DFT study and NBO analysis of solvation/substituent effects of 3-phenylbenzo[d]thiazole-2(3H)-imine derivatives

Marzieh Miar, Abolfazl Shiroudi, Khalil Pourshasian, Ahmed Reza Oliaey, Farhad Hatamjafari

Abstract


In this work, to determine natural bond orbital (NBO) analysis, solvation and substituent effects for electron-releasing substituents (CH3, OH) and electron-withdrawing derivatives (Cl, NO2, CF3) in para positions on the molecular structure of the synthesized 3-phenylbenzo[d] thiazole-2(3H)-imine derivatives 1-6 [H (1), CH3 (2), Cl (3), OH (4), CF3 (5), NO2 (6)] in the selected solvents (acetone, toluene, and ethanol) and gas-phase employing polarizable continuum method (PCM) model were studied at the M06-2x/6-311++G(d,p) level of theory. The relative stability of the studied compounds was affected by the possibility of intramolecular interactions between substituents and the electron donor/acceptor centers of the thiazole ring. Furthermore, atomic charges electron density, chemical thermodynamics, energetic properties, dipole moments, and the nucleus-independent chemical shifts (NICS) of the studied compounds and their relative stability are considered. The dipole moment values and the HOMO-LUMO energy gap reveal the different charge transfer possibilities within the considered molecules. Frontier molecular orbital (FMO) analysis revealed that compound 6 has very small HOMO-LUMO energy gaps in the considered phases, and is thus kinetically less stable. The obtained HOMO-LUMO energy gap corresponds to intramolecular hyperconjugative interactions p→p*. Finally, NBO analysis is carried out to demonstrate the charge transfer between localized bonds and lone pairs.


Keywords


thiazole; theoretical computations; DFT; PCM; NBO; solvent ef¬fects; dipole moment

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DOI: https://doi.org/10.2298/JSC200421058M

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