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Document Type : Research Paper


Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran.


The hydrogen bonding interaction plays an important role in determining the shape, the structure, and stability, physical properties, and functions of molecules.
In the current research, two intermolecular interactions, i.e., (1) hydrogen bonds and (2) substituent effects, were analyzed and compared. For this purpose, the geometries of 2-pyridone and its substituted dimers (C5H4X N (O) X = F, Cl, and Br) were optimized by means of B3LYP/6-311 + +G (d, p) method. The dependence between the strength of hydrogen bonding and the H···Y distance is discussed for the hydrogen bonds N-H…O (X = N; Y = O) system. The N-H…O angle is another geometrical characteristic of hydrogen bonding. To further investigate of nature and strength of hydrogen bond interactions in these systems the structural and electronic parameters were analyzed by using the quantum theory of atoms in the molecule (QTAIM) and natural bond orbital (NBO) analyses. Natural bond orbital (NBO) analysis was performed to reveal the origin of the interaction.


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