1
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Hybrid proton-containing decavanadate-organic crystal: synthesis, structure and enhancement of proton-conducting performance. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2023. [DOI: 10.1007/s13738-023-02759-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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2
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Romeu MC, Freire PT, Ayala AP, Barreto AC, Oliveira LS, de Oliveira MR, Bandeira PN, dos Santos HS, Teixeira AM, Vasconcelos DL. Synthesis, crystal structure and ATR-FTIR, FT-Raman and UV–Vis spectroscopic analysis of dihydrochalcone (3R)-3-(4-chlorophenyl)-3-hydroxy-1-(2-hydroxyphenyl)propan-1-one. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Theoretical studies, Hirshfeld surface analysis, and crystal structure determination of a newly synthesized benzothiazole copper(II) complex. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132905] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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4
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Liu Q, Wang J, Chong Y, Liu J. Inhibition effect of green Betaine type surfactants on Q235 steel in 1 mol·L−1 hydrochloric acid: The experimental and theoretical research. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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The inhibition performance of heterocyclic compounds on Q235 steel in methanol/formic acid medium: Experimental and theory. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117663] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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6
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Structural and spectroscopic analysis of the Cis-Trans isomers of the captopril in the gaseous and aqueous phases. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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7
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Computational investigation of molecular structures, spectroscopic properties, cholinesterase inhibition and antibacterial activities of triazole Schiff bases endowed metal chelates. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130382] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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8
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Moreno‐Fuquen R, Morales V, Loaiza A, Tenorio JC, Goddard R. Spectroscopic (FTIR and UV‐Vis) Analysis, Supramolecular Studies, XRD Structural Characterization and Theoretical Studies of Two Flavone‐Oxime Derivatives. ChemistrySelect 2020. [DOI: 10.1002/slct.202000608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Rodolfo Moreno‐Fuquen
- Grupo de Cristalografía. Departamento de QuímicaUniversidad del Valle Calle 13 Carrera 100. AA 25630 Cali Colombia
| | - Vanessa Morales
- Grupo de Cristalografía. Departamento de QuímicaUniversidad del Valle Calle 13 Carrera 100. AA 25630 Cali Colombia
| | - Alix Loaiza
- Laboratorio de Sintesis OrgánicaFacultad de CienciasPontificia Universidad Javeriana Bogotá, DC Colombia
| | | | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim an der Ruhr Germany
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9
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Sumrra SH, Sahrish I, Raza MA, Ahmad Z, Zafar MN, Chohan ZH, Khalid M, Ahmed S. Efficient synthesis, characterization, and in vitro bactericidal studies of unsymmetrically substituted triazole-derived Schiff base ligand and its transition metal complexes. MONATSHEFTE FUR CHEMIE 2020. [DOI: 10.1007/s00706-020-02571-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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10
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Synthesis, molecular structure, anti-microbial, anti-oxidant and enzyme inhibition activities of 2-amino-6-methylbenzothiazole and its Cu(II) and Ag(I) complexes. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.126956] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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11
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Khamees HA, Mohammed YHE, Swamynayaka A, Al‐Ostoot FH, Sert Y, Alghamdi S, Khanum SA, Madegowda M. Molecular Structure, DFT, Vibrational Spectra with Fluorescence Effect, Hirshfeld Surface, Docking Simulation and Antioxidant Activity of Thiazole Derivative. ChemistrySelect 2019. [DOI: 10.1002/slct.201900646] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hussien A. Khamees
- Department of Studies in PhysicsManasagangotriUniversity of Mysore Mysuru-570006, Karnataka India
| | - Yasser H. E. Mohammed
- Department of ChemistryYuvaraja's CollegeUniversity of Mysore Mysuru- 570005 Karnataka India
- Department of BiochemistryFaculty of Applied Science CollegeUniversity of Hajjah Yemen
| | - Ananda Swamynayaka
- Department of Studies in PhysicsManasagangotriUniversity of Mysore Mysuru-570006, Karnataka India
| | - Fares H. Al‐Ostoot
- Department of ChemistryYuvaraja's CollegeUniversity of Mysore Mysuru- 570005 Karnataka India
- Department of BiochemistryFaculty of Education & ScienceUniversity of Albaydaa Yemen
| | - Yusuf Sert
- Sorgun Vocational SchoolBozok University 66100, Yozgat Turkey
| | - Saad Alghamdi
- Laboratory Medicine Departmentfaculty of Applied Medical ScienceUmm Al-Qura University, Makkah Saudi Arabia
| | - Shaukath A. Khanum
- Department of ChemistryYuvaraja's CollegeUniversity of Mysore Mysuru- 570005 Karnataka India
| | - Mahendra Madegowda
- Department of Studies in PhysicsManasagangotriUniversity of Mysore Mysuru-570006, Karnataka India
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12
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Bharti S, Choudhary M, Mohan B, Rawat S, Sharma S, Ahmad K. Syntheses, spectroscopic characterization, SOD-like properties and antibacterial activities of dimer copper (II) and nickel (II) complexes based on imine ligands containing 2-aminothiophenol moiety: X-ray crystal structure determination of disulfide Schiff bases. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.041] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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13
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Benzthiazoline-2-thione (BTT) revisited: An experimental and theoretical endeavor to understand UV-spectra. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.08.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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14
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Dhandapani A, Manivarman S, Subashchandrabose S. Synthesis, crystal growth, structural evaluation and nonlinear optical analysis of ethyl-4-(3,4-dimethoxyphenyl)-6-methyl-2-sulfanylidene-3,4-dihydro-1H-pyrimidine-5-carboxylate. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.07.084] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Molecular structural investigation of adenosine using spectroscopic and quantum computational calculations. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.04.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Tejaswi S, Kumar MP, Rambabu A, Vamsikrishna N, Shivaraj. Synthesis, Structural, DNA Binding and Cleavage Studies of Cu(II) Complexes Containing Benzothiazole Cored Schiff Bases. J Fluoresc 2016; 26:2151-2163. [DOI: 10.1007/s10895-016-1911-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 08/15/2016] [Indexed: 01/17/2023]
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17
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Prediction of molecular properties and spectroscopic profile of Riluzole with different functionals (B3LYP, M06-2X, MPWLYP): A combined theoretical and experimental study. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.10.088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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18
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Synthesis, spectroscopic characterization and DFT calculations of N-Methyl-2-(2ʹ-hydroxyphenyl)benzimidazole derivatives. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.09.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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19
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Synthesis, spectroscopic investigations and computational study of monomeric and dimeric structures of 2-methyl-4-quinolinol. RESEARCH ON CHEMICAL INTERMEDIATES 2015. [DOI: 10.1007/s11164-015-2084-4] [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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20
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Anitha EG, Vedhagiri SJ, Parimala K. Conformational stability, vibrational spectra, NLO properties, NBO and thermodynamic analysis of 2-amino-5-bromo-6-methyl-4-pyrimidinol for dye sensitized solar cells by DFT methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 140:544-562. [PMID: 25645233 DOI: 10.1016/j.saa.2014.12.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2014] [Revised: 11/29/2014] [Accepted: 12/10/2014] [Indexed: 06/04/2023]
Abstract
The Fourier transform infrared (FT-IR) and Fourier transform Raman (FT-Raman) spectra of 2-amino-5-bromo-6-methyl-4-pyrimidinol (ABrMP) were recorded in the region 4000-400 and 3500-100 cm(-1), respectively. The conformational stability, geometrical structure, vibrational frequencies, infrared intensities and Raman activities were carried out by DFT (B3LYP and LSDA) methods with 6-311++G(d,p) basis set. The calculated results show good agreement with observed spectra. The charge delocalization have been analyzed using NBO analysis by LSDA/6-311++G(d,p) level of theory. The NLO properties (μ, α0, Δα, β0 and βvec) have been computed quantum mechanically. The calculated HOMO and LUMO energies show that, the charge transfer occurs within the molecule. The solvent effects have been calculated using TD-DFT and the results are in good agreement with experimental measurements. The other molecular properties like Mulliken population analysis, electrostatic potential (ESP) and thermodynamic properties of the title compound at the different temperatures have been calculated.
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Affiliation(s)
| | | | - K Parimala
- Department of Physics, Mookambigai College of Engineering, Kalamavur 622502, India.
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21
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Kanaani A, Ajloo D, Ghasemian H, Kiyani H, Vakili M, Mosallanezhad A. Synthesis, molecular structure, spectroscopic investigations and computational studies of (E)-1-(4-(4-(diethylamino)-2-hydroxybenzylideneamino)phenyl)ethanone. Struct Chem 2015. [DOI: 10.1007/s11224-015-0571-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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22
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Sachan AK, Pathak SK, Chand S, Srivastava R, Prasad O, Belaidi S, Sinha L. Molecular structure, vibrational and electronic properties of 4-Phenyl-3H-1,3-thiazol-2-ol using density functional theory and comparison of drug efficacy of keto and enol forms by QSAR analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 132:568-581. [PMID: 24892536 DOI: 10.1016/j.saa.2014.05.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 04/23/2014] [Accepted: 05/02/2014] [Indexed: 06/03/2023]
Abstract
4-Phenyl-3H-1,3-thiazol-2-ol can exist in two tautomeric forms - keto and enol. Comprehensive investigation of molecular geometry and electronic structure in ground as well as in the first excited state of 4-Phenyl-3H-1,3-thiazol-2-ol (enol) has been carried out. To determine lowest-energy molecular conformation of the title molecule, the selected torsion angles were varied in steps of 10° and molecular energy profile was calculated from -180° to +180°. Experimental FT-IR and FT-Raman spectra of title compound were compared with the spectral data obtained by DFT/B3LYP method. Dipole moment, polarizability, first static hyperpolarizability and molecular electrostatic potential surface map have been calculated to get a better insight of the properties of title molecule. Natural bond orbital (NBO) analysis has been done to study the stability of the molecule arising from charge delocalization. UV-Vis spectrum of the title compound was also recorded and electronic properties such as frontier orbitals and band gap energies were calculated by TD-DFT approach. To compare the drug efficacy of enolic and keto forms, QSAR properties of both forms have also been computed and discussed.
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Affiliation(s)
- Alok K Sachan
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | | | - Satish Chand
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - Ruchi Srivastava
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - Onkar Prasad
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - Salah Belaidi
- Group of Computational and Pharmaceutical Chemistry, LMCE Laboratory, Faculty of Sciences, University of Biskra, 07000 Biskra, Algeria
| | - Leena Sinha
- Department of Physics, University of Lucknow, 226007 Lucknow, India.
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23
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Transition Metal(II) Complexes of a Novel Symmetrical Benzothiazole-Based Ligand: Synthesis, Spectral/Structural Characterization and Fluorescence Properties. J Fluoresc 2014; 24:1679-86. [DOI: 10.1007/s10895-014-1455-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 09/04/2014] [Indexed: 02/02/2023]
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24
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Lizarraga E, Gil DM, Echeverría GA, Piro OE, Catalán CAN, Ben Altabef A. Synthesis, crystal structure, conformational and vibrational properties of 6-acetyl-2,2-dimethyl-chromane. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 127:74-84. [PMID: 24632159 DOI: 10.1016/j.saa.2014.02.035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 02/04/2014] [Accepted: 02/14/2014] [Indexed: 05/04/2023]
Abstract
The 6-acetyl-2,2-dimethyl-chromane compound was synthesized and characterized by IR, Raman, UV-Visible and (1)H NMR spectroscopies. Its solid state structure was determined by X-ray diffraction methods. The substance crystallizes in the triclinic P-1 space group with a=5.9622(5) Å, b=10.342(1) Å, c=10.464(1) Å, α=63.81(1)°, β=81.923(9)°, γ=82.645(9)°, and Z=2 molecules per unit cell. Due to extended π-bonding delocalization a substantial skeletal fragment of the molecule is planar. The vibrational modes were calculated at B3LYP/6-31G(d,p) level and all of them assigned in the IR and Raman spectra. The DFT calculated (1)H NMR spectrum (chemical shifts) were in good agreement with the experimental data. The electronic (UV-Visible) spectrum was calculated using TD-DFT method in gas phase and it was correlated with the experimental data. The assignment and analysis of the frontier HOMO and LUMO orbitals indicate that the absorption bands are mainly originated from π→π(*) transitions. According to DSC measurements the substance presents a melting point of 93°C and decomposes at temperatures higher than 196°C.
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Affiliation(s)
- Emilio Lizarraga
- INQUINOA, CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, San Lorenzo 456, T4000CAN Tucumán, Argentina
| | - Diego M Gil
- INQUINOA, CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, San Lorenzo 456, T4000CAN Tucumán, Argentina
| | - Gustavo A Echeverría
- Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata and Institute IFLP (CONICET, CCT-La Plata), C.C. 67, 1900 La Plata, Argentina
| | - Oscar E Piro
- Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata and Institute IFLP (CONICET, CCT-La Plata), C.C. 67, 1900 La Plata, Argentina
| | - César A N Catalán
- INQUINOA, CONICET, Instituto de Química Orgánica, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 471, T4000INI Tucumán, Argentina
| | - Aída Ben Altabef
- INQUINOA, CONICET, Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, San Lorenzo 456, T4000CAN Tucumán, Argentina.
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25
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Fan F, Wang C. UV-Vis irradiation fatigue resistance improvement of azo photochromic compound using polyurethane-chitosan double shell encapsulation. J Appl Polym Sci 2014. [DOI: 10.1002/app.40895] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Fei Fan
- Colleage of Textiles and Clothing, Key Laboratory of Eco-Textile; Ministry of Education, Jiangnan University; Wuxi 214122 People's Republic of China
| | - Chaoxia Wang
- Colleage of Textiles and Clothing, Key Laboratory of Eco-Textile; Ministry of Education, Jiangnan University; Wuxi 214122 People's Republic of China
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26
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Arjunan V, Raj A, Ravindran P, Mohan S. Structure-activity relations of 2-(methylthio)benzimidazole by FTIR, FT-Raman, NMR, DFT and conceptual DFT methods. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 118:951-965. [PMID: 24184580 DOI: 10.1016/j.saa.2013.09.100] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 09/11/2013] [Accepted: 09/26/2013] [Indexed: 06/02/2023]
Abstract
The vibrational fundamental modes of 2-(methylthio)benzimidazole (2MTBI) have been analysed by combining FTIR, FT-Raman and quantum chemical calculations. The structural parameters of the compound are determined from the optimised geometry by B3LYP with 6-31G(∗∗), 6-311++G(∗∗) and cc-pVTZ basis sets and giving energies, harmonic vibrational frequencies, depolarisation ratios, IR intensities and Raman activities. (1)H and (13)C NMR spectra have been analysed and (1)H and (13)C nuclear magnetic resonance chemical shifts are calculated using the gauge independent atomic orbital (GIAO) method. The structure-activity relationship of the compound is also investigated by conceptual DFT methods. The chemical reactivity and site selectivity of the molecule has been determined with the help of global and local reactivity descriptors.
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Affiliation(s)
- V Arjunan
- Department of Chemistry, Kanchi Mamunivar Centre for Post-Graduate Studies, Puducherry 605 008, India.
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27
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Sebastian S, Sylvestre S, Oudayakumar K, Jayavarthanan T, Karthikeyan B, Sundaraganesan N. Molecular structure, vibrational spectra and first-order hyperpolarisability analysis of 2-amino-6-nitrobenzothiazole by DFT method. MOLECULAR SIMULATION 2013. [DOI: 10.1080/08927022.2013.794271] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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28
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Sinha L, Prasad O, Karabacak M, Mishra HN, Narayan V, Asiri AM. Quantum-chemical (DFT, MP2) and spectroscopic studies (FT-IR and UV) of monomeric and dimeric structures of 2(3H)-Benzothiazolone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 120:126-136. [PMID: 24177879 DOI: 10.1016/j.saa.2013.09.125] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Revised: 09/26/2013] [Accepted: 09/27/2013] [Indexed: 06/02/2023]
Abstract
Molecular geometry and vibrational wavenumbers of 2(3H)-Benzothiazolone (C7H5NSO, HBT) was investigated using density functional (DFT/B3LYP) method with 6-311+G(d,p) basis set. The vibrational wavenumbers are found to be in good agreement with experimental FT-IR spectra. Hydrogen-bonded dimer of HBT, optimized by counterpoise correction, was studied by MP2 and DFT/B3LYP at the 6-311+G(d,p) level and the effects of molecular association through NH---O hydrogen bonding were discussed. A detailed analysis of the nature of the hydrogen bonding, using topological parameters, such as electronic charge density, Laplacian, kinetic and potential energy density evaluated at bond critical points (BCP) has also been presented. The UV absorption spectra of the compound dissolved in ethanol and chloroform solutions were recorded in the range of 200-600 nm. The UV-vis spectrum of the title molecule was also calculated using TD-DFT method. The calculated energy and oscillator strength almost exactly reproduce the experimental data. Total and partial density of state (TDOS, PDOS) of the HBT in terms of HOMOs and LUMOs and molecular electrostatic potential (MEP) were calculated and analyzed. The electric dipole moment, polarizability and the first static hyper-polarizability values for HBT were calculated at the DFT/B3LYP with 6-311+G(d,p) basis set. The results also show that the HBT molecule may have nonlinear optical (NLO) comportment with non-zero values. Stability of the molecule arising from hyper-conjugative interactions and charge delocalization was analyzed using natural bond orbital (NBO) analysis.
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Affiliation(s)
- L Sinha
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - O Prasad
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - M Karabacak
- Department of Mechatronics Engineering, H.F.T. Technology Faculty, Celal Bayar University, 45400 Turgutlu, Manisa, Turkey.
| | - H N Mishra
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - V Narayan
- Department of Physics, University of Lucknow, 226007 Lucknow, India
| | - A 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
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29
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Sui H, Zhong F, Cheng K, Liu X, Ju X. IR vibrational assignments for 1,3,5-triamine-2,4,6-trinitrobenzene (TATB) based on the temperature-dependent frequency shifts. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 114:137-143. [PMID: 23770499 DOI: 10.1016/j.saa.2013.05.067] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 05/03/2013] [Accepted: 05/19/2013] [Indexed: 06/02/2023]
Abstract
IR spectra of TATB at different temperature were investigated for vibrational assignments. The results showed that the hydrogen bonding interaction of TATB was significantly weakened with increasing the temperature. Based on the frequency shifts of the hydrogen bonding interaction to several vibrational modes, 12 absorbance bands in the region 600-1700 cm(-1) were assigned to corresponding vibrational modes. In addition, Fermi resonance effect between NO2 and NH2 scissors was observed, and the enhancement of Fermi resonance effect caused the intensity of v3 (at 1545 cm(-1)) to grow during heating.
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Affiliation(s)
- Heliang Sui
- Department of Physics, University of Science and Technology Beijing, Beijing 100083, China
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30
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Afifi MS, Farag RS, Shaaban IA, Wilson LD, Zoghaib WM, Mohamed TA. Infrared and NMR spectra, tautomerism, vibrational assignment, normal coordinate analysis, and quantum mechanical calculations of 4-amino-5-pyrimidinecarbonitrile. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 111:277-289. [PMID: 23669406 DOI: 10.1016/j.saa.2013.04.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 03/27/2013] [Accepted: 04/01/2013] [Indexed: 06/02/2023]
Abstract
The infrared (4000-200 cm(-1)) spectrum for 4-amino-5-pyrimidinecarbonitrile (APC, C5H4N4) was acquired in the solid phase. In addition, the (1)H and (13)C NMR spectra of APC were obtained in DMSO-d6 along with its mass spectrum. Initially, six isomers were hypothesized and then investigated by means of DFT/B3LYP and MP2(full) quantum mechanical calculations using a 6-31G(d) basis set. Moreover, the (1)H and (13)C NMR chemical shifts were predicted using a GIAO approximation at the 6-311+G(d,p) basis set and the B3LYP method with (and without) solvent effects using PCM method. The correlation coefficients showed good agreement between the experimental/theoretical chemical shift values of amino tautomers (1 and 2) rather than the eliminated imino tautomers (3-6), in agreement with the current quantum mechanical calculations. Structures 3-6 are less stable than the amino tautomers (1 and 2) by about 5206-8673 cm(-1) (62.3-103.7 kJ/mol). The MP2(full)/6-31G(d) computational results favor the amino structure 1 with a pyramidal NH2 moiety and calculated real vibrational frequencies, however; structure 2 is considered a transition state owing to the calculated imaginary frequency. It is worth mentioning that, the calculated structural parameters suggest a strong conjugation between the amino nitrogen and pyrimidine ring. Aided by frequency calculations, normal coordinate analysis, force constants and potential energy distributions (PEDs), a complete vibrational assignment for the observed bands is proposed herein. Finally, NH2 internal rotation barriers for the stable non-planar isomer (1) were carried out using MP2(full)/6-31G(d) optimized structural parameters. Our results are discussed herein and compared to structural parameters for similar molecules whenever appropriate.
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Affiliation(s)
- Mahmoud S Afifi
- Department of Chemistry, Faculty of Science (Men's Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt
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Gobinath E, Xavier RJ. Quantum chemical calculations, vibrational studies, HOMO-LUMO and NBO/NLMO analysis of 2-bromo-5-nitrothiazole. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 104:394-402. [PMID: 23274373 DOI: 10.1016/j.saa.2012.11.066] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2012] [Revised: 11/10/2012] [Accepted: 11/16/2012] [Indexed: 06/01/2023]
Abstract
The complete vibrational assignment and analysis of the fundamental modes of 2-bromo-5-nitrothiazole (BNT) was carried out using the experimental FTIR and FT-Raman data and quantum chemical studies. The observed vibrational data were compared with the wavenumbers derived theoretically for the optimized geometry of the compound from the ab initio HF and DFT-B3LYP gradient calculations employing 6-311++G(d,p) basis set. Thermodynamic properties like entropy, heat capacity and zero point energy have been calculated for the molecule. HOMO-LUMO energy gap has been calculated. The intramolecular contacts have been interpreted using Natural Bond Orbital (NBO) and Natural Localized Molecular Orbital (NLMO) analysis. Important non-linear properties such as electric dipole moment and first hyperpolarizability of BNT have been computed using B3LYP quantum chemical calculation.
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Affiliation(s)
- E Gobinath
- Department of Physics, Jayaram College of Engineering and Technology, Tiruchirappalli 621 014, India
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Arjunan V, Raj A, Santhanam R, Marchewka MK, Mohan S. Structural, vibrational, electronic investigations and quantum chemical studies of 2-amino-4-methoxybenzothiazole. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 102:327-340. [PMID: 23220675 DOI: 10.1016/j.saa.2012.09.076] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 09/18/2012] [Accepted: 09/22/2012] [Indexed: 06/01/2023]
Abstract
Extensive vibrational investigations of 2-amino-4-methoxybenzothiazole have been carried out with FTIR and FT-Raman spectral techniques. The electronic structure of the molecule has been analysed by UV-Visible and NMR spectroscopies. The DFT studies were carried out with B3LYP and HF methods utilising 6-31G(d,p), 6-311++G(d,p) and cc-pVDZ basis sets to determine the structural, thermodynamical, vibrational, electronic characteristics of the compound and also to understand the electronic and steric influence of the methoxy amino groups on the skeletal frequencies. The mixing of the fundamental modes was determined with the help of total energy distribution (TED). The energies of the frontier molecular orbitals have also been determined. The kinetic and thermodynamic stability and chemical hardness of the molecule have been determined. Complete NBO analysis was also carried out to find out the intramolecular electronic interactions and their stabilisation energy. (1)H and (13)C NMR chemical shifts and the electronic transitions of the molecule are also discussed.
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Affiliation(s)
- V Arjunan
- Department of Chemistry, Kanchi Mamunivar Centre for Post-Graduate Studies, Puducherry 605 008, India.
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