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Venil K, Lakshmi A, Balachandran V, Narayana B, Salian VV. FT-IR and FT-Raman investigation, quantum chemical analysis and molecular docking studies of 5-(4-Propan-2-yl)benzylidene)-2-[3-(4-chlorophenyl)-5[4-(propan-2-yl)phenyl-4,5-dihydro-1H-pyrazol-1-yl]-1,3-thiazol-4(5H)-one. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129070] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Viji A, Balachandran V, Babiyana S, Narayana B, Saliyan VV. Molecular docking and quantum chemical calculations of 4-methoxy-{2-[3-(4-chlorophenyl)-5-(4-(propane-2-yl) PHENYL)-4, 5-dihydro-1H-pyrazol-1-yl]- 1, 3-thiazol-4-yl}phenol. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127452] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Karthick T, Tandon P, Srivastava K, Singh S. Evaluation of non-covalent interactions of chlorambucil (monomer and dimer) and its interaction with biological targets: Vibrational frequency shift, electron density topological and automated docking analysis. ARAB J CHEM 2018. [DOI: 10.1016/j.arabjc.2017.10.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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Sangeetha K, Guru Prasad L, Mathammal R. Structural elucidation and physicochemical properties of an organic NLO crystal: 4-Nitrotoluene-2-sulphonic acid dihydrate. J Mol Struct 2018; 1155:598-609. [DOI: 10.1016/j.molstruc.2017.11.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Kavimani M, Balachandran V, Narayana B, Vanasundari K, Revathi B. Quantum chemical calculation (RDG) of molecular structural evaluation, Hirshfeld, DSSC and docking studies of 4-nitrophenylacetic acid. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.07.094] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Karthick T, Tandon P, Singh S. Evaluation of Structural Isomers, Molecular Interactions, Reactivity Descriptors, and Vibrational Analysis of Tretinoin. ANAL SCI 2017; 33:83-87. [PMID: 28070082 DOI: 10.2116/analsci.33.83] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Tretinoin is known to be a pharmaceutical drug for treating acne vulgaris, keratosis pilaris, and acute promyelocytic leukemia. In order to reveal the possible conformers of tretinoin, the energies of all the conformers through rotational bonds have been evaluated by systematic rotor search analysis. The intramolecular interactions ranging from strong hydrogen bonds to weak van der Waals forces present in tretinoin have been distinguished with the help of electron density mapping and wavefunction analysis. The global reactivity descriptors and Fukui functions of tretinoin have been calculated and discussed. The sites suitable for electrophilic attack and nucleophilic attack have been identified with the help of Hirshfeld partitioning. The vibrational spectroscopic signature of tretinoin and mixed mode band assignments have been elucidated with the help of experimental and simulated spectra.
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Affiliation(s)
- T Karthick
- Department of Physics, University of Lucknow
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Karthikeyan N, Joseph Prince J, Ramalingam S, Periandy S. Spectroscopic [FT-IR and FT-Raman] and theoretical [UV-Visible and NMR] analysis on α-Methylstyrene by DFT calculations. Spectrochim Acta A Mol Biomol Spectrosc 2015; 143:107-119. [PMID: 25721781 DOI: 10.1016/j.saa.2015.02.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 01/07/2015] [Accepted: 02/04/2015] [Indexed: 06/04/2023]
Abstract
In the present research work, the FT-IR, FT-Raman and (13)C and (1)H NMR spectra of the α-Methylstyrene were recorded. The observed fundamental frequencies in finger print as well as functional group regions were assigned according to their uniqueness region. The Gaussian computational calculations are carried out by HF and DFT (B3LYP and B3PW91) methods with 6-31++G(d,p) and 6-311++G(d,p) basis sets and the corresponding results were tabulated. The impact of the presence of vinyl group in phenyl structure of the compound is investigated. The modified vibrational pattern of the molecule associated vinyl group was analyzed. Moreover, (13)C NMR and (1)H NMR were calculated by using the gauge independent atomic orbital (GIAO) method with B3LYP methods and the 6-311++G(d,p) basis set and their spectra were simulated and the chemical shifts linked to TMS were compared. A study on the electronic and optical properties; absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies were carried out. The kubo gap of the present compound was calculated related to HOMO and LUMO energies which confirm the occurring of charge transformation between the base and ligand. Besides frontier molecular orbitals (FMO), molecular electrostatic potential (MEP) was performed. The NLO properties related to Polarizability and hyperpolarizability based on the finite-field approach were also discussed.
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Affiliation(s)
- N Karthikeyan
- Department of Physics, Indra Ganesan College of Engineering, Trichy, Tamil Nadu, India
| | - J Joseph Prince
- Department of Physics, Anna University, Bit Campus, Tiruchirappalli, Tamil Nadu, India
| | - S Ramalingam
- Department of Physics, A.V.C. College, Mayiladuthurai, Tamil Nadu, India.
| | - S Periandy
- Department of Physics, Tagore Arts College, Puducherry, India
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Saravanan S, Balachandran V, Vishwanathan K. Conformational stability, molecular orbital studies (chemical hardness and potential), vibrational investigation and theoretical NBO analysis of 4-tert-butyl-3-methoxy-2,6-dinitrotoluene. Spectrochim Acta A Mol Biomol Spectrosc 2014; 124:451-469. [PMID: 24508884 DOI: 10.1016/j.saa.2014.01.059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Revised: 12/10/2013] [Accepted: 01/10/2014] [Indexed: 06/03/2023]
Abstract
The FT-IR and FT-Raman spectra of 4-tert-butyl-3-methoxy-2,6-dinitrotoluene (musk ambrette) have been recorded in the regions 4000-400 cm(-1) and 3500-100 cm(-1), respectively. The total energy calculations of musk ambrette were tried for the possible conformers. The molecular structure, geometry optimization, vibrational frequencies were obtained by the density functional theory (DFT) using B3LYP and LSDA method with 6-311G(d,p) basis set for the most stable conformer "C1". The complete assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes, calculated and the scaled values were compared with experimental FT-IR and FT-Raman spectra. The observed and the calculated frequencies are found to be in good agreement. The stability of the molecule arising from hyper conjugate interactions and the charge delocalization has been analyzed using bond orbital (NBO) analysis. The HOMO and LUMO energy gap reveals that the energy gap reflects the chemical activity of the molecule. The dipole moment (μ), polarizability (α), anisotropy polarizability (Δα) and first hyperpolarizability (βtot) of the molecule have been reported. The thermodynamic functions (heat capacity, entropy and enthalpy) were obtained for the range of temperature 100-1000 K. Information about the size, shape, charge density distribution and site of chemical reactivity of the molecule has been obtained by mapping electron density isosurface with molecular electrostatic potential (MEP).
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Affiliation(s)
- S Saravanan
- Department of Physics, Karpagam University, Coimbatore 641021, India; Department of Physics, JJ College of Arts and Science (Autonomous), Pudukkottai 622422, India
| | - V Balachandran
- PG & Research Department of Physics, AA Government Arts College, Musiri, Tiruchirappalli 621211, India.
| | - K Vishwanathan
- Department of Physics, Karpagam University, Coimbatore 641021, India
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Cunha VRR, Izumi CMS, Petersen PAD, Magalhães A, Temperini MLA, Petrilli HM, Constantino VRL. Mefenamic Acid Anti-Inflammatory Drug: Probing Its Polymorphs by Vibrational (IR and Raman) and Solid-State NMR Spectroscopies. J Phys Chem B 2014; 118:4333-44. [DOI: 10.1021/jp500988k] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Vanessa R. R. Cunha
- Departamento
de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, CEP 05508-000, São Paulo-SP, Brazil
| | - Celly M. S. Izumi
- Departamento
de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, CEP 05508-000, São Paulo-SP, Brazil
| | - Philippe A. D. Petersen
- Departamento
de Física dos Materiais e Mecânica, Instituto de Física, Universidade de São Paulo, CEP 05315-970, São Paulo-SP, Brazil
| | - Alviclér Magalhães
- Departamento
de Química Inorgânica, Instituto de Química, Universidade Estadual de Campinas, CEP 13083-970, Campinas-SP, Brazil
| | - Marcia L. A. Temperini
- Departamento
de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, CEP 05508-000, São Paulo-SP, Brazil
| | - Helena M. Petrilli
- Departamento
de Física dos Materiais e Mecânica, Instituto de Física, Universidade de São Paulo, CEP 05315-970, São Paulo-SP, Brazil
| | - Vera R. L. Constantino
- Departamento
de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, CEP 05508-000, São Paulo-SP, Brazil
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Balachandran V, Mahalakshmi G, Lakshmi A, Janaki A. DFT, FT-Raman, FT-IR, HOMO-LUMO and NBO studies of 4-Methylmorpholine. Spectrochim Acta A Mol Biomol Spectrosc 2012; 97:1101-1110. [PMID: 22929905 DOI: 10.1016/j.saa.2012.07.112] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2012] [Revised: 07/22/2012] [Accepted: 07/26/2012] [Indexed: 06/01/2023]
Abstract
The experimental FT-IR (4000-400 cm(-1)) and FT-Raman (3500-100 cm(-1)) spectra of 4-Methylmorpholine were recorded. The observed bands were interpreted with the aid of normal coordinate analysis and force field calculations based on density functional theory (DFT) using B3LYP functional theory (DFT) using B3LYP functional with 6-311+G and 6-3++G basis sets. The complete assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes, calculated with scaled quantum mechanical (SQM) method. The molecular structure and vibrational frequencies, infrared intensities and Raman scattering actives have been calculated frequency showed the best agreement with experimental results. The formation of the hydrogen bond was investigated using NBO calculations. The calculated HOMO and LUMO energies show that charge transfer occur within the molecule. The dipolemoment (μ) and polarizability (α), anisotropy polarizability (Δα) and first hyperpolarizability (β(total)) of the molecule have been reported.
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Affiliation(s)
- V Balachandran
- Research Department of Physics, Arignar Anna Government Arts College, Musiri, Tiruchirapalli 621211, India.
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