Synthesis, and spectroscopic studies of charge transfer complex of 1,2-dimethylimidazole as an electron donor with π-acceptor 2,4-dinitro-1-naphthol in different polar solvents

Miyan, Lal; Khan, Ishaat M.; Ahmad, Afaq

doi:10.1016/j.saa.2015.02.060

Cited by 29 publications

(12 citation statements)

References 29 publications

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“…[1][2][3] This reaction arises from a weak interaction between donors and acceptors. [4][5][6][7][8] Moreover, CT complexes have been used as organic semiconductors 9 and organic solar cells 10 because of their electrical properties. 11,12 It has reported that the solid CT complex is stabilized by two noncovalent interactions, namely, hydrogen bond and dipole-dipole interactions.…”

Section: Introductionmentioning

confidence: 99%

<p>Charge Transfer Complex of Neostigmine with 2,3-Dichloro-5,6-Dicyano-1,4-Benzoquinone: Synthesis, Spectroscopic Characterization, Antimicrobial Activity, and Theoretical Study</p>

Yousef¹,

Ezzeldin²,

Abdel‐Aziz³

et al. 2020

DDDT

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Background: Electron donor-acceptor interactions are important molecular reactions for the activity of pharmacological compounds. The aim of the study is to develop a charge transfer (CT) complex: synthesis, characterization, antimicrobial activity, and theoretical study. Method and Results: A solid CT complex of neostigmine (NSG) with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) was synthesized and characterized by infrared spectra, NMR, and UV-visible spectroscopy. The results confirm the formation of a CT complex. The stability of the CT complex between NSG and DDQ in acetonitrile was determined in solution via spectrophotometric measurement, ie, by calculating the formation constant, molar extinction coefficient, and different spectroscopic parameters. The stoichiometry of the formed NSG-DDQ complex was determined using Job's method. The absorption band of the NSG-DDQ complex can be used for the quantification of NSG. Conclusion: The DFT geometry optimization of NSG, DDQ, and the CT complex and the UV comparative study of both theoretical and experimental structures are presented. The experimental results confirm the charge transfer structure. The bacterial study shows that the NSG-DDQ complex has good antibacterial activity against both Gram-positive and Gramnegative bacteria as well as antifungal activity against Candida albicans.

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Section: Introductionmentioning

confidence: 99%

<p>Charge Transfer Complex of Neostigmine with 2,3-Dichloro-5,6-Dicyano-1,4-Benzoquinone: Synthesis, Spectroscopic Characterization, Antimicrobial Activity, and Theoretical Study</p>

Yousef¹,

Ezzeldin²,

Abdel‐Aziz³

et al. 2020

DDDT

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“…Generally, complexes with formation constants less than unity are classified as weak, whereas K AD >1 for strong and stable complexes. The formation of the CTC depends upon the polarity of the solvent, that is, the dielectric constant, which is a measure of the ability of a molecule to insulate charge from another …”

Section: Resultsmentioning

confidence: 99%

“…The dominating tendency toward complexation is due to the CTC of MA and PADPA, which takes part in the reaction process as independent molecules; proton transfer also occurs from PADPA to MA . An equilibrium would therefore exist [Eq.…”

Section: Resultsmentioning

confidence: 99%

“…Thef ormation of the CTC depends upon the polarity of the solvent, that is, the dielectric constant, which is am easureo ft he ability of am olecule to insulate chargefrom another. [26] The thermodynamic functions, standard free-energy change DG o [kcal mol À1 ]o fc omplexation can be obtained from the well-known Equation (5):…”

Section: Uv/vis Studies Of the Ma-padpacomplexmentioning

confidence: 99%

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Charge‐Transfer Complex of p‐Aminodiphenylamine with Maleic Anhydride: Spectroscopic, Electrochemical, and Physical Properties

et al. 2016

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A new charge-transfer complex and the amide formed by the interaction between the electron donor of the p-aminodiphenylamine and the electron acceptor of maleic anhydride are investigated by spectroscopic methods. The amidation reaction is caused by proton and charge transfer between the maleic anhydride and p-aminodiphenylamine molecules. The Benesi-Hildebrand equation is used to determine the formation constant, the molar extinction coefficient and the standard Gibbs free energy of the complex by using UV/Vis spectroscopy. To reveal the electronic and spectroscopic properties of these molecules, theoretical computations are performed on the structures of maleic anhydride, p-aminodiphenylamine and the conformers of their charge-transfer complex. The charge-transfer complex and amidation reaction mechanism are also confirmed by IR and NMR spectroscopy and HRMS. The nature of the maleic anhydride-p-aminodiphenylamine complex is characterized by cyclic voltammetry, thermogravimetric analysis, XRD and SEM. Solid microribbons of this complex show higher thermal stability than p-aminodiphenylamine.

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“…1e3. The concentration of acceptor was varied over a wide range from 1 Â 10 À4 M to 3 Â 10 À4 M while the concentration of the donor was kept constant at 1 Â 10 À4 M in each solvent [43]. A 3 ml volume of donor, acceptor and the solution of 1:1 CT complex was scanned separately by using spectrophotometric titration [44] to obtain their maximum absorption at room temperature.…”

Section: Observation Of Ct Electronic Spectramentioning

confidence: 99%

Synthesis, crystallographic, spectral, and spectrophotometric studies of proton transfer complex of 1,2-dimethylimidazole with 3,5-dinitrobenzoic acid in different polar solvents

Miyan

Zulkarnain

Ahmad

2017

Journal of Molecular Structure

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Synthesis, and spectroscopic studies of charge transfer complex of 1,2-dimethylimidazole as an electron donor with π-acceptor 2,4-dinitro-1-naphthol in different polar solvents

Cited by 29 publications

References 29 publications

<p>Charge Transfer Complex of Neostigmine with 2,3-Dichloro-5,6-Dicyano-1,4-Benzoquinone: Synthesis, Spectroscopic Characterization, Antimicrobial Activity, and Theoretical Study</p>

<p>Charge Transfer Complex of Neostigmine with 2,3-Dichloro-5,6-Dicyano-1,4-Benzoquinone: Synthesis, Spectroscopic Characterization, Antimicrobial Activity, and Theoretical Study</p>

Charge‐Transfer Complex of p‐Aminodiphenylamine with Maleic Anhydride: Spectroscopic, Electrochemical, and Physical Properties

Synthesis, crystallographic, spectral, and spectrophotometric studies of proton transfer complex of 1,2-dimethylimidazole with 3,5-dinitrobenzoic acid in different polar solvents

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