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Ansari SM, Khanum G, Bhat MUS, Rizvi MA, Reshi NUD, Ganie MA, Javed S, Shah BA. Studies towards investigation of Naphthoquinone-based scaffold with crystal structure as lead for SARS-CoV-19 management. J Mol Struct 2023; 1283:135256. [PMID: 36910907 PMCID: PMC9975501 DOI: 10.1016/j.molstruc.2023.135256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 02/21/2023] [Accepted: 02/27/2023] [Indexed: 03/06/2023]
Abstract
In this work, 1-(4-bromophenyl)-2a,8a-dihydrocyclobuta[b]naphthalene-3,8‑dione (1-(4-BP)DHCBN-3,8-D) has been characterized by single crystal X-ray to get it's crystal structure with R(all data) - R1 = 0.0569, wR2 = 0.0824, 13C and 1HNMR, as well as UV-Vis and IR spectroscopy. Quantum chemical calculations via DFT were used to predict the compound structural, electronic, and vibrational properties. The molecular geometry of 1-(4-BP)DHCBN-3,8-Dwas optimized utilizing the B3LYP functional at the 6-311++G(d,p) level of theory. The Infrared spectrum has been recorded in the range of 4000-550 cm-1. The Potential Energy Distribution (PED) assignments of the vibrational modes were used to determine the geometrical dimensions, energies, and wavenumbers, and to assign basic vibrations. The UV-Vis spectra of the titled compound were recorded in the range of 200-800 nm in ACN and DMSO solvents. Additionally, the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy gap and electronic transitions were determined using TD-DFT calculations, which also simulate the UV-Vis absorption spectrum. Natural Bond Orbital (NBO) analysis can be used to investigate electronic interactions and transfer reactions between donor and acceptor molecules. Temperature-dependent thermodynamic properties were also calculated. To identify the interactions in the crystal structure, Hirshfeld Surface Analysis was also assessed. The Molecular Electrostatic Potential (MEP) and Fukui functions were used to determine the nucleophilic and electrophilic sites. Additionally, the biological activities of 1-(4-BP)DHCBN-3,8-D were done using molecular docking. These results demonstrate a significant therapeutic potential for 1-(4-BP)DHCBN-3,8-D in the management of Covid-19 disorders. Molecular Dynamics Simulation was used to look at the stability of biomolecules.
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Affiliation(s)
- Shaghaf Mobin Ansari
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Research Management, Business Development, and Information Sciences and Technology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India
| | - Ghazala Khanum
- S.O. S in Chemistry, Jiwaji University, Gwalior, M. P 474011, India
| | - Muneer-Ul-Shafi Bhat
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Research Management, Business Development, and Information Sciences and Technology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India
| | | | - Noor U Din Reshi
- Department of Chemistry, University of Kashmir, Srinagar 190006, India
| | - Majid Ahmad Ganie
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Research Management, Business Development, and Information Sciences and Technology Division, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India
| | - Saleem Javed
- Department of Chemistry, University of Allahabad, Prayagraj, U.P. 211002, India
- Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India
| | - Bhahwal Ali Shah
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Natural Product & Medicinal Chemistry, CSIR-Indian Institute of Integrative Medicine, Jammu 180001, India
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Crystal growth, Hirshfeld surface, Quantum chemical calculations, Optical, Photoluminescence and Thermal Analyses of Sodium D-isoascorbate Monohydrate Single Crystal. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.134637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Thamarai A, Vadamalar R, Kumaran S, Ramesh P, Muthu S, Aayisha S, Raja M, Narayana B, Irfan A. Investigations on spectroscopic, ADMET properties and drug-likeness, molecular docking, chemical properties of (2E)-3-(biphenyl-4-yl)-1-(2,4-dichlorophenyl)-prop-2-en-1-one by combined density-functional theory. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132973] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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4
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Xue C, Wilson LD. Preparation and characterization of salicylic acid grafted chitosan electrospun fibers. Carbohydr Polym 2022; 275:118751. [PMID: 34742447 DOI: 10.1016/j.carbpol.2021.118751] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Revised: 09/15/2021] [Accepted: 10/10/2021] [Indexed: 02/05/2023]
Abstract
Chitosan (chi) and its modified forms as electrospun nanofibers have potential applications in advanced water treatment and biomedicine. Polyethylene oxide (PEO) is an additive commonly used to facilitate the formation of chitosan electrospun fibers because PEO (Mw ≥ 400 kDa) affords chain entanglement that stabilize the electrospinning jet, leading to enhanced formation of chi-based electrospun fibers. Herein, we report on the preparation of chitosan grafted with salicylic acid and its utility to afford improved electrospun fibers with low molecular weight (LMw) PEO (Mw » 100 kDa). A comparison of the interactions between original and grafted chitosan with PEO reveals that stable supramolecular assemblies are established between grafted chitosan and PEO, which provides support that such supramolecular interactions favor formation of chitosan electrospun fibers. Moreover, a porous chitosan electrospun nanofiber was prepared through physical treatment that reveals notably higher (ca. 4-fold) dye uptake than the pristine (unmodified) chitosan electrospun nanofibers.
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Affiliation(s)
- Chen Xue
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
| | - Lee D Wilson
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada.
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Saral A, Sudha P, Muthu S, Sevvanthi S, Irfan A. Molecular structure spectroscopic Elucidation, IEFPCM solvation (UV–Vis, MEP, FMO, NBO, NLO), molecular docking and biological assessment studies of lepidine (4-Methylquinoline). J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118249] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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Hamd Hssain A, Gündüz B, Majid A, Bulut N. NTCDA compounds of optoelectronic interest: Theoretical insights and experimental investigation. Chem Phys Lett 2021. [DOI: 10.1016/j.cplett.2021.138918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Beatrice ML, Delphine SM, Amalanathan M, Mary MSM, Robert HM, Mol KT. Molecular structure, spectroscopic, Fukui function, RDG, anti-microbial and molecular docking analysis of higher concentration star anise content compound methyl 4-methoxybenzoate-DFT study. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Bulk crystal growth, spectroscopic, hirshfeld surface analysis, physicochemical and quantum chemical investigations on 2-ethylimidazolium d-tartrate single crystal. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130448] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Arulaabaranam K, Muthu S, Mani G, Ben Geoffrey A. Speculative assessment, molecular composition, PDOS, topology exploration (ELF, LOL, RDG), ligand-protein interactions, on 5-bromo-3-nitropyridine-2-carbonitrile. Heliyon 2021; 7:e07061. [PMID: 34095571 PMCID: PMC8165421 DOI: 10.1016/j.heliyon.2021.e07061] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 03/18/2021] [Accepted: 05/11/2021] [Indexed: 01/29/2023] Open
Abstract
Computational calculations of 5-bromo-3-nitropyridine-2-carbonitrile (5B3N2C) on molecular structure and on energy are implemented using the 6-311++G(d,p) basis set by DFT/B3LYP method. The UV-Vis spectrum of 5B3N2C was obtained by TD-DFT with chloroform as a solvent. The analysis of molecular electrostatic potential (MEP) and frontier molecular orbital (FMO) were used to evaluate, the entire electron density and organic reactive sites of 5B3N2C. The electron-hole conversions were conjointly deliberated. Donor-acceptor interactions (NBO) analysis examines the intra-and intermolecular charge transfer, hyper conjugate interaction of the compound. The orbital molecular contributions are evaluated by density of states (DOS and PDOS). To discern the reactivity of the molecule, topology analyses were done. The biological prominence of the 5B3N2C molecule was investigated in a pertinent study of molecular docking with target protein 3CEJ exhibiting the centromere associated protein inhibitor property. Molecular Dynamics simulations were done to assess the stability of the complex. 5B3N2C physiochemical parameters were also compared to those of widely viable medications Ispinesib and Lonafarnib.
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Affiliation(s)
- K. Arulaabaranam
- Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, 604407, Tamilnadu, India
- Thiruvalluvar University, Serkadu, Tamilnadu, India
| | - S. Muthu
- Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, 604407, Tamilnadu, India
- Department of Physics, Puratchi Thalaivar Dr.M.G.R. Govt. Arts and Science College, Uthiramerur, 603406, India
| | - G. Mani
- Department of Physics, Arignar Anna Govt. Arts College, Cheyyar, 604407, Tamilnadu, India
| | - A.S. Ben Geoffrey
- Department of Physics, Madras Christian College, East Tambaram, 600059, Tamilnadu, India
- University of Madras, Chepauk, Chennai, 005, Tamilnadu, India
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Spectroscopic (FT-IR, FT-RAMAN, NMR, UV–Vis) investigations, computational analysis and molecular docking study of 5-bromo-2-hydroxy pyrimidine. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128494] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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Manjusha P, Prasana JC, Muthu S, Rizwana BF. Spectroscopic elucidation (FT-IR, FT-Raman and UV-visible) with NBO, NLO, ELF, LOL, drug likeness and molecular docking analysis on 1-(2-ethylsulfonylethyl)-2-methyl-5-nitro-imidazole: An antiprotozoal agent. Comput Biol Chem 2020; 88:107330. [PMID: 32711354 DOI: 10.1016/j.compbiolchem.2020.107330] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2020] [Revised: 07/03/2020] [Accepted: 07/08/2020] [Indexed: 11/26/2022]
Abstract
1-(2-ethylsulfonylethyl)-2-methyl-5-nitro-imidazole (1EMI) C8H13N3O4S also known as Tinidazole, selected for its antiprotozoal property is extensively used for spectroscopic elucidations and computational aspects using density functional methods. Along with spectral conclusions, further investigations on fundamental reactive properties such as electrical, optical, nonlinear combined with DFT simulations were performed. Molecular docking procedure supports the results of chosen appropriate antiprotozoal agent based on ligand-protein interactions. Experimental and simulated (B3LYP/6-311++G (d,p)) IR and Raman spectra showed concurrence. NLO analysis through first order hyperpolarizability parameter helps in finding the potential of 1EMI as a good NLO candidate. Charge delocalization and the stability of the compound were discussed using natural bond orbital (NBO) analysis. Furthermore, Electron localization function (ELF), local orbital locator (LOL), and Frontier molecular orbitals (FMO) were studied. Besides, Mulliken population analysis on atomic charges, Energy gap, chemical potential, global hardness, softness, ionization potential, electronegativity, electrophilicity index along thermodynamic parameters (enthalpy, entropy and heat capacity) have been calculated. Drug likeness parameters and molecular docking approach enabled to check pharmaceutical potential and biological activity of 1EMI. The biological activity of 1EMI through ligand and protein interactions have been confirmed theoretically for the treatment of Malaria, Invasive aspergillosis and Mycobacterium tuberculosis with respect to chosen proteins. Three different activity targets and protein interactions are quite successful revealing the bond distances, intermolecular energy, binding energy and inhibition constant. 2D interaction profile image of the two maximum interacted proteins and also Ramachandran plot used to show stereochemistry of selected protein. The activities of 1EMI were studied in accordance with literature survey and the results were presented.
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Affiliation(s)
- P Manjusha
- Department of Physics, S.D.N.B Vaishnav College for Women, Chromepet, Chennai, 600 044, Tamilnadu, India; Department of Physics, Madras Christian College, Chennai, 600 059, Tamilnadu, India; University of Madras, Chepauk, Chennai, 600 005, Tamilnadu, India
| | | | - S Muthu
- Department of Physics, Arignar Anna Government Arts College, Cheyyar, 604 407, Tamilnadu, India; Department of Physics, Puratchi Thalaivar Dr.M.G.R Govt. Arts and Science College, Uthiramerur, 603406, Tamilnadu, India.
| | - B Fathima Rizwana
- Department of Physics, Madras Christian College, Chennai, 600 059, Tamilnadu, India
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Manjusha P, prasana JC, Muthu S, Raajaraman BR. Density functional studies and spectroscopic analysis (FT-IR, FT-Raman, UV–visible, and NMR)with molecular docking approach on an antifibrotic drug Pirfenidone. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127394] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Crystal growth, structural, optical, vibrational analysis, Hirshfeld surface and quantum chemical calculations of 1, 3, 5-triphenylbenzene single crystal. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.06.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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14
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Invivo, molecular docking, spectroscopy studies of (S)-2,3-Dihydro-5,7-dihydroxy-2(3-hydroxy-4-methoxyphenyl)-4H-1-benzopyran-4-one: A potential uptake PI3/AKT inhibitor. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2019. [DOI: 10.1016/j.bcab.2019.101086] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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15
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Chinnasami S, Manikandan M, Chandran S, Paulraj R, Ramasamy P. Growth, Hirshfeld surfaces, spectral, quantum chemical calculations, photoconductivity and chemical etching analyses of nonlinear optical p-toluidine p-toluenesulfonate single crystal. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 206:340-349. [PMID: 30145495 DOI: 10.1016/j.saa.2018.08.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 08/08/2018] [Accepted: 08/10/2018] [Indexed: 06/08/2023]
Abstract
A single crystal of p-toluidine p-toluenesulfonate (PTPT) has been grown by slow evaporation solution technique (SEST) at room temperature. Single crystal X-ray analysis confirms that grown crystal belongs to the monoclinic structure with space group P21. Intermolecular interactions and fingerprint plots of PTPT molecules are executed by Hirshfeld surface analysis. It was found that H···H (44.2%) contacts have maximum intermolecular interactions contributions in the total Hirshfeld surface area. The characteristic absorption band occurs at below 290 nm. The functional groups were identified using FTIR and FT-Raman analyses and compared with theoretical values. The title molecule contains fourteen CH bonds and three OH bonds. The calculated HOMO and LUMO energy values are -6.125 eV and -1.157 eV, respectively. The chemical potential (μ) and electronegativity (χ) values are estimated to be -3.4938 eV and 3.4938 eV, respectively. The strongest negative hyperconjugation occurs due to the charge transfer from the occupied orbital (σ) to the unoccupied orbital (π*) which is calculated for the σ(N20-C21) → π*(N20-O18). The green and red lines in the total density of states (TDOS) spectrum indicate the occupied orbital and virtual orbital levels, respectively. Photoconductivity studies have been done for the grown crystal. It is observed that the dark current is greater than photocurrent. It shows negative photoconductivity nature of PTPT crystal. The etching analysis was executed on (001) plane of PTPT crystal. It has rectangular shape etch pits patterns.
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Affiliation(s)
- S Chinnasami
- Centre for Crystal Growth, Department of Physics, SSN College of Engineering, Kalavakkam, Tamilnadu 603 110, India
| | - M Manikandan
- Centre for Crystal Growth, Department of Physics, SSN College of Engineering, Kalavakkam, Tamilnadu 603 110, India
| | - Senthilkumar Chandran
- Centre for Crystal Growth, Department of Physics, SSN College of Engineering, Kalavakkam, Tamilnadu 603 110, India
| | - Rajesh Paulraj
- Centre for Crystal Growth, Department of Physics, SSN College of Engineering, Kalavakkam, Tamilnadu 603 110, India.
| | - P Ramasamy
- Centre for Crystal Growth, Department of Physics, SSN College of Engineering, Kalavakkam, Tamilnadu 603 110, India
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Fathima Rizwana B, Prasana JC, Abraham CS, Muthu S. Spectroscopic investigation, hirshfeld surface analysis and molecular docking studies on anti-viral drug entecavir. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.090] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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17
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Demircioğlu Z, Özdemir FA, Dayan O, Şerbetçi Z, Özdemir N. Synthesis, X-ray diffraction method, spectroscopic characterization (FT-IR, 1H and 13C NMR), antimicrobial activity, Hirshfeld surface analysis and DFT computations of novel sulfonamide derivatives. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.02.063] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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18
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Abraham CS, Prasana JC, Muthu S. Quantum mechanical, spectroscopic and docking studies of 2-Amino-3-bromo-5-nitropyridine by Density Functional Method. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 181:153-163. [PMID: 28359904 DOI: 10.1016/j.saa.2017.03.045] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 03/10/2017] [Accepted: 03/17/2017] [Indexed: 06/07/2023]
Abstract
Experimental and theoretical investigations on the molecular structure, electronic and vibrational characteristics of 2-Amino-3-bromo-5-nitropyridine are presented. The vibrational frequencies were obtained by DFT/B3LYP calculations employing 6-311++G (d, p) basis set. This was compared with experimental FT-IR and FT-Raman spectral data. Simulated FT-IR (4000-400cm-1) and FT-Raman spectra (4000-100cm-1) showed good agreement with the observed spectra. The molecular equilibrium geometry of the title compound was fully optimized. Quantum chemical calculations of the equilibrium geometry and the complete vibrational assignments of wavenumbers using potential energy distribution (PED) were calculated with scaled quantum mechanics. HOMO-LUMO energies, energy gap (ΔE), electronegativity (χ), chemical potential (μ), global hardness (η), softness (S) and the Fukui function were calculated for the title molecule. The title compound has a low softness value (0.239) and the calculated value of electrophilicity index (5.905) describes the biological activity. The stability and charge delocalization of the title molecule were studied by Natural Bond Orbital (NBO) analysis, Non-Linear Optical (NLO) behaviour in terms of first order hyperpolarizability, dipole moment and anisotropy of polarizability and Molecular Electrostatic Potential (MEP) were accounted. The computed values of μ, α and β for the title molecule are 1.851 Debye, 1.723×10-23esu and 7.428×10-30esu respectively. The high β value and non-zero value of μ indicate that the title compound might be a good candidate for NLO material. Thermodynamic properties of the title molecule were studied for different temperatures thereby revealing the correlations between heat capacity (C), entropy (S) and enthalpy changes (H) with temperatures. Docking studies of the title compound were scrutinized to predict the preferred binding orientation, affinity and activity of the given compound. The title compound was docked into the active site of the protein 5FCT which belongs to the class of proteins exhibiting the property as a Dihydrofolate synthase inhibitor. A minimum binding energy of -5.9kcal/mol and intermolecular energy of -6.5kcal/mol is seen in the interaction.
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Affiliation(s)
| | | | - S Muthu
- Department of Physics, Arignar Anna Government Arts College, Cheyyar 604407, Tamil Nadu, India.
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Raja M, Raj Muhamed R, Muthu S, Suresh M, Muthu K. Synthesis, spectroscopic (FT-IR, FT-Raman, NMR, UV–Visible), Fukui function, antimicrobial and molecular docking study of (E)-1-(3-bromobenzylidene)semicarbazide by DFT method. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.10.045] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Raja M, Muhamed RR, Muthu S, Suresh M. Synthesis, spectroscopic (FT-IR, FT-Raman, NMR, UV–Visible), first order hyperpolarizability, NBO and molecular docking study of (E)-1-(4-bromobenzylidene)semicarbazide. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.09.017] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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21
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Zaltariov MF, Cojocaru C, Shova S, Sacarescu L, Cazacu M. Synthesis, structural characterization and quantum chemical studies of silicon-containing benzoic acid derivatives. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.05.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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22
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A computational evidence of the intermolecular/intramolecular hydrogen bonding in salicylsalicylic acid: chemical shielding tensors and AIM analysis. MONATSHEFTE FUR CHEMIE 2015. [DOI: 10.1007/s00706-015-1466-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Muthu S, Elamurugu Porchelvi E, Karabacak M, Asiri A, Swathi SS. Synthesis, structure, spectroscopic studies (FT-IR, FT-Raman and UV), normal coordinate, NBO and NLO analysis of salicylaldehyde p-chlorophenylthiosemicarbazone. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.10.024] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Porchelvi EE, Muthu S. Vibrational spectra, molecular structure, natural bond orbital, first order hyperpolarizability, thermodynamic analysis and normal coordinate analysis of Salicylaldehyde p-methylphenylthiosemicarbazone by density functional method. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 134:453-464. [PMID: 25033238 DOI: 10.1016/j.saa.2014.06.018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 05/25/2014] [Accepted: 06/03/2014] [Indexed: 06/03/2023]
Abstract
The thiosemicarbazone compound, Salicylaldehyde p-methylphenylthiosemicarbazone (abbreviated as SMPTSC) was synthesized and characterized by FTIR, FT-Raman and UV. Density functional (DFT) calculations have been carried out for the title compound by performing DFT level of theory using B3LYP/6-31++G(d,p) basis set. The molecular geometry and vibrational frequencies were calculated and compared with the experimental data. The detailed interpretation of the vibrational spectra has been carried out with aid of normal coordinate analysis (NCA) following the scaled quantum mechanical force field methodology. The electronic dipole moment (μD) and the first hyperpolarizability (βtot) values of the investigated molecule were computed using density functional theory (DFT/B3LYP) with 6-311++G(d,p) basis set. The stability and charge delocalization of the molecule was studied by natural bond orbital (NBO) analysis. Thearomaticities of the phenyl rings were studied using the standard harmonic oscillator model of aromaticity (HOMA) index. Mulliken population analysis on atomic charges is also calculated. The molecule orbital contributions are studied by density of energy states (DOSs).
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Affiliation(s)
- E Elamurugu Porchelvi
- Department of Physics, Anna University, Chennai, Tamil Nadu, India; Department of Physics, Kanchi Pallavan Engineering College, Kanchipuram 631502, Tamil Nadu, India
| | - S Muthu
- Department of Physics, Sri Venkateswara College of Engg, Sriperumbudur 602105, Tamil Nadu, India.
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Muthu S, Prabhakaran A. Vibrational spectroscopic study and NBO analysis on tranexamic acid using DFT method. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 129:184-192. [PMID: 24747330 DOI: 10.1016/j.saa.2014.03.050] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/01/2014] [Accepted: 03/20/2014] [Indexed: 06/03/2023]
Abstract
In this work, we reported the vibrational spectra of tranexamic acid (TA) by experimental and quantum chemical calculation. The solid phase FT-Raman and FT-IR spectra of the title compound were recorded in the region 4000 cm(-1) to 100 cm(-1) and 4000 cm(-1) to 400 cm(-1) respectively. The molecular geometry, harmonic vibrational frequencies and bonding features of TA in the ground state have been calculated by using density functional theory (DFT) B3LYP method with standard 6-31G(d,p) basis set. The scaled theoretical wavenumber showed very good agreement with the experimental values. The vibrational assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes. Stability of the molecule, arising from hyperconjugative interactions and charge delocalization, has been analyzed using Natural Bond Orbital (NBO) analysis. The results show that ED in the σ(*) and π(*) antibonding orbitals and second order delocalization energies E(2) confirm the occurrence of intramolecular charge transfer (ICT) within the molecule. The electrostatic potential mapped onto an isodensity surface has been obtained. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. The thermodynamic properties (heat capacity, entropy, and enthalpy) of the title compound at different temperatures were calculated in gas phase.
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Affiliation(s)
- S Muthu
- Department of Physics, Sri Venkateswara College of Engg, Sriperumbudur 602 105, India.
| | - A Prabhakaran
- Department of Physics, Pallavan College of Engg, Kanchipuram 631 502, India; Research and Development Center, Bharathiar University, Coimbatore 641 046, India
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Karabacak M, Sinha L, Prasad O, Asiri AM, Cinar M, Shukla VK. FT-IR, FT-Raman, NMR, UV and quantum chemical studies on monomeric and dimeric conformations of 3,5-dimethyl-4-methoxybenzoic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 123:352-362. [PMID: 24412788 DOI: 10.1016/j.saa.2013.12.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 12/05/2013] [Accepted: 12/09/2013] [Indexed: 06/03/2023]
Abstract
Extensive spectroscopic investigations along with theoretical quantum chemical studies on 3,5-dimethyl-4-methoxybenzoic acid (DMMBA) have been consummated. The fundamental vibrational transitions were addressed by experimental FT-IR (4000-400cm(-1)) and FT-Raman (4000-10cm(-1)) techniques and density functional calculations at B3LYP/6-311++G(d,p) and B3LYP/6-311++G(df,pd) levels of theory. The (1)H, (13)C and DEPT 135 NMR spectra of studied compound were recorded in deuterated dimethylsulfoxide (DMSO-d6), and compared with computed data obtained by using gauge including atomic orbital (GIAO) method. The electronic absorption spectra in methanol and ethanol solution were evaluated in the range of 200-400nm, and TD-DFT method was chosen for computational study. The spectroscopic and theoretical results were compared to the corresponding properties for monomer and dimer structures for the most stable conformer. Stability of the molecule arising from hyperconjugative interactions and charge delocalization has been analyzed using natural bond orbital (NBO) analysis. Moreover, the thermodynamic and nonlinear optical (NLO) properties were evaluated.
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Affiliation(s)
- Mehmet Karabacak
- Department of Mechatronics Engineering, H.F.T. Technology Faculty, Celal Bayar University, Turgutlu, Manisa, Turkey.
| | - Leena Sinha
- Department of Physics, University of Lucknow, Lucknow, India
| | - Onkar Prasad
- Department of Physics, University of Lucknow, Lucknow, India
| | - Abdullah M Asiri
- Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia; Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mehmet Cinar
- Department of Science Education, Bayburt University, Bayburt, Turkey
| | - Vikas K Shukla
- Department of Physics, University of Lucknow, Lucknow, India
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Muthu S, Paulraj EI. Molecular structure and spectroscopic characterization of ethyl 4-aminobenzoate with experimental techniques and DFT quantum chemical calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 112:169-181. [PMID: 23666352 DOI: 10.1016/j.saa.2013.04.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 03/17/2013] [Accepted: 04/02/2013] [Indexed: 06/02/2023]
Abstract
The FT-IR and FT-Raman spectra of ethyl 4-aminobenzoate (EAB) in the solid phase were recorded. The fundamental vibrational wavenumbers, intensities of vibrational bands and the optimized geometrical parameters of the compound were evaluated using DFT (B3LYP) method with 6-311++G(d,p) basis set. The stable geometry of the compound was determined from the potential energy surface scan. Complete vibrational assignments and Natural Bond Orbital (NBO) analysis for the title compound were carried out. The assignments of the vibrational spectra were carried out with the help of normal co-ordinate analysis (NCA) following the Scaled Quantum Mechanical Force Field (SQMFF) methodology. The molecule orbital contributions were studied by using the total (TDOS), partial (PDOS), and overlap population (OPDOS) density of states. UV-visible spectrum of the compound was recorded and the electronic properties, such as HOMO and LUMO energies were performed by time-dependent DFT (TD-DFT) approach. Mulliken population analysis on atomic charges were also calculated. Besides, molecular electrostatic potential (MEP) and thermodynamic properties were performed.
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Affiliation(s)
- S Muthu
- Department of Applied Physics, Sri Venkateswara College of Engineering, Sriperumbudur 602 105, Tamil Nadu, India
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Sheela NR, Sampathkrishnan S, Thirumalai Kumar M, Muthu S. Quantum mechanical study of the structure and spectroscopic, first order hyperpolarizability, Fukui function, NBO, normal coordinate analysis of phenyl-N-(4-methyl phenyl) nitrone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 112:62-77. [PMID: 23659952 DOI: 10.1016/j.saa.2013.04.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 03/20/2013] [Accepted: 04/01/2013] [Indexed: 06/02/2023]
Abstract
The title compound, Phenyl-N-(4-Methyl Phenyl) Nitrone (PN4MPN) was synthesized and characterized by FT-IR, FT-Raman and (1)HNMR, (13)CNMR spectral analysis. The molecular geometry, harmonic vibrational frequencies and bonding features of the title compound in the ground state are computed at the Hartree-Fock/6-311++G(d,p) and three parameter hybrid functional Lee-Yang-Parr/6-311++G(d,p) levels of theory. The calculated results show that the predicted geometry can well reproduce the structural parameters. The assignments of the vibrational spectra have been carried out with the help of normal co-ordinate analysis (NCA) following the scaled quantum mechanical force field methodology (SQMF). The calculated HOMO and LUMO energies confirm that charge transfer occurs within the molecule. The dipole moment (μ), polarizability (α) and hyperpolarizability (β) of the investigated molecule is calculated by using HF/6-311++G(d,p) and B3LYP/6-311++G(d,p) methods on the finite field approach. Besides, Molecular Electrostatic Potential (MEP), Natural Bond Orbital analysis (NBO) and thermodynamical properties are described from the computational process. The electron density-based local reactivity descriptor such as Fukui functions are calculated to explain the chemical selectivity or reactivity site in PN4MPN. Finally, the calculations are applied to simulated FT-IR and FT-Raman spectra of the title compound which show good agreement with observed spectra.
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Affiliation(s)
- N R Sheela
- Department of Applied Physics, Sri Venkateswara College of Engineering, Sriperumbudur 602 105, India
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