.; Vanek, J.; Suchomel, S.; Koca, J. Electronegativity Equalization Method: Parameterization and Validation for Large Sets of Organic, Organohalogene and Organometal Molecule. Int. J. Mol. Sci. 2007, 8, 572-582.

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