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Amudha G, Santhakumari R, Chandrika D, Mugeshini S, Rajeswari N, Sagadevan S. Growth, spectroscopic and Hirshfeld surface analysis on pyridine urea single crystal. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132606] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Structural transition of C6−nSinNH7 at n = 0–6 clusters upon substitution of carbon by silicon. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.06.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Rahmani R, Boukabcha N, Chouaih A, Hamzaoui F, Goumri-Said S. On the molecular structure, vibrational spectra, HOMO-LUMO, molecular electrostatic potential, UV–Vis, first order hyperpolarizability, and thermodynamic investigations of 3-(4-chlorophenyl)-1-(1yridine-3-yl) prop-2-en-1-one by quantum chemistry calculations. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.11.033] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kavimani M, Balachandran V, Narayana B, Vanasundari K, Revathi B. Topological analysis (BCP) of vibrational spectroscopic studies, docking, RDG, DSSC, Fukui functions and chemical reactivity of 2-methylphenylacetic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 190:47-60. [PMID: 28898821 DOI: 10.1016/j.saa.2017.09.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Revised: 09/02/2017] [Accepted: 09/06/2017] [Indexed: 06/07/2023]
Abstract
Experimental FT-IR and FT-Raman spectra of 2-methylphenylacetic acid (MPA) were recorded and theoretical values are also analyzed. The non-linear optical (NLO) properties were evaluated by determination of first (5.5053×10-30 e.s.u.) and second hyper-polarizabilities (7.6833×10-36 e.s.u.) of the title compound. The Multiwfn package is used to find the weak non-covalent interaction (Van der Wall interaction) and strong repulsion (steric effect) of the molecule and examined by reduced density gradient. The molecular electrostatic potential (MEP) analysis used to find the most reactive sites for the electrophilic and nucleophilic attack. The chemical activity (electronegativity, hardness, chemical softness and chemical potential) of the title compound was predicted with the help of HOMO-LUMO energy values. The natural bond orbital (NBO) has been analyzed the stability of the molecule arising from the hyper-conjugative interaction. DSSCs were discussed in structural modifications that improve the electron injection efficiency of the title compound (MPA). The Fukui functions are calculated in order to get information associated with the local reactivity properties of the title compound. The binding sites of the two receptors were reported by molecular docking field and active site bond distance is same 1.9Å. The inhibitor of the title compound forms a stable complex with 1QYV and 2H1K proteins at the binding energies are -5.38 and -5.85 (∆G in kcal/mol).
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Affiliation(s)
- M Kavimani
- Centre for Research, Department of Physics, Arignar Anna Govt. Arts College, Musiri, Tiruchirappalli 621 211, India
| | - V Balachandran
- Centre for Research, Department of Physics, Arignar Anna Govt. Arts College, Musiri, Tiruchirappalli 621 211, India.
| | - B Narayana
- Department of Studies in Chemistry, Mangalore University, Mangalagangotri, 574 199, India
| | - K Vanasundari
- Centre for Research, Department of Physics, Arignar Anna Govt. Arts College, Musiri, Tiruchirappalli 621 211, India
| | - B Revathi
- Centre for Research, Department of Physics, Arignar Anna Govt. Arts College, Musiri, Tiruchirappalli 621 211, India
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Chidan Kumar C, Balachandran V, Fun HK, Chandraju S, Quah CK. Synthesis, crystal growth, single crystal X-ray analysis and vibrational spectral studies of (2E)-3-(2-chloro-4-fluorophenyl)-1-(3,4-dimethoxyphenyl)prop-2-en-1-one: A combined DFT study. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.07.041] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Hernández-Paredes J, Hernández-Negrete O, Carrillo-Torres RC, Sánchez-Zeferino R, Duarte-Moller A, Alvarez-Ramos ME. Experimental and theoretical investigation on the molecular structure, spectroscopic and electric properties of 2,4-dinitrodiphenylamine, 2-nitro-4-(trifluoromethyl)aniline and 4-bromo-2-nitroaniline. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 149:240-253. [PMID: 25965171 DOI: 10.1016/j.saa.2015.04.080] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 04/23/2015] [Accepted: 04/25/2015] [Indexed: 06/04/2023]
Abstract
2,4-Dinitrodiphenylamine (I), 2-nitro-4-(trifluoromethyl)aniline (II) and 4-bromo-2-nitroaniline (III) have been investigated by DFT and experimental FTIR, Raman and UV-Vis spectroscopies. The gas-phase molecular geometries were consistent with similar compounds already reported in the literature. From the vibrational analysis, the main functional groups were identified and their absorption bands were assigned. Some differences were found between the calculated and the experimental UV-Vis spectra. These differences were analyzed and explained in terms of the TD-DFT/B3LYP limitations, which were mainly attributed to charge-transfer (CT) effects. These findings were in agreement with previous works, which reported that TD-DFT/B3LYP calculations diverge from experimental results when the electronic transitions involve CT. Despite this, TD-DFT/B3LYP calculations provided satisfactory results and a detailed description of the electronic transitions involved in the absorption bands of the UV-Vis spectra. In terms of the NLO properties, it was found that compound (I) is a good candidate for NLO applications and deserves further study due to its good β values. However, the β values for compounds (II) and (III) were negatively affected compared to those found on o-nitroaniline.
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Affiliation(s)
- Javier Hernández-Paredes
- Departamento de Física, Universidad de Sonora (UNISON), Edificio 3R (Planta Alta) Blvd. Luis Encinas J y Rosales S/N Col. Centro, Hermosillo, Sonora C.P. 83000, Mexico.
| | - Ofelia Hernández-Negrete
- Departamento de Física, Universidad de Sonora (UNISON), Edificio 3R (Planta Alta) Blvd. Luis Encinas J y Rosales S/N Col. Centro, Hermosillo, Sonora C.P. 83000, Mexico
| | - Roberto C Carrillo-Torres
- Departamento de Física, Universidad de Sonora (UNISON), Edificio 3R (Planta Alta) Blvd. Luis Encinas J y Rosales S/N Col. Centro, Hermosillo, Sonora C.P. 83000, Mexico
| | - Raúl Sánchez-Zeferino
- Departamento de Física, Universidad de Sonora (UNISON), Edificio 3R (Planta Alta) Blvd. Luis Encinas J y Rosales S/N Col. Centro, Hermosillo, Sonora C.P. 83000, Mexico
| | - Alberto Duarte-Moller
- Centro de Investigación en Materiales Avanzados S. C. (CIMAV), Miguel de Cervantes 120, Chihuahua, Chihuahua C.P. 31109, Mexico
| | - Mario E Alvarez-Ramos
- Departamento de Física, Universidad de Sonora (UNISON), Edificio 3R (Planta Alta) Blvd. Luis Encinas J y Rosales S/N Col. Centro, Hermosillo, Sonora C.P. 83000, Mexico
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Saravanan S, Balachandran V. Conformational stability, spectroscopic (FT-IR, FT-Raman and UV-Vis) analysis, NLO, NBO, FMO and Fukui function analysis of 4-hexylacetophenone by density functional theory. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 138:406-423. [PMID: 25528503 DOI: 10.1016/j.saa.2014.11.091] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2014] [Accepted: 11/24/2014] [Indexed: 06/04/2023]
Abstract
The experimental and theoretical study on the structures and vibrations of 4-hexylacetophenone (abbreviated as 4HAP) are presented. The FT-IR and FT-Raman spectra of the title compound have been recorded in the region 4000-400cm(-1) and 3500-100cm(-1) respectively. The molecular structures, vibrational wavenumbers, infrared intensities and Raman activities were calculated using DFT (B3LYP and LSDA) method with 6-311++G(d,p) basis set. The most stable conformer of 4HAP is identified from the computational results. The assignments of the vibrational spectra have been carried out with the aid of normal coordinate analysis (NCA) following the scaled quantum mechanical force field methodology (SQMEF). The linear polarizability (α) and the first hyperpolarizability (βtot) values of the investigated molecule have been computed using B3LYP and LSDA with 6-311++G(d,p) basis set. Stability of the molecule arising from hyper conjugative interaction and charge transfer delocalization has been analyzed using natural bond orbital (NBO) analysis. The molecule orbital contributions are studied by density of energy states (DOSs). UV-Vis spectrum and effects of solvents have been discussed effects of solvents have been discussed and the electronic properties such as HOMO and LUMO energies were determined by time-dependent TD-DFT approach. Fukui function and Mulliken analysis on atomic charges of the title compound have been calculated. Finally, electrophilic and nucleophilic descriptors of the title molecule have been calculated.
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Affiliation(s)
- S Saravanan
- Department of Physics, Karpagam University, Coimbatore 641 021, India; Department of Physics, J.J. College of Arts and Science (Autonomous), Pudukkottai 622 422, India
| | - V Balachandran
- Centre for Research, Department of Physics, AA Government Arts College, Musiri, Tiruchirappalli 621 211, India.
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Saravanan S, Balachandran V. Quantum mechanical study and spectroscopic (FT-IR, FT-Raman, UV-Visible) study, potential energy surface scan, Fukui function analysis and HOMO-LUMO analysis of 3-tert-butyl-4-methoxyphenol by DFT methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 130:604-620. [PMID: 24813291 DOI: 10.1016/j.saa.2014.04.058] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Revised: 03/30/2014] [Accepted: 04/07/2014] [Indexed: 06/03/2023]
Abstract
This study represents an integral approach towards understanding the electronic and structural aspects of 3-tert-butyl-4-methoxyphenol (TBMP). Fourier-transform Infrared (FT-IR) and Fourier-transform Raman (FT-Raman) spectra of TBMP was recorded in the region 4000-400 cm(-1) and 3500-100 cm(-1), respectively. The molecular structures, vibrational wavenumbers, infrared intensities and Raman activities were calculated using DFT (B3LYP and LSDA) methods using 6-311++G (d,p) basis set. The most stable conformer of TBMP was identified from the computational results. The assignments of vibrational spectra have been carried out with the help of normal co-ordinate analysis (NCA) following the scaled quantum mechanical force field (SQMFF) methodology. The first order hyperpolarizability (β0) and related properties (β, α0 and Δα) of TBMP have been discussed. The stability and charge delocalization of the molecule was studied by Natural Bond Orbital (NBO) analysis. UV-Visible spectrum and effects of solvents have been discussed and the electronic properties such as HOMO and LUMO energies were determined by time-dependent TD-DFT approach with B3LYP/6-311++G (d,p) level of theory. The molecule orbital contributions are studied by density of energy states (DOSs). The reactivity sites are identified by mapping the electron density into electrostatic potential surface (MEP). Mulliken analysis of atomic charges is also calculated. The thermodynamic properties at different temperatures were calculated, revealing the correlations between standard heat capacities, standard entropy and standard enthalpy changes with temperatures. Global hardness, global softness, global electrophilicity and ionization potential of the title compound are determined.
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Affiliation(s)
- S Saravanan
- Department of Physics, Karpagam University, Coimbatore 641 021, India; Department of Physics, J.J. College of Arts and Science (Autonomous), Pudukkottai 622 422, India
| | - V Balachandran
- Centre for Research, Department of Physics, AA Government Arts College, Musiri, Tiruchirappalli 621 211, India.
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