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Chemek M, Rhouma FIH, Chemek M, Safi Z, Kadi A, Naili S, Wazzan N, Kamel A. Impact of the chemical insertion of the dimethylamino group on the electronic and optical properties of the 4-(methoxyphenyl acetonitrile) monomer (MPA): a DFT theoretical investigation. J Mol Model 2024; 30:271. [PMID: 39017741 DOI: 10.1007/s00894-024-06062-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Accepted: 07/03/2024] [Indexed: 07/18/2024]
Abstract
CONTEXT Density functional theory (DFT) calculations on the ground and the first excited state are performed on the modified and unmodified 4-(methoxyphenyl acetonitrile) monomer (referred to as MPA). The modified monomer named MFA is obtained by Knoevenagel condensation of MPA with dimethylformamide dimethyl acetal (DMF-DMA). DFT computations show that the chemical grafting of the dimethylamino group onto the MPA unit induces a great change in the geometric, electronic, and optical properties. Going from MPA to MFA monomer, a great change in the frontier orbitals of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) in the ground and the first excited state is observed. Consequently, a reduction in the energy gap HOMO-LUMO and an enhancement in the absorption and emission properties are observed under the chemical modification. The observed modifications in the electronics and optical properties are the result of the charge transfer appearing between the cyano (C≡N) acceptor group and the dimethylamino (DMF-DMA)-grafted group donor ring. METHODS Quantum chemical calculations were performed in the ground and the first excited state using the density functional theory (DFT), and it extends the time-dependent density functional theory (TD-DFT), implemented in the Gaussian 09 software package. The ground state is obtained by optimization of the studied molecular geometries by employing the DFT/M062X/6-31G(d,p) level of theory. The first excited state is obtained by re-optimization of the ground state geometries using the TD-DFT/M062X/6-31G(d,p) level of theory. The contour plots of the frontier orbitals and the molecular electrostatic potential (MEP) maps are obtained from the ground and the first excited state, optimized geometries, and drawn using Gaussview software.
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Affiliation(s)
- Mourad Chemek
- Laboratoire de Recherche: Synthèse asymétrique et ingénierie moléculaire de matériaux organiques pour l'électronique organique (LR18ES19), Faculté des Sciences de Monastir, 5000, Monastir, Tunisia.
- Institut Supérieur des Sciences Appliquées et de Technologie de Sousse (ISSAT-Sousse), Université de Sousse-Tunisie, Sousse, Tunisia.
| | - F I H Rhouma
- Laboratory of Nanomaterials and Renewable Energy Systems, Research and Technology Center of Energy, Borj-Cedria Science and Technology Park, BP 95, 2050, Hammam-Lif, Tunisia
| | - Marouane Chemek
- Department of Food and Biotechnology, South Ural State University, Chelyabinsk, 454080, Russia
| | - Zaki Safi
- Chemistry Department, Faculty of Science, Al Azhar University-Gaza, P.O Box 1277, Gaza, Palestine
| | - Ammar Kadi
- Department of Food and Biotechnology, South Ural State University, Chelyabinsk, 454080, Russia
| | - Salem Naili
- Department of Physics, College of Science, Qassim University, Buraydah, 51452, Saudi Arabia
| | - Nuha Wazzan
- Chemistry Department, Faculty of Science, King Abdulaziz University, P.O Box 42805, Jeddah, 21589, Saudi Arabia
| | - Alimi Kamel
- Laboratoire de Recherche: Synthèse asymétrique et ingénierie moléculaire de matériaux organiques pour l'électronique organique (LR18ES19), Faculté des Sciences de Monastir, 5000, Monastir, Tunisia
- Institut National de Recherche et d'Analyse Physico-chimique, Biotechpôle Sidi Thabet, Ariana, 2020, Tunisia
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