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Ramírez-García JC, Vázquez-Ramírez R, Patiño ME, Aguirre-Cabrera C, Carranza V, Álvarez CMG. Theoretical study of Gibbs free energy and NMR chemical shifts, of the effect of methyl substituents on the isomers of (E)-1-(α,Ꞵ-Dimethylbenzyliden)-2,2-diphenylhydrazine. AN ACAD BRAS CIENC 2023; 95:e20220766. [PMID: 37466538 DOI: 10.1590/0001-3765202320220766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Accepted: 02/27/2023] [Indexed: 07/20/2023] Open
Abstract
A theoretical analysis of free Gibbs Energy and NMR 1H 13C chemical shifts of the effect of introduce methyl groups on diphenyl rings, to produce different isomers of (E)-1-(α,Ꞵ-dimethylbenzylidene)-2,2-diphenylhydrazine, is presented. IR vibrational frequencies, Mulliken charges, molecular electrostatic potential (MEP), Gibbs free energy (G) and 1H- and 13C-NMR chemical shifts were obtained by theoretical calculations. In this analysis it was found that the position of the methyl group affects the values of the 1H- and 13C-NMR chemical shifts and the ∆G and ∆H thermodynamic properties of formation and reaction, these properties vary with the same trend, for the isomers studied. Gibbs free energy calculations show that the theoretical (E)-1-(3,4-Dimethylbenzylidene)-2,2-diphenylhydrazine isomer is the most stable, which explains the success of the experimental synthesis of this compound among the other isomers. For this molecule, the C of the HC=N group is the most nucleophilic and the H is the least acidic. The 1H-NMR chemical shifts of protons show a strong correlation with the C=N distance. It was also observed that methyl affects the ν(C=N) frequencies, the C=N distance increases when the inductive effect of the methyl groups is in the structure.
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Affiliation(s)
- Juan Carlos Ramírez-García
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Av. 14 Sur Col. San Manuel, Ciudad Universitaria, Puebla, C.P. 72592 México
| | - Ricardo Vázquez-Ramírez
- Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, D.F. 04510, México
| | - María Eugenia Patiño
- Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Av. 14 Sur Col. Jardines de San Manuel, Ciudad Universitaria, Puebla, P.O. Box 1067, C.P. 72001 México
| | - Carla Aguirre-Cabrera
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Av. 14 Sur Col. San Manuel, Ciudad Universitaria, Puebla, C.P. 72592 México
| | - Vladimir Carranza
- Centro de Química, Instituto de Ciencias, Benemérita Universidad Autónoma de Puebla, Av. 14 Sur Col. Jardines de San Manuel, Ciudad Universitaria, Puebla, P.O. Box 1067, C.P. 72001 México
| | - Carmen Mária González Álvarez
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, Av. 14 Sur Col. San Manuel, Ciudad Universitaria, Puebla, C.P. 72592 México
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Kanmazalp SD, Macit M, Dege N. Hirshfeld surface, crystal structure and spectroscopic characterization of (E)-4-(diethylamino)-2-((4-phenoxyphenylimino)methyl)phenol with DFT studies. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.11.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Combinatorial experimental and DFT theoretical evaluation of a nano novel thio-dicarboxaldehyde based Schiff base supported on a thin polymer film as a chemosensor for Pb2+ detection. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.04.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Parsaee Z, Mohammadi K. Synthesis, characterization, nano-sized binuclear nickel complexes, DFT calculations and antibacterial evaluation of new macrocyclic Schiff base compounds. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.02.026] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Akçay HT, Çoruh U, Bayrak R, Menteşe E, Vazquez Lopez EM. A spectroscopic study on new phthalonitrile derivative and its computational background: 4-[(4,5-Diphenyl-4H-1,2,4-triazol-3-yl)sulfanyl]benzene-phthalonitrile. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.08.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Parsaee Z, Mohammadi K, Ghahramaninezhad M, Hosseinzadeh B. A novel nano-sized binuclear nickel(ii) Schiff base complex as a precursor for NiO nanoparticles: synthesis, characterization, DFT study and antibacterial activity. NEW J CHEM 2016. [DOI: 10.1039/c6nj02642g] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We prepared a new nano-hexadentate Schiff base and its nickel(ii) complex using an ultrasonic method, which produced NiO with an average size of 53 nm.
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Affiliation(s)
- Zohreh Parsaee
- Chemistry Department
- Faculty of Sciences
- Persian Gulf University
- Bushehr 75169
- Iran
| | - Khosro Mohammadi
- Chemistry Department
- Faculty of Sciences
- Persian Gulf University
- Bushehr 75169
- Iran
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