Development of new methods for calculation of ionization constants of a number of Schiff base compounds using quantum mechanics methods
AL-Sayd Toohi, H., Al-Hyali, D. (2023). Development of new methods for calculation of ionization constants of a number of Schiff base compounds using quantum mechanics methods. EKB Journal Management System, 66(2), 93-100. doi: 10.21608/ejchem.2022.131308.5789
Homam AL-Sayd Toohi; Dalal Al-Hyali. "Development of new methods for calculation of ionization constants of a number of Schiff base compounds using quantum mechanics methods". EKB Journal Management System, 66, 2, 2023, 93-100. doi: 10.21608/ejchem.2022.131308.5789
AL-Sayd Toohi, H., Al-Hyali, D. (2023). 'Development of new methods for calculation of ionization constants of a number of Schiff base compounds using quantum mechanics methods', EKB Journal Management System, 66(2), pp. 93-100. doi: 10.21608/ejchem.2022.131308.5789
AL-Sayd Toohi, H., Al-Hyali, D. Development of new methods for calculation of ionization constants of a number of Schiff base compounds using quantum mechanics methods. EKB Journal Management System, 2023; 66(2): 93-100. doi: 10.21608/ejchem.2022.131308.5789

Development of new methods for calculation of ionization constants of a number of Schiff base compounds using quantum mechanics methods

Egyptian Journal of Chemistry
Volume 66, Issue 2, February 2023, Page 93-100  XML PDF (468.29 K)
Document Type: Original Article
DOI: 10.21608/ejchem.2022.131308.5789
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Authors
Homam AL-Sayd Toohi email ; Dalal Al-Hyali
Directorate of Education in Nineveh, Iraq
Abstract
Two of the quantum mechanical methods, semi-empirical calculation represented by the AM1 model and an Abinitio method DFT, were used to accomplish a theoretical study to estimate the ionization constant (pKa) for several benzaldoximes substitution(BS). During the discussion of the theoretical variables selected for achieving thy study by the two ways mentioned above, the results showed that the methods of basic calculations (Abinitio) were more suitable than the semi-empirical method for such calculation, and the relationship between the observed and calculated parameters was determined together with their experimental values.

The relationship between the theoretically calculated (pKa) and their experimental values have been determined. These theoretically calculated variables were correlated using the two methods (DFT, AM1)with the values of pKa calculated experimentally by using multi parameters and linear regression analysis by trial and error. The results obtained by correlation were well indicated by the values of the correlation coefficient (R2) and standard deviation (SE) values in each method and the large agreement between the practical pKa values with the theoretical computed values. The great convergence between the theoretical pKa values and the practical values for both methods(AM1, DFT) indicates the suitability and accuracy for such calculation applied in this paper.
Keywords
Ionization constant; benzaldoximes substitution; quantum mechanics methods; AM1; DFT
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