Prediction of Thermodynamic and Structural Properties of Sulfamerazine and Sulfamethazine in Water Using DFT and ab Initio Methods

Neda Hazhir; Farhoush Kiani; Hasan Tahermansouri; Saraei Ghorbani-Hasan Azade; Fardad Koohyar

doi:10.29356/jmcs.v62i1.575

Prediction of Thermodynamic and Structural Properties of Sulfamerazine and Sulfamethazine in Water Using DFT and ab Initio Methods

Authors

Neda Hazhir Islamic Azad University
Farhoush Kiani Islamic Azad University
Hasan Tahermansouri Islamic Azad University
Saraei Ghorbani-Hasan Azade Islamic Azad University
Fardad Koohyar 1, 2. Ton Duc Thang University

DOI:

https://doi.org/10.29356/jmcs.v62i1.575

Keywords:

Acid-ionization constant, Sulfamethazine, Sulfamerazine, Density functional theory, Nano drug modeling

Abstract

The acid-ionization constant (pK_a) is an important physico-chemical property of molecules. In this research work, the ab initio and density functional theory (DFT) methods, in combination with the polarized continuum model (PCM), were used to calculate the acid-ionization constant of sulfamethazine (SMZ) and sulfamerazine (SMR) solved in water. For these molecules, the calculated pK_a value is in relatively good agreement with the experimental one. Also, in these calculations some structural properties such as dihedral angle between the indicated atoms: D, bond lengths between the indicated atoms: d, Bohr radius: a˳, intermolecular hydrogen bond: IHB, and total atomic charge: au have been determined. These data can be used in nano drug modeling of sulfamethazine and sulfamerazine.

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Author Biographies

Neda Hazhir, Islamic Azad University

Department of Chemistry, Faculty of science, Ayatollah Amoli Branch

Farhoush Kiani, Islamic Azad University

Department of Chemistry, Faculty of science, Ayatollah Amoli Branch

Hasan Tahermansouri, Islamic Azad University

Department of Chemistry, Faculty of science, Ayatollah Amoli Branch

Saraei Ghorbani-Hasan Azade, Islamic Azad University

Department of Agriculture of Food Science Engineering, Ayatollah Amoli Branc

Fardad Koohyar, 1, 2. Ton Duc Thang University

Division of Computational Physics, Institute for Computational Science
Faculty of Applied Sciences

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