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Hamouda RA, Alharbi AA, Al-Tuwaijri MM, Makharita RR. The Antibacterial Activities and Characterizations of Biosynthesized Zinc Oxide Nanoparticles, and Their Coated with Alginate Derived from Fucus vesiculosus. Polymers (Basel) 2023; 15:polym15102335. [PMID: 37242910 DOI: 10.3390/polym15102335] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 05/07/2023] [Accepted: 05/12/2023] [Indexed: 05/28/2023] Open
Abstract
Zinc oxide nanoparticles have many advantages for nano-biotechnologists due to their intense biomedical applications. ZnO-NPs are used as antibacterial agents, which influence bacterial cells through the rupture of the cell membrane and the generation of reactive free radicals. Alginate is a polysaccharide of natural origin due to its excellent properties that are used in various biomedical applications. Brown algae are good sources of alginate and are used as a reducing agent in the synthesis of nanoparticles. This study aims to synthesize ZnO-NPs by using brown alga Fucus vesiculosus (Fu/ZnO-NPs) and also to extract alginate from the same alga, which is used in coating the ZnO-NPs (Fu/ZnO-Alg-NCMs). The characterizations of Fu/ZnO-NPs and Fu/ZnO-Alg-NCMs were determined by FTIR, TEM, XRD, and zeta potential. The antibacterial activities were applied against multidrug resistance bacteria of both gram-positive and negative. The results obtained in FT-TR showed there are some shifts in the peak positions of Fu/ZnO-NPs and Fu/ZnO-Alg-NCMs. The peak at 1655 cm-1, which assigned amide I-III, is present in both Fu/ZnO-NPs and Fu-Alg-ZnO-NCMs; this band is responsible for bio-reductions and stabilization of both nanoparticles. The TEM images proved the Fu/ZnO-NPs have rod shapes with sizes ranging from 12.68 to 17.66 and are aggregated, but Fu/ZnO/Alg-NCMs are spherical in shape with sizes ranging from 12.13 to 19.77. XRD-cleared Fu/ZnO-NPs have nine sharp peaks that are considered good crystalline, but Fu/ZnO-Alg-NCMs have four broad and sharp peaks that are considered semi-crystalline. Both Fu/ZnO-NPs and Fu/ZnO-Alg-NCMs have negative charges (-1.74 and -3.56, respectively). Fu/ZnO-NPs have more antibacterial activities than Fu/ZnO/Alg-NCMs in all tested multidrug-resistant bacterial strains. Fu/ZnO/Alg-NCMs had no effect on Acinetobacter KY856930, Staphylococcus epidermidis, and Enterobacter aerogenes, whereas there was an apparent effect of ZnO-NPs against the same strains.
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Affiliation(s)
- Ragaa A Hamouda
- Department of Biology, College of Science and Arts at Khulis, University of Jeddah, Jeddah 21959, Saudi Arabia
- Genetic Engineering and Biotechnology Research Institute (GEBRI), University of Sadat City, Sadat City 32897, Egypt
| | - Asrar A Alharbi
- Department of Biology, College of Science and Arts at Khulis, University of Jeddah, Jeddah 21959, Saudi Arabia
| | - Majdah M Al-Tuwaijri
- Department of Biology, Faculty of Applied Science, Umm-Al-Qura University, Makkah Al-Mukarramah 21955, Saudi Arabia
| | - Rabab R Makharita
- Department of Biology, College of Science and Arts at Khulis, University of Jeddah, Jeddah 21959, Saudi Arabia
- Botany and Microbiology Department, Faculty of Science, Suez Canal University, Ismailia 41522, Egypt
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2
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Karpagavalli K, Daisy Magdaline J, Chithambarathanu T. Vibrational frequency Analysis, DFT and in Vitro Fungicidal Activity Studies of Biphenyl-4-Carboxylic Acid, 2,4-Difluorobiphenyl and 4-Acetylbiphenyl- A Comparative Study. Polycycl Aromat Compd 2023. [DOI: 10.1080/10406638.2023.2169474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Affiliation(s)
- K. Karpagavalli
- Research Department of Physics, Rani Anna Government College for Women, Tirunelveli, Tamil Nadu, India
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu, India
| | - J. Daisy Magdaline
- Research Department of Physics, Rani Anna Government College for Women, Tirunelveli, Tamil Nadu, India
- Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, Tamil Nadu, India
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3
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Chen R, Cheng L, Liu J, Wang Y, Ge W, Xiao C, Jiang H, Li Y, Li C. Toward High-Performance CO 2 -to-C 2 Electroreduction via Linker Tuning on MOF-Derived Catalysts. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2200720. [PMID: 35373471 DOI: 10.1002/smll.202200720] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Indexed: 06/14/2023]
Abstract
Copper (Cu)-based metal-organic frameworks (MOFs) and MOF-derived catalysts are well studied for electroreduction of carbon dioxide (CO2 ); however, the effects of organic linkers for the selectivity of CO2 reduction are still unrevealed. Here, a series of Cu-based MOF-derived catalysts is investigated with different organic linkers appended, named X-Cu-BDC (BDC = 1,4-benzenedicarboxylic acid, X = NH2 , OH, H, F, and 2F). It is found that the linkers affect the faradaic efficiency (FE) for C2 products with an order of NH2 < OH < bare Cu-BDC < F < 2F, thus tuning the FEC2 :FEC1 ratios from 0.6 to 3.8. As a result, the highest C2 FE of ≈63% at a current density of 150 mA cm-2 on 2F-Cu-BDC derived catalyst is achieved. Using operando Raman measurements, it is revealed that the MOF derives to Cu2 O during eCO2 RR but organic linkers are stable. The fluorine group in organic linker can promote the H2 O dissociation to *H species, further facilitating the hydrogenation of *CO to *CHO that helps CC coupling.
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Affiliation(s)
- Rongzhen Chen
- Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Ling Cheng
- School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Jinze Liu
- School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Yating Wang
- Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Wangxin Ge
- Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Chuqian Xiao
- Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Hao Jiang
- Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Yuhang Li
- Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
| | - Chunzhong Li
- Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
- School of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, P. R. China
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Manimozhi PK, Kavitha R, Thilagavathi R, Gokilavani GM. Theoretical, Experimental Studies on Molecular Structure and Vibrational Spectra of 2,6-Dibromo-4-Nitrophenol. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2022.2039228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- P. K. Manimozhi
- PG and Research Department of Physics, Seethalakshmi Ramaswami College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - R. Kavitha
- PG and Research Department of Physics, Seethalakshmi Ramaswami College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - R. Thilagavathi
- PG and Research Department of Physics, Seethalakshmi Ramaswami College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
| | - G. M. Gokilavani
- PG and Research Department of Physics, Seethalakshmi Ramaswami College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli, Tamil Nadu, India
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5
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Structural and energetic effect of the intramolecular hydrogen bonding in 4,6-dihaloresorcinols: ab initio calculation, vibrational spectroscopy, and molecular docking studies. Struct Chem 2021. [DOI: 10.1007/s11224-021-01820-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Xu X, Wang W, Luo J, Mohamadi A. Theoretical investigation of chemical functionalization BxCyNz (x = z = 1, y = 2) nanotube with pralines amino acid. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2021.113239] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Tyrosine amino acid as a sustainable material for chemical functionalization of single-wall BC2N nanotubes: quantum chemical study. Struct Chem 2021. [DOI: 10.1007/s11224-020-01691-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Experimental approach, theoretical investigation and molecular docking of 2- chloro-5-fluoro phenol antibacterial compound. Heliyon 2020; 6:e05464. [PMID: 33251354 PMCID: PMC7679262 DOI: 10.1016/j.heliyon.2020.e05464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 11/03/2020] [Accepted: 11/04/2020] [Indexed: 11/22/2022] Open
Abstract
The molecular structural dimerization of biologically potent 2-chloro-5-fluoro phenol (2C5FP) is optimized. A combined experimental and theoretical characteristics of vibrational spectral determinations (NMR, FT-IR and Raman) on 2-chloro-5-fluoro phenol (2C5FP) were used at DFT-B3LYP/6–31++G (d,p) level of computation. A close coherence is achieved when experimentally observed wave numbers are compared with calculated wave numbers by refinement of the scale factors. Calculated values of global chemical descriptors of the present molecule reveal significant molecular stability and chemical reactivity. Non-Linear optical (NLO) property of the present molecule is investigated by determining the second order non linear parameter of first hyperpolarizability β. Moreover, hydrogen bond and thermodynamic parameters at various temperatures are determined and discussed. Investigated compound 2C5FP possesses a better antibacterial activity against Echerichia coli, Streptococcus aureus, Pseudomonas aureus,and Staphylococcus aureus, respectively. The title molecule is subjected to molecular docking studies with two different proteins, namely Staphylococcus aureus Tyrosyl-tRNA synthetase (PDB ID: 1JIL) and human dihydroorotate dehydrogenase (hDHODH) (PDB ID: 6CJF). The results of molecular docking analysis support the antibacterial activity and demonstrate a strong interaction with the DHODH inhibitor.
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9
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Yabalak E, Dal H, Arslan H. The molecular structure and vibrational spectra of 4-bromo-2-(((5-methylpyridin-2-yl)imino)methyl)phenol by density functional method. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.10.079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Şen B, Sevincek R, Beksultanova N, Dogan Ö. Synthesis, structural characterization, DFT calculations and Hirshfeld surface analysis of (R)-2-((S)-2((S)-hydroxy(ferrocenyl)methyl)aziridin-1yl)butan-1-ol. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.06.085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Moreno-Fuquen R, Cuenú F, Torres JE, De la Vega G, Galarza E, Abonia R, Kennedy AR. Presence of π…π and C H…π interactions in the new Schiff base 2-{( E )-[(3- tert -butyl-1-phenyl-1 H -pyrazol-5-yl)imino]methyl}phenol: Experimental and DFT computational studies. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.08.093] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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12
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Saturated Resin Ectopic Regeneration by Non-Thermal Dielectric Barrier Discharge Plasma. Catalysts 2017. [DOI: 10.3390/catal7120362] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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13
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Venkatesh G, Govindaraju M, Kamal C, Vennila P, Kaya S. Structural, electronic and optical properties of 2,5-dichloro-p-xylene: experimental and theoretical calculations using DFT method. RSC Adv 2017. [DOI: 10.1039/c6ra25535c] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The vibrational spectra including FT-IR and FT-Raman for 2,5-dichloro-p-xylene (DCPX) have been recorded.
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Affiliation(s)
- G. Venkatesh
- R&D Centre
- Bharathiar University
- Coimbatore-641 046
- India
| | - M. Govindaraju
- Department of Chemistry
- Arignar Anna Government Arts College
- Namakkal-638 052
- India
| | - C. Kamal
- Department of Chemistry
- VSA Group of Institutions
- Salem
- India
| | - P. Vennila
- Department of Chemistry
- Thiruvalluvar Government Arts College
- Rasipuram-638 052
- India
| | - S. Kaya
- Department of Chemistry
- Cumhuriyet University
- Sivas-58140
- Turkey
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14
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Yilmaz M, Aydin B, Dogan O, Dereli O. Molecular structure and spectral investigations of 3,5-Di-tert-butyl-o-benzoquinone. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.08.067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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15
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Madanagopal A, Periandy S, Gayathri P, Ramalingam S, Xavier S. Molecular structure activity on pharmaceutical applications of Phenacetin using spectroscopic investigation. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.08.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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16
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Saravanan S, Sankar A, Parimala K. Spectroscopic investigations of 2,5-Difluoronitrobenzene using Hartree-Fock (HF) and density functional theory (DFT) calculations. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.03.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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17
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Alver Ö, Dikmen G. Structure analysis and spectroscopic characterization of 2-Fluoro-3-Methylpyridine-5-Boronic Acid with experimental (FT-IR, Raman, NMR and XRD) techniques and quantum chemical calculations. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.11.041] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Senthil Raj P, Shoba D, Ramalingam S, Periandy S. Spectroscopic (FT-IR/FT-Raman) and computational (HF/DFT) investigation and HOMO/LUMO/MEP analysis on 1,1-difluoro-2-vinyl-cyclopropane. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 147:293-302. [PMID: 25854609 DOI: 10.1016/j.saa.2015.03.084] [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: 06/14/2014] [Revised: 03/07/2015] [Accepted: 03/10/2015] [Indexed: 06/04/2023]
Abstract
All the computational calculations were made in the ground state using the HF and DFT (B3LYP) methods with 6-31++G (d,p) and 6-311++G (d,p) basis sets. Making use of the recorded data, the complete vibrational assignments were made and analysis of the observed fundamental bands of molecule was carried out. The shifting of the frequencies in the vibrational pattern of the title molecule due to the substitutions; CHCH₂ and F were deeply investigated by the vibrational analysis. Moreover, (13)C NMR and (1)H NMR chemical shifts were calculated by using the gauge independent atomic orbital (GIAO) method with HF/B3LYP methods with 6-311++G (d,p). A study on the electronic properties, such as HOMO and LUMO energies, were performed by time-dependent DFT (TD-DFT) approach. Mulliken charges of the 1DF2VCP were also calculated and interpreted. 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)
| | - D Shoba
- Periyar Maniammai University, Thanjavur, India
| | - S Ramalingam
- Department of Physics, A.V.C. College, Mayiladuthurai, Tamilnadu, India
| | - S Periandy
- Department of Physics, Tagore Arts College, Puducherry, India
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Chandrasekaran K, Thilak Kumar R. Structural, spectral, thermodynamical, NLO, HOMO, LUMO and NBO analysis of fluconazole. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 150:974-991. [PMID: 26123515 DOI: 10.1016/j.saa.2015.06.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2014] [Revised: 11/26/2014] [Accepted: 06/01/2015] [Indexed: 06/04/2023]
Abstract
Fluconazole is an efficient antifungal drug used in the treatment and prevention of superficial and systemic fungal infections. The molecular structure, fundamental vibrational wavenumber and intensity of the vibrational bands are interpreted, aided by density functional theory method. The results of the calculations were applied to simulated spectra of the title compound, which show excellent agreement with observed spectra. The vibrational analysis of the title compound has been carried out using FT-IR and FT-Raman spectra. Stability of the molecule arising from hyperconjugative interactions and charge delocalization has been analyzed using natural bond orbital analysis. The present investigation is extended to calculate the HOMO-LUMO energy gap, polarizability, Mulliken charges and thermodynamical properties of fluconazole at different temperature. The calculated HOMO-LUMO energy gap shows that the charge transfer occurs within the molecule. The frontier orbital and molecular electrostatic potential surface studies have been employed to understand the active sites of fluconazole. Nonlinear optical properties related to polarizability and hyperpolarizability are also discussed. The absorption characteristics and solvent analysis of fluconazole have been made using UV-Vis spectroscopic method.
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Affiliation(s)
- K Chandrasekaran
- Department of Physics, Periyar University, Salem 636011, Tamil Nadu, India.
| | - R Thilak Kumar
- Department of Physics, Periyar Arts College, Cuddalore 607001, Tamil Nadu, India
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Suresh M, Padusha MSA, Bharanidharan S, Saleem H, Dhandapani A, Manivarman S. Synthesis, spectral characterization and density functional theory exploration of 1-(quinolin-3-yl)piperidin-2-ol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 144:243-257. [PMID: 25769121 DOI: 10.1016/j.saa.2015.02.018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 12/08/2014] [Accepted: 02/04/2015] [Indexed: 06/04/2023]
Abstract
The experimental and theoretical vibrational frequencies of a newly synthesized compound, namely 1-(quinolin-3-yl)piperidin-2-ol (QPPO) are analyzed. The experimental FT-IR (4000-400 cm(-1)) and FT-Raman (4000-100 cm(-1)) of the molecule in solid phase have been recorded. The optimized molecular structure, vibrational assignments of QPPO have been investigated experimentally and theoretically using Gaussian03W software package. The stability of the molecule arising from hyper-conjugative interaction and charge delocalization has been analyzed using NBO analysis. The first order hyperpolarizability (β0) is calculated to find its character in non-linear optics. Gauge including atomic orbital (GIAO) method is used to calculate (1)H NMR chemical shift calculations were carried out and compared with experimental data. The electronic properties like UV-Visible spectral analysis and HOMO-LUMO energies were reported. The energy gap shows that the charge transfer occurs within the molecule. Thermodynamic parameters of the title compound were calculated at various temperatures.
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Affiliation(s)
- M Suresh
- PG and Research Department of Chemistry, Jamal Mohamed College (Autonomous), Affiliated to Bharthidasan University, Trichy, Tamil Nadu 620 020, India
| | - M Syed Ali Padusha
- PG and Research Department of Chemistry, Jamal Mohamed College (Autonomous), Affiliated to Bharthidasan University, Trichy, Tamil Nadu 620 020, India.
| | - S Bharanidharan
- Department of Physics, Annamalai University, Annamalai Nagar, Tamil Nadu 608 002, India
| | - H Saleem
- Department of Physics, Annamalai University, Annamalai Nagar, Tamil Nadu 608 002, India
| | - A Dhandapani
- PG and Research Department of Chemistry, Government Arts College, C-Mutlur, Chidambaram, Tamil Nadu 608 102, India
| | - S Manivarman
- PG and Research Department of Chemistry, Government Arts College, C-Mutlur, Chidambaram, Tamil Nadu 608 102, India
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Jeyavijayan S. Molecular structure, spectroscopic (FTIR, FT-Raman, 13C and 1H NMR, UV), polarizability and first-order hyperpolarizability, HOMO-LUMO analysis of 2,4-difluoroacetophenone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 136 Pt B:553-566. [PMID: 25448956 DOI: 10.1016/j.saa.2014.09.069] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/11/2014] [Accepted: 09/18/2014] [Indexed: 06/04/2023]
Abstract
The FTIR and FT-Raman spectra of 2,4-difluoroacetophenone (DFAP) have been recorded in the regions 4000-400 cm(-1) and 3500-50 cm(-1), respectively. Utilizing the observed FTIR and FT-Raman data, a complete vibrational assignment and analysis of the fundamental modes of the compound were carried out. The optimum molecular geometry, harmonic vibrational frequencies, infrared intensities and Raman scattering activities, were calculated by density functional theory (DFT/B3LYP) method with 6-31+G(d,p) and 6-311++G(d,p) basis sets. The difference between the observed and scaled wavenumber values of most of the fundamentals is very small. A detailed interpretation of the infrared and Raman spectra of DFAP is also reported based on total energy distribution (TED). Stability of the molecule arising from hyperconjugative interactions, charge delocalization have been analyzed using natural bond orbital (NBO) analysis. The MEP map shows the negative potential sites are on oxygen atom as well as the positive potential sites are around the hydrogen atoms. The UV-Vis spectral analysis of DFAP has also been done which confirms the charge transfer of DFAP. The chemical shifts of H atoms and C atoms were calculated using NMR analysis. Furthermore, the polarizability, the first hyperpolarizability and total dipole moment of the molecule have been calculated.
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Affiliation(s)
- S Jeyavijayan
- Department of Physics, J.J. College of Engineering and Technology, Tiruchirappalli 620 009, India.
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22
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Sert Y, Balakit AA, Öztürk N, Ucun F, El-Hiti GA. Experimental (FT-IR, NMR and UV) and theoretical (M06-2X and DFT) investigation, and frequency estimation analyses on (E)-3-(4-bromo-5-methylthiophen-2-yl)acrylonitrile. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 131:502-511. [PMID: 24840492 DOI: 10.1016/j.saa.2014.04.105] [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: 01/23/2014] [Revised: 04/16/2014] [Accepted: 04/22/2014] [Indexed: 06/03/2023]
Abstract
The spectroscopic properties of (E)-3-(4-bromo-5-methylthiophen-2-yl)acrylonitrile have been investigated by FT-IR, UV, (1)H and (13)C NMR techniques. The theoretical vibrational frequencies and optimized geometric parameters (bond lengths and angles) have been calculated using density functional theory (DFT/B3LYP: Becke, 3-parameter, Lee-Yang-Parr) and DFT/M06-2X (the highly parameterized, empirical exchange correlation function) quantum chemical methods with 6-311++G(d,p) basis set by Gaussian 03 software, for the first time. The assignments of the vibrational frequencies have been carried out by potential energy distribution (PED) analysis by using VEDA 4 software. The theoretical optimized geometric parameters and vibrational frequencies were in good agreement with the corresponding experimental data, and with the results in the literature. (1)H and (13)C NMR chemical shifts were calculated by using the gauge-invariant atomic orbital (GIAO) method. The electronic properties, such as excitation energies, oscillator strength wavelengths were performed by B3LYP methods. In addition, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energies and the other related molecular energy values have been calculated and depicted.
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Affiliation(s)
- Yusuf Sert
- Department of Physics, Faculty of Art & Sciences, Bozok University, Yozgat 66100, Turkey; Sorgun Vocational School, Bozok University, Yozgat 66100, Turkey.
| | - Asim A Balakit
- Department of Chemistry, College of Science for Women, University of Babylon, Babylon, Iraq; College of Pharmacy, Babylon University, Iraq
| | - Nuri Öztürk
- Department of Physics, Faculty of Art & Sciences, Süleyman Demirel University, Isparta 32100, Turkey
| | - Fatih Ucun
- Department of Physics, Faculty of Art & Sciences, Süleyman Demirel University, Isparta 32100, Turkey
| | - Gamal A El-Hiti
- Department of Optometry, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433, Saudi Arabia
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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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24
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Sert Y, Doğan H, Navarrete A, Somanathan R, Aguirre G, Çırak Ç. Experimental FT-IR, Laser-Raman and DFT spectroscopic analysis of 2,3,4,5,6-Pentafluoro-trans-cinnamic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 128:119-126. [PMID: 24662760 DOI: 10.1016/j.saa.2014.02.122] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 02/04/2014] [Accepted: 02/19/2014] [Indexed: 06/03/2023]
Abstract
In this study, the experimental and theoretical vibrational frequencies of a newly synthesized 2,3,4,5,6-Pentafluoro-trans-cinnamic acid have been investigated. The experimental FT-IR (4000-400 cm(-1)) and Laser-Raman spectra (4000-100 cm(-1)) of the molecule in solid phase have been recorded. The theoretical vibrational frequencies and optimized geometric parameters (bond lengths and bond angles) have been calculated by using density functional theory (DFT/B3LYP: Becke, 3-parameter, Lee-Yang-Parr) and DFT/M06-2X (the highly parameterized, empirical exchange correlation function) quantum chemical methods with 6-311++G(d,p) basis set by Gaussian 09W software, for the first time. The assignments of the vibrational frequencies have been done by potential energy distribution (PED) analysis by using VEDA 4 software. The theoretical optimized geometric parameters and vibrational frequencies have been found to be in good agreement with the corresponding experimental data, and with the results in the literature. In addition, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energies and the other related molecular energy values have been calculated and depicted.
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Affiliation(s)
- Yusuf Sert
- Department of Physics, Faculty of Art & Sciences, Bozok University, Yozgat 66100, Turkey; Sorgun Vocational School, Bozok University, Yozgat 66100, Turkey.
| | - Hatice Doğan
- Department of Physics, Faculty of Art & Sciences, Bozok University, Yozgat 66100, Turkey
| | - Angélica Navarrete
- Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana, Apdo. Postal 1166, 22500 Tijuana, B.C., Mexico
| | - Ratnasamy Somanathan
- Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana, Apdo. Postal 1166, 22500 Tijuana, B.C., Mexico
| | - Gerardo Aguirre
- Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana, Apdo. Postal 1166, 22500 Tijuana, B.C., Mexico
| | - Çağrı Çırak
- Department of Physics, Faculty of Art & Sciences, Erzincan University, Erzincan 24100, Turkey
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25
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Sert Y, Singer LM, Findlater M, Doğan H, Çırak Ç. Vibrational frequency analysis, FT-IR, DFT and M06-2X studies on tert-Butyl N-(thiophen-2yl)carbamate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 128:46-53. [PMID: 24657467 DOI: 10.1016/j.saa.2014.02.114] [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: 01/04/2014] [Revised: 01/31/2014] [Accepted: 02/19/2014] [Indexed: 06/03/2023]
Abstract
In this study, the experimental and theoretical vibrational frequencies of a newly synthesized tert-Butyl N-(thiophen-2yl)carbamate have been investigated. The experimental FT-IR (4000-400 cm(-1)) spectrum of the molecule in the solid phase have been recorded. The theoretical vibrational frequencies and optimized geometric parameters (bond lengths and bond angles) have been calculated by using density functional theory (DFT/B3LYP: Becke, 3-parameter, Lee-Yang-Parr) and DFT/M06-2X (the highly parametrized, empirical exchange correlation function) quantum chemical methods with the 6-311++G(d,p) basis set by Gaussian 09W software, for the first time. The vibrational frequencies have been assigned using potential energy distribution (PED) analysis by using VEDA 4 software. The computational optimized geometric parameters and vibrational frequencies have been found to be in good agreement with the corresponding experimental data, and with related literature results. In addition, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energies and the other related molecular energy values have been calculated and are depicted.
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Affiliation(s)
- Yusuf Sert
- Department of Physics, Faculty of Art & Sciences, Bozok University, Yozgat 66100, Turkey; Sorgun Vocational School, Bozok University, Yozgat 66100, Turkey.
| | - L M Singer
- Department of Chemistry & Biochemistry, Texas Tech University, Memorial Circle & Boston, Lubbock, TX 79409, USA
| | - M Findlater
- Department of Chemistry & Biochemistry, Texas Tech University, Memorial Circle & Boston, Lubbock, TX 79409, USA
| | - Hatice Doğan
- Department of Physics, Faculty of Art & Sciences, Bozok University, Yozgat 66100, Turkey
| | - Ç Çırak
- Department of Physics, Faculty of Art & Sciences, Erzincan University, Erzincan 24100, Turkey
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26
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Balachandran V, Janaki A, Nataraj A. Theoretical investigations on molecular structure, vibrational spectra, HOMO, LUMO, NBO analysis and hyperpolarizability calculations of thiophene-2-carbohydrazide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 118:321-330. [PMID: 24060478 DOI: 10.1016/j.saa.2013.08.091] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 08/20/2013] [Accepted: 08/23/2013] [Indexed: 06/02/2023]
Abstract
The Fourier-Transform infrared and Fourier-Transform Raman spectra of thiophene-2-carbohydrazide (TCH) was recorded in the region 4000-400 cm(-1) and 3500-100 cm(-1). Quantum chemical calculations of energies, geometrical structure and vibrational wavenumbers of TCH were carried out by DFT (B3LYP) method with 6-311++G(d,p) as basis set. The difference between the observed and scaled wavenumber values of most of the fundamentals is very small. Stability of the molecule arising from hyper conjugative interaction and charge delocalization has been analyzed using natural bond orbital (NBO) analysis. UV spectrum was measured in different solvent. The energy and oscillator strength are calculated by Time Dependant Density Functional Theory (TD-DFT) results. The calculated HOMO and LUMO energies also confirm that charge transfer occurs within the molecule. The complete assignments were performed on the basis of the potential energy distribution (PED) of vibrational modes, calculated with scaled quantum mechanics (SQM) method. Finally the theoretical FT-IR, FT-Raman, and UV spectra of the title molecule have also been constructed.
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Affiliation(s)
- V Balachandran
- Department of Physics, A.A. Govt. Arts College, Musiri, Tiruchirapalli 621201, India.
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27
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Monomeric and dimeric structures analysis and spectroscopic characterization of 3,5-difluorophenylboronic acid with experimental (FT-IR, FT-Raman, 1H and 13C NMR, UV) techniques and quantum chemical calculations. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2013.10.064] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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28
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Karthick T, Balachandran V, Perumal S, Lakshmi A. Rotational isomers, spectroscopic (FT-IR, FT-Raman) studies and quantum chemical calculations on 2,4,6-tris(dimethylaminomethyl) phenol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 113:52-66. [PMID: 23714184 DOI: 10.1016/j.saa.2013.04.095] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 04/13/2013] [Accepted: 04/24/2013] [Indexed: 06/02/2023]
Abstract
In this work, the spectroscopic characterization of 2,4,6-tris(dimethylaminomethyl) phenol; a novel promoter factor for DNA has been studied primarily. The FT-IR (4000-400 cm(-1)) and FT-Raman (3500-100 cm(-1)) spectra have been recorded on the solid phase of the title molecule. The spectroscopic signature of the title molecule has been found by comparing experimental FT-IR, FT-Raman spectra with the theoretical IR and Raman spectra of the stable isomer geometry at density functional theory (DFT) method with 6-311++G(d,p) basis set. Further, the vibrational assignments were performed on the basis of potential energy distribution (PED). The natural atomic orbital and natural population analysis performed in this study ensures us to know about the delocalization of charge and electron density of atoms within the molecule. Analysis of natural bond orbitals (NBOs) and HOMO-LUMO energy gap of the compound provides information about its chemical stability and intramolecular charge transfer properties. In addition, the reacting electrophilic and nucleophilic sites of the molecule were predicted with the help of molecular electrostatic potential (MEP) surface analysis. Moreover, the intensity of molecular vibrations at different temperatures were examined by applying thermo-chemical analysis. To investigate the solvent effect, the polarizable continuum model was used and the allowed transitions between various HOMO and LUMO levels were found.
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Affiliation(s)
- T Karthick
- Department of Physics, Vivekanandha College for Women, Tiruchengode 637 205, India
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29
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Yabalak E, Günay F, Kasumov VT, Arslan H. The molecular structure and vibrational spectra of N-(3-tert-butyl-2-hydroxybenzylidene)-2,6-diphenyl-4-hydroxyaniline. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 110:291-303. [PMID: 23583846 DOI: 10.1016/j.saa.2013.03.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Revised: 02/18/2013] [Accepted: 03/03/2013] [Indexed: 06/02/2023]
Abstract
The molecular structure, vibrational frequencies and intensities of N-(3-tert-butyl-2-hydroxybenzylidene)-2,6-diphenyl-4-hydroxyaniline were calculated by the Density Functional Theory methods (BLYP, B3PW91 and B3LYP) using the 6-31G(d,p) basis set. The calculated geometric parameters were compared to the corresponding X-ray structure of the title compound. The comparison of the theoretical and experimental geometry of the title compound shows that the X-ray parameters fairly well reproduce the geometry of optimized by B3LYP method (r=0.9825). The harmonic vibrations computed for this compound by the B3LYP/6-31G(d,p) method are in good agreement with the observed IR and Raman spectral data. The root mean square values error of the observed and calculated IR bands are found to be 9.80, 9.40 and 8.42 for B3LYP, B3PW91 and BLYP/6-31G(d,p) methods, respectively. Theoretical vibrational spectra of the title compound were interpreted by means of PEDs using the SQM 2.0 program. A general better performance of the investigated methods was calculated by PAVF 1.0 program.
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Affiliation(s)
- Erdal Yabalak
- Mersin University, Faculty of Arts and Science, Department of Chemistry, Mersin TR-33343, Turkey
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30
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Arivazhagan M, Muniappan P, Meenakshi R, Rajavel G. PCM/TD-DFT analysis of 1-bromo-2,3-dichlorobenzene--a combined study of experimental (FT-IR and FT-Raman) and theoretical calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 105:497-508. [PMID: 23352918 DOI: 10.1016/j.saa.2012.11.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Revised: 11/03/2012] [Accepted: 11/06/2012] [Indexed: 06/01/2023]
Abstract
This study represents an integral approach towards understanding the electronic and structural aspects of 1-bromo-2,3-dichlorobenzene (BDCB). The experimental spectral bands were structurally assigned with the theoretical calculation, and the thermodynamic properties of the studied compound were obtained from the theoretically calculated frequencies. The relationship between the structure and absorption spectrum and effects of solvents have been discussed. It turns that the hybrid PBE1PBE functional with 6-311+G(d,p) basis provide reliable λ(max) when solvent effects are included in the model. The NBO analysis reveals that the studied compound presents a structural characteristic of electron-transfer within the compound. The frontier molecular orbitals (HOMO-LUMO) are responsible for the electron polarization and electron-transfer properties. The reactivity sites are identified by mapping the electron density into electrostatic potential surface (MESP). Besides, (13)C and (1)H have been calculated using the gauge-invariant atomic orbital (GIAO) method. The thermodynamic properties at different temperatures were calculated, revealing the correlations between standard heat capacity, standard entropy, standard enthalpy changes and temperatures. Furthermore, the studied compound can be used as a good nonlinear optical material due to the higher value of first hyper polarizability (5.7 times greater than that of urea (0.37289×10(-30) esu)). Finally, it is worth to mentioning that solvent induces a considerable red shift of the absorption maximum going from the gas phase, and a slight blue shift of the transition S(0)→S(1) going from less polar to more polar solvents.
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Affiliation(s)
- M Arivazhagan
- Department of Physics, A.A. Govt. Arts College, Musiri 621 201, Tamil Nadu, India.
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31
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Viana RB, Santos EDA, Valencia LJ, Cavalcante RM, Costa EB, Moreno-Fuquen R, da Silva ABF. 4-hydroxy-2,5-dimethylphenyl-benzophenone: conformational stability, FT-IR and Raman investigation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 102:386-392. [PMID: 23220682 DOI: 10.1016/j.saa.2012.09.094] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Revised: 06/30/2012] [Accepted: 09/14/2012] [Indexed: 06/01/2023]
Abstract
In this paper we have studied the 4-hydroxyl-2,5 dimethylphenyl-benzophenone. Also, it was analyzed the vibrational assignment (FT-IR and Raman) in conjunction with computational results. The conformational analysis showed three barrier heights where two are due to the dihedral rotation and the other one is attributed to hydroxyl rotation. While the high dihedral rotational barrier (TS1) is 6.06-7.22 kcal mol(-1), the lower one (TS2) is almost three times smaller. The variations with the change of basis set is 5-8% to TS1, and 3-15% in the values predicted to TS2. In the case of OH rotational barrier, the values range from 3.70 to 4.86 kcal mol(-1), and it is also observed that this transition state is less sensitive to the change of basis set and to the method. Two isomers was detected due to the changes in the OH rotation with the gap energy lower than 0.7 kcal mol(-1), and at this point is seen that semi-empirical methods fail into describe the most stable conformation which may be due to the small energy gap. The enthalpy formation at 0 K and 298 K was 111.71 and 102.20 kcal mol(-1), respectively.
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Affiliation(s)
- Rommel B Viana
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil.
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32
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Karabacak M, Kose E, Atac A, Ali Cipiloglu M, Kurt M. Molecular structure investigation and spectroscopic studies on 2,3-difluorophenylboronic acid: a combined experimental and theoretical analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 97:892-908. [PMID: 22902933 DOI: 10.1016/j.saa.2012.07.077] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2012] [Revised: 07/06/2012] [Accepted: 07/22/2012] [Indexed: 06/01/2023]
Abstract
This work presents the characterization of 2,3-difluorophenylboronic acid (abbreviated as 2,3-DFPBA, C(6)H(3)B(OH)(2)F(2)) by quantum chemical calculations and spectral techniques. The spectroscopic properties were investigated by FT-IR, FT-Raman UV-Vis, (1)H and (13)C nuclear magnetic resonance (NMR) techniques. The FT-IR spectrum (4000-400 cm(-1)) and the FT-Raman spectrum (3500-10 cm(-1)) in the solid phase were recorded for 2,3-DFPBA. The (1)H and (13)C NMR spectra were recorded in DMSO solution. The UV-Vis absorption spectra of the 2,3-DFPBA that dissolved in water and ethanol were recorded in the range of 200-400 nm. There are four possible conformers for this molecule. The computational results diagnose the most stable conformer of the 2,3-DFPBA as the trans-cis form. The structural and spectroscopic data of the molecule were obtained for all four conformers from DFT (B3LYP) with 6-311++G (d,p) basis set calculations. The theoretical wavenumbers were scaled and compared with experimental FT-IR and FT-Raman spectra. The complete assignments were performed on the basis of the experimental results and total energy distribution (TED) of the vibrational modes, calculated with scaled quantum mechanics (SQM) method, interpreted in terms of fundamental modes. We obtained good consistency between experimental and theoretical spectra. (13)C and (1)H NMR chemical shifts of the molecule were calculated by using the gauge-invariant atomic orbital (GIAO) method. The electronic properties, such as excitation energies, absorption wavelengths, HOMO and LUMO energies, were performed by time-dependent DFT (TD-DFT) approach. Finally the calculation results were analyzed to simulate infrared, Raman, NMR and UV spectra of the 2,3-DFPBA which show good agreement with observed spectra.
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Affiliation(s)
- Mehmet Karabacak
- Department of Physics, Afyon Kocatepe University, Afyonkarahisar, Turkey
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33
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Ramalingam S, Karabacak M, Periandy S, Puviarasan N. Spectroscopic analysis (FT-IR/FT-Raman) and molecular structure investigation on m-fluoronitrobenzene using hybrid computational calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 94:318-330. [PMID: 22534557 DOI: 10.1016/j.saa.2012.03.042] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 03/04/2012] [Accepted: 03/10/2012] [Indexed: 05/31/2023]
Abstract
In the present investigation, the FT-IR/FT-Raman spectra of the m-fluoronitrobenzene (m-FNBZ) are recorded. The fundamental frequencies are assigned and the computational calculations are performed by DFT (B3LYP, B3PW91 and MPW1PW91) methods with 6-31++G(d,p) and 6-311++G(d,p) basis sets and the corresponding results are tabulated. The computed values of frequencies are scaled by using suitable factors. The distortion of the structure of the compound due to the substitutions of Fl and NO(2) is investigated. The alternation of the vibrational pattern of the pedestal molecule related to the substitutions is analyzed. A study on the electronic properties; absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies, are performed by time dependent DFT (TD-DFT) approach. The electronic structure and the assignment of the absorption bands in the electronic spectra of steady compounds are discussed. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. Besides frontier molecular orbitals (FMO), molecular electrostatic potential (MEP) was performed. Mulliken charges of the m-FNBZ molecule was also calculated and interpreted. 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 Ramalingam
- Department of Physics, A.V.C. College, Mayiladuthurai, Tamilnadu, India.
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34
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Tang S, Lu N, Li J, Wu Y. Design and application of an up-scaled dielectric barrier discharge plasma reactor for regeneration of phenol-saturated granular activated carbon. Sep Purif Technol 2012. [DOI: 10.1016/j.seppur.2012.05.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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35
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Density Functional Theory Study on the Identification of Pd(Me-Xanthate)2. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2012. [DOI: 10.1007/s13369-012-0251-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Dereli Ö, Erdogdu Y, Gulluoglu M. Study on molecular structure and vibrational spectra of (triphenylphosphoranylidene) acetaldehyde using DFT: A combined experimental and quantum chemical approach. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2011.12.040] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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37
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Dereli Ö, Erdogdu Y, Gulluoglu M, Türkkan E, Özmen A, Sundaraganesan N. Vibrational spectral and quantum chemical investigations of tert-butyl-hydroquinone. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.01.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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38
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Wu X, Gao S, Wang JS, Wang H, Huang YW, Zhao Y. The surface-enhanced Raman spectra of aflatoxins: spectral analysis, density functional theory calculation, detection and differentiation. Analyst 2012; 137:4226-34. [DOI: 10.1039/c2an35378d] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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Kalaichelvan S, Sundaraganesan N, Dereli O, Sayin U. Experimental, theoretical calculations of the vibrational spectra and conformational analysis of 2,4-di-tert-butylphenol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 85:198-209. [PMID: 22020168 DOI: 10.1016/j.saa.2011.09.061] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2011] [Revised: 09/26/2011] [Accepted: 09/29/2011] [Indexed: 05/31/2023]
Abstract
In the present work, we reported a combined experimental and theoretical study on conformational stability, molecular structure and vibrational spectra of 2,4-di-tert-butylphenol (2,4-DTBP). The FT-IR (400-4000cm(-1)) and FT-Raman spectra (50-3500cm(-1)) of 2,4-DTBP were recorded. The molecular geometry, harmonic vibrational frequencies and bonding features of 2,4-DTBP in the ground-state have been calculated by using the density functional BLYP/B3LYP methods. The energy calculated by time-dependent density functional theory (TD-DFT) result complements with the experimental findings. The calculated highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energies show that charge transfer occurs within the molecule. Finally the calculation results were compared with measured infrared and Raman spectra of the title compound which showed good agreement with observed spectra.
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Affiliation(s)
- S Kalaichelvan
- Department of Physics, A.A. Govt. Arts College, Namakkal 637001, Tamil Nadu, India
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40
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Udayakumar V, Periandy S, Karabacak M, Ramalingam S. Experimental (FT-IR, FT-Raman) and theoretical (HF and DFT) investigation and HOMO and LUMO analysis on the structure of p-fluoronitrobenzene. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 83:575-586. [PMID: 21955946 DOI: 10.1016/j.saa.2011.09.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 08/19/2011] [Accepted: 09/01/2011] [Indexed: 05/31/2023]
Abstract
FT-IR and FT-Raman spectra of p-fluoronitrobenzene (FNO(2)C(6)H(4)) have been recorded in the region 4000-100 cm(-1). In this work, the experimental and theoretical spectra of p-fluoronitrobenzene (p-FNBz) are studied. The molecular geometry and vibrational frequencies are calculated in the ground state of molecule using ab initio Hartree-Fock (HF) and DFT (B3LYP and LSDA) methods with 6-31++G(d,p) and 6-311++G(d,p) basis sets. The computed values of frequencies are scaled to yield good coherence with observed values by using suitable factor. The complete assignments are performed on the basis of the total energy distribution (TED) of the vibrational modes, calculated with scaled quantum mechanics (SQM) method. The observed and calculated frequencies are found to be in very good agreement. The alteration of vibration bands due to the substitutions at the first and fourth position of the skeletal ring is also investigated from their characteristic region of linked spectrum. A study on the electronic properties, such as absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies, are performed by time dependent DFT (TD-DFT) approach. The electronic structure and the assignment of the absorption bands in the electronic spectra of steady compounds are discussed. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. The thermodynamic properties of the title compound at different temperatures have been calculated in gas phase, revealing the correlations between standard heat capacities (C) standard entropies (S), standard enthalpy changes (H) and temperatures.
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Affiliation(s)
- V Udayakumar
- Department of Physics, Thiru A. Govindaswamy Arts College, Tindivanam, Tamilnadu, India
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Subramanian N, Sundaraganesan N, Dereli O, Türkkan E. FT-IR, FT-Raman spectra, density functional computations of the vibrational spectra and molecular conformational analysis of 2,5-di-tert-butyl-hydroquinone. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 83:165-174. [PMID: 21903454 DOI: 10.1016/j.saa.2011.08.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2011] [Revised: 08/04/2011] [Accepted: 08/10/2011] [Indexed: 05/31/2023]
Abstract
The purpose of finding conformer among six different possible conformers of 2,5-di-tert-butyl-hydroquinone (DTBHQ), its equilibrium geometry and harmonic wavenumbers were calculated by the B3LYP/6-31G(d,p) method. The infrared and Raman spectra of DTBHQ were recorded in the region 400-4000 cm(-1) and 50-3500 cm(-1), respectively. In addition, the IR spectra in CCl(4) at various concentrations of DTBHQ are also recorded. The computed vibrational wavenumbers were compared with the IR and Raman experimental data. Computational calculations at B3LYP level with two different basis sets 6-31G(d,p) and 6-311++G(d,p) are also employed in the study of the possible conformer of DTBHQ. The complete assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes, calculated using VEDA 4 program. The general agreement between the observed and calculated frequencies was established.
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Affiliation(s)
- N Subramanian
- Government College of Education, Komarapalayam, Tamil Nadu, India
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Mahadevan D, Periandy S, Karabacak M, Ramalingam S. FT-IR and FT-Raman, UV spectroscopic investigation of 1-bromo-3-fluorobenzene using DFT (B3LYP, B3PW91 and MPW91PW91) calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 82:481-492. [PMID: 21840753 DOI: 10.1016/j.saa.2011.07.082] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Revised: 07/14/2011] [Accepted: 07/24/2011] [Indexed: 05/31/2023]
Abstract
The FT-IR and FT-Raman spectra of 1-bromo-3-fluorobenzene (C(6)H(4)FBr) molecule have been recorded using Bruker IFS 66V spectrometer in the range of 4000-100 cm(-1). The molecular geometry and vibrational frequencies in the ground state are calculated using the DFT (B3LYP, B3PW91 and MPW91PW91) methods with 6-31++G(d,p) and 6-311++G(d,p) basis sets. The computed values of frequencies are scaled using a suitable scale factor to yield good coherence with the observed values. The isotropic DFT (B3LYP, B3PW91 and MPW1PW91) analysis showed good agreement with the experimental observations. Comparison of the fundamental vibrational frequencies with calculated results by B3LYP methods. The complete data of this molecule provide the information for future development of substituted benzene. The influence of bromine and fluorine atom on the geometry of benzene and its normal modes of vibrations has also been discussed. A study on the electronic properties, such as absorption wavelengths, excitation energy, dipole moment and frontier molecular orbital energies, was performed by time dependent DFT (TD-DFT) approach. The electronic structure and the assignment of the absorption bands in the electronic spectra of steady compounds were discussed. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. On the basis of the thermodynamic properties of the title compound at different temperatures have been calculated in gas phase, revealing the correlations between standard heat capacities (C) standard entropies (S), standard enthalpy changes (H) and temperatures.
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Affiliation(s)
- D Mahadevan
- Department of Physics, E.S. College of Engineering & Technology,Villupuram, India
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Mahadevan D, Periandy S, Ramalingam S. FT-IR and FT-Raman, vibrational assignments, molecular geometry, ab initio (HF) and DFT (B3LYP) calculations for 1,3-dichlorobenzene. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:962-969. [PMID: 21561799 DOI: 10.1016/j.saa.2011.04.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 03/23/2011] [Accepted: 04/04/2011] [Indexed: 05/30/2023]
Abstract
The FT-IR and FT-Raman vibrational spectra of 1,3-dichlorobenzene (1,3-DCB) have been recorded using Bruker IFS 66 V Spectrometer in the range 4000-100 cm(-1). A detailed vibrational spectral analysis has been carried out and assignments of the observed fundamental bands have been proposed on the basis of peak positions and relative intensities. The optimized molecular geometry, vibrational frequencies, atomic charges, dipole moment, rotational constants and several thermodynamic parameters in the ground state were calculated using ab initio Hartree-Fock (HF) and DFT (B3LYP) methods with 6-31++G (d, p) and 6-311++G (d, p) basis sets. With the help of different scaling factors, the observed vibrational wave numbers in FT-IR and FT-Raman spectra were analyzed and assigned to different normal modes of the molecule. Most of the modes have wave numbers in the expected range. The inductive effect of Chlorine atoms in the benzene molecule has also been investigated.
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Affiliation(s)
- D Mahadevan
- Department of Physics, Govt. Arts College, Tindivanam, Tamilnadu, India.
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Babu PC, Sundaraganesan N, Dereli Ö, Türkkan E. FT-IR, FT-Raman spectra, density functional computations of the vibrational spectra and molecular geometry of butylated hydroxy toluene. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:562-569. [PMID: 21501967 DOI: 10.1016/j.saa.2011.03.034] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2010] [Revised: 02/26/2011] [Accepted: 03/11/2011] [Indexed: 05/30/2023]
Abstract
The FT-IR spectrum of 2,6-di-tert-butyl-4-methylphenol [butylated hydroxy toluene] was recorded in the region 4000-400 cm(-1). The FT-Raman spectrum of butylated hydroxy toluene was also recorded in the region 3500-50 cm(-1). The molecular structure and vibrational frequencies of butylated hydroxy toluene (BHT) have been investigated with combined experimental and theoretical study. Two stable conformers of the title compound were obtained from the result of geometry optimizations of these possible conformers. The conformer 1 is (approximately 2.6 kcal/mol) more stable than conformer 2. Geometry optimizations and vibrational frequency calculations were performed by BLYP and B3LYP methods using 6-31G(d), 6-31G(d,p) and 6-31+G(d,p) as basis sets. The scaled frequencies were compared with experimental spectrum and on the basis of this comparison; assignments of fundamental vibrational modes were examined. Comparison of the experimental spectra with harmonic vibrational wavenumbers indicates that B3LYP/6-31G(d) results are more accurate. Predicted electronic absorption spectra of BHT from TD-DFT calculation have been analyzed and compared with the experimental UV-vis spectrum. The calculated HOMO and LUMO energies show that the charge transfer occurs within the molecule.
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Affiliation(s)
- P Chinna Babu
- Department of Physics (Engg.), Annamalai University, Annamalai Nagar, Chidambaram 608002, Tamil Nadu, India
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Dereli Ö, Sudha S, Sundaraganesan N. Molecular structure and vibrational spectra of 4-phenylsemicarbazide by density functional method. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.03.054] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Mahadevan D, Periandy S, Ramalingam S. Vibrational spectroscopy (FTIR and FTRaman) investigation using ab initio (HF) and DFT (B3LYP) calculations on the structure of 3-Bromo phenol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 78:575-581. [PMID: 21185772 DOI: 10.1016/j.saa.2010.11.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Accepted: 11/18/2010] [Indexed: 05/30/2023]
Abstract
The FT-IR and FT-Raman spectra of 3-Bromo phenol (3-BP) molecule have been recorded using Bruker IFS 66V spectrometer in the range of 4000-100 cm(-1). The molecular geometry and vibrational frequencies in the ground state are calculated by using the ab initio Hartree-fock (HF) and DFT (B3LYP) methods with 6-31G (d, p) and 6-311G (d, p) basis sets. The computed values of frequencies are scaled using a suitable scale factor to yield good coherence with the observed values. Making use of the recorded data, the complete vibrational assignments are made and analysis of the observed fundamental bands of molecule is carried out. The geometries and normal modes of vibrations obtained from ab initio HF and B3LYP calculations are in good agreement with the experimentally observed data. The differences between the observed and scaled wave number values of most of the fundamentals are very small in DFT than HF. The inductive effect of halogen atom in the molecule has also been investigated.
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Affiliation(s)
- D Mahadevan
- Department of Physics, Govt Arts College, Tindivanam, India.
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Wang TC, Lu N, Li J, Wu Y. Evaluation of the potential of pentachlorophenol degradation in soil by pulsed corona discharge plasma from soil characteristics. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2010; 44:3105-3110. [PMID: 20218544 DOI: 10.1021/es903527w] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Chlorinated organics are frequently found as harmful soil contaminants and persisted for extended periods of time. A novel approach, named pulsed corona discharge plasma (PCDP), was employed for the degradation of pentachlorophenol (PCP) in soil. Experimental results showed that 87% of PCP could be smoothly removed in 60 min. Increasing pulse voltage, enhancing soil pH, lowering humic acid (HA) in soil and reducing granular size of the soil were found to be favorable for PCP degradation efficiency. Oxidation and physical processes simultaneously contributed to PCP removal in soil and ozone was the main factor in PCDP treatment. C-Cl bonds in PCP were cleaved during PCDP treatment by Fourier transform infrared spectroscopy (FTIR) analysis. The mineralization of PCP was confirmed by total organic carbon (TOC) and dechlorination analyses. The main intermediate products such as tetrachlorocatechol, tetrachlorohydroquinone, acetic acid, formic acid, and oxalic acid were identified by HPLC/MS and ion chromatography. A possible pathway of PCP degradation in soil in such a system was proposed.
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Affiliation(s)
- Tie Cheng Wang
- Institute of Electrostatics and Special Power, Dalian University of Technology, Dalian 116024, PR China
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Karabacak M, Çınar M, Çoruh A, Kurt M. Theoretical investigation on the molecular structure, Infrared, Raman and NMR spectra of para-halogen benzenesulfonamides, 4-X-C6H4SO2NH2 (X=Cl, Br or F). J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2008.08.007] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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