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Manigandan S, Muthusamy A, Anand S, Nandhakumar R, Guna P. Azine Based Oligoesteric Chemosensors for Cu 2+ Ion Detection: Synthesis, Structural Characterization, and Theoretical Investigations. J Fluoresc 2024:10.1007/s10895-024-03750-5. [PMID: 38809471 DOI: 10.1007/s10895-024-03750-5] [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: 02/10/2024] [Accepted: 04/29/2024] [Indexed: 05/30/2024]
Abstract
Synthesized monomer and its three oligoesters were characterized by techniques such as 1H, 13C{1H}, IR, UV, GPC and applied to chemosensor applications. A series of metal ions was studied with fluorophores to evaluate the sensitivity towards Cu2+ ion. The fluorophores results exhibit the selective and sensitive "Turn off" fluorescence response with Cu2+ ion in DMF/H2O (1:1, pH: 7.4, fluorophore: 5 µM) solution. Binding stoichiometry and binding constant of fluorophores were calculated using Stern-Volmer equation and Benesi-Hildebrand plots, respectively. Structure of fluorophores were studied using DFT, B3LYP/6-311 + + G(d,p) level basis set. Quenching mechanisms and electrical properties of fluorophores were explained with theoretical outcomes. Iodine doped and undoped oligoesters electrical conductivity were studied in solid-state and the conductivity was gradually increased with increase the contact time of iodine with oligoesters. At different frequencies and temperatures, the dielectric measurement was calculated using the two-probe method. Among all oligoesters, DMDAP exhibited high electrical conductivity and DMDMP has a higher dielectric constant value than other oligoesters.
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Affiliation(s)
- Subramani Manigandan
- PG and Research Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore, 641 020, Tamil Nadu, India
- Department of Chemical Engineering, Chonnam National University, 77 Yongbongro, Buk-Gu, Gwangju, 61186, South Korea
| | - Athianna Muthusamy
- PG and Research Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore, 641 020, Tamil Nadu, India.
| | - Siddeswaran Anand
- Department of Chemistry, K.S.R. College of Engineering, KSR Kalvinagar, Tiruchengode, 637215, Tamil Nadu, India.
| | - Raju Nandhakumar
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences (Deemed-to-Be University), Karunya Nagar, Coimbatore, 641 114, Tamil Nadu, India.
| | - Prabakaran Guna
- Department of Applied Chemistry, Karunya Institute of Technology and Sciences (Deemed-to-Be University), Karunya Nagar, Coimbatore, 641 114, Tamil Nadu, India
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Frizon TEA, Salla CAM, Grillo F, Rodembusch FS, Câmara VS, Silva HC, Zapp E, Junca E, Galetto FZ, de Costa AM, Pedroso GJ, Chepluki AA, Saba S, Rafique J. ESIPT-based benzazole-pyromellitic diimide derivatives. A thermal, electrochemical, and photochemical investigation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 288:122050. [PMID: 36495682 DOI: 10.1016/j.saa.2022.122050] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 10/14/2022] [Accepted: 10/24/2022] [Indexed: 06/17/2023]
Abstract
This study describes the synthesis of new pyromellitic diimide (PMDI) derivatives obtained in good yields from the reaction between pyromellitic dianhydride and aminobenzazoles reactive to proton-transfer in the excited state (ESIPT). In this investigation, a non-ESIPT PMDI was also prepared for comparison. These compounds presented absorption maxima in the ultraviolet region attributed to the allowed 1π-π* electronic transitions. Redshifted absorptions were observed for the ESIPT compounds (3b-3c) due to their π-extended conjugation if compared to the non-ESIPT dye (3a). The compounds presented fluorescence emissions between 300 and 600 nm, dependent on the solvent polarity and their chemical structures. While compound 3a presents a single emission, a dual fluorescence could be observed for compounds 3b-3c. As expected for ESIPT compounds, the emission at higher energies could be related to the excited enol conformer (E*), and the emission with a large Stokes shift was attributed to the keto tautomer (K*). All compounds presented fluorescence emission in the solid state, whereas the ESIPT derivatives presented redshifted emissions with a large Stokes shift, as expected. Cyclic voltammetry was employed to investigate the electrochemical properties of these compounds. The HOMO and LUMO energy levels were estimated at -5.40 to -5.00 eV and -2.84 to -2.62 eV, and good thermal stability (Td > 150 °C) was observed. Quantum chemical calculationsusingTD-DFT and DFT were performed to investigate the electronic and photophysical features of the molecules.
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Affiliation(s)
- Tiago E A Frizon
- Department of Energy and Sustainability, Federal University of Santa Catarina, Araranguá, SC, Brazil.
| | - Cristian A M Salla
- Physics Department, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Felipe Grillo
- Department of Materials and Metallurgy, Federal Institute of Espírito Santo, Vitória, ES, Brazil
| | - Fabiano S Rodembusch
- Institute of Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Viktor S Câmara
- Institute of Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Henrique C Silva
- Institute of Chemistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Eduardo Zapp
- Department of Exact Sciences and Education, Federal University of Santa Catarina, Blumenau, SC, Brazil
| | - Eduardo Junca
- University of the Extreme South of Santa Catarina (UNESC), Criciúma, SC, Brazil
| | - Fábio Z Galetto
- Department of Chemistry, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Angélica M de Costa
- Department of Energy and Sustainability, Federal University of Santa Catarina, Araranguá, SC, Brazil
| | - Gabriela J Pedroso
- Department of Energy and Sustainability, Federal University of Santa Catarina, Araranguá, SC, Brazil
| | - Antonio A Chepluki
- Department of Energy and Sustainability, Federal University of Santa Catarina, Araranguá, SC, Brazil
| | - Sumbal Saba
- Instituto de Química, Universidade Federal de Goiás, Goiânia, GO, Brazil
| | - Jamal Rafique
- Instituto de Química, Universidade Federal de Goiás, Goiânia, GO, Brazil; Institute of Chemistry, Federal University of Mato Grosso do Sul, Campo Grande, MS, Brazil
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Molecular, Electronic, Nonlinear Optical and Spectroscopic Analysis of Heterocyclic 3-Substituted-4-(3-methyl-2-thienylmethyleneamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones: Experiment and DFT Calculations. HETEROCYCL COMMUN 2021. [DOI: 10.1515/hc-2020-0118] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
In the present study, 3-p-methoxybenzyl/m-chlorobenzyl/phenyl-4-(3-methyl-2-thienylmethyleneamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones were obtained from the reaction between 3-methylthiophene-2-carbaldehyde and three different 4-amino-(3-p-methoxybenzyl/m-chlorobenzyl/phenyl)-4,5-dihydro-1H-1,2,4-triazole-5-ones. In order to compare experimental and theoretical values, the geometric parameter, electronic, nonlinear optical properties, molecular electrostatic potentials and spectroscopic properties of 3-substituted-4-(3-methyl-2-thienylmethyleneamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones have been simulated. The electronic properties of the newly synthesized compounds were calculated using DFT/B3LYP and DFT/B3PW91 methods revealing parameters such as ionization potential, electron affinity, energy gap, electronegativity, molecular hardness, molecular softness, electrophilic index, nucleophilic index and chemical potential, all obtained from HOMO and LUMO energies, dipole moments and total energies. UV-visible absorption spectra and the stimulation contributions in UV-visible transitions were obtained by using TD-DFT/B3LYP/6-311G(d,p) and TD-DFT/B3PW91/6-311G(d,p) methods in ethanol. The calculated absorption wavelengths, oscillator power and excitation energies were compared with experimental values. In line with DFT, the numbers of molecular vibration were analyzed through the basis set of 6-311G(d,p). The recording of FT-IR frequencies was done for the pertinent compound. The recorded frequencies through DFT/B3LYP and DFT/B3PW91 methods were compared to experimental values, with a result gained closest to the values of B3LYP. Finally, the Gaussian09W program package in DMSO phase, starting from the optimized structure, has been instrumental in calculating the 13C-NMR and 1H-NMR chemical shift values of the GIAO method.
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Sengottuvelu D, Athianna M, Siddeswaran A. High temperature stable conjugated polyazomethines containing naphthalene moiety: Synthesis, characterization, optical, electrical and thermal properties. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 246:118989. [PMID: 33035889 DOI: 10.1016/j.saa.2020.118989] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 09/11/2020] [Accepted: 09/21/2020] [Indexed: 06/11/2023]
Abstract
A series of azomethine diol monomers containing naphthalene moiety were synthesized and oxidatively polymerized in aqueous alkaline medium using NaOCl as oxidant. The structure of the monomers and polymers was characterized by using various spectroscopic techniques. PL spectra of polymers are exhibiting good emission with high Stokes shift values than the monomers due to their polyconjugated structure. The electrical conductivity of polymers was measured by a two-point probe technique, and it increases with an increase in iodine vapour contact time up to 144 h. The electrical conductivity values were correlated with the charge density on azomethine nitrogen obtained from the Hückel calculation method. The dielectric properties of polymers were studied at different temperatures in the frequency range from 50 Hz to 5 MHz. The synthesized polyazomethines have recorded high thermal stability and are shown by carbon residue of around 50% at 800 °C in the thermogravimetric analysis.
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Affiliation(s)
- Dineshkumar Sengottuvelu
- Department of Chemistry, Birla Institute of Technology and Science, Pilani Campus, Pilani, Rajasthan 333031, India
| | - Muthusamy Athianna
- PG and Research Department of Chemistry, Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore 641020, Tamil Nadu, India.
| | - Anand Siddeswaran
- Department of Chemistry, Muthayammal Engineering College (Autonomous), Rasipuram, Namakkal 637408, Tamil Nadu, India
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