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Söyüt H, Kolcu F, Kaya İ, Yaşar AÖ. Influence of the enzymatic and the chemical oxidative polymerization of trifluoromethyl‐substituted aromatic diamine on thermal and photophysical properties. POLYM ADVAN TECHNOL 2023. [DOI: 10.1002/pat.5970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Hakan Söyüt
- Bursa Uludağ University Faculty of Education, Department of Basic Education Bursa Turkey
- Çanakkale Onsekiz Mart University Department of Chemistry, Polymer Synthesis and Analysis Lab Çanakkale Turkey
| | - Feyza Kolcu
- Çanakkale Onsekiz Mart University Department of Chemistry, Polymer Synthesis and Analysis Lab Çanakkale Turkey
- Lapseki Vocational School, Department of Chemistry and Chemical Processing Technologies Çanakkale Onsekiz Mart University Çanakkale Turkey
| | - İsmet Kaya
- Çanakkale Onsekiz Mart University Department of Chemistry, Polymer Synthesis and Analysis Lab Çanakkale Turkey
| | - Alper Ömer Yaşar
- Çanakkale Onsekiz Mart University Department of Chemistry, Polymer Synthesis and Analysis Lab Çanakkale Turkey
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2
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Kansız S, Azam M, Basılı T, Meral S, Aktaş FA, Yeşilbağ S, Min K, Ağar AA, Dege N. Synthesis, structural studies, Hirshfeld surface analysis, and molecular docking studies of a thiophene-based Schiff base compound. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133477] [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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3
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Priscilla J, Arul Dhas D, Hubert Joe I, Ronaldo Anuf A. Spectroscopic Investigation, DFT Calculations, anti-Inflammatory Activity and Molecular Dynamic Simulation Study on Fagaramide Alkaloid. Polycycl Aromat Compd 2022. [DOI: 10.1080/10406638.2022.2094973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- J. Priscilla
- Department of Physics, Physics Research Centre, Nesamony Memorial Christian College, Marthandam, Kanyakumari District, Tamilnadu, India
| | - D. Arul Dhas
- Department of Physics, Physics Research Centre, Nesamony Memorial Christian College, Marthandam, Kanyakumari District, Tamilnadu, India
| | - I. Hubert Joe
- Centre for Molecular and Biophysics Research, Department of Physics, Mar Ivanios College, Thiruvananthapuram, Kerala, India
| | - A. Ronaldo Anuf
- Department of Biotechnology, Kamaraj College of Engineering and Technology, Virudhunagar, Tamilnadu, India
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Ovung A, Mavani A, Ghosh A, Chatterjee S, Das A, Suresh Kumar G, Ray D, Aswal VK, Bhattacharyya J. Heme Protein Binding of Sulfonamide Compounds: A Correlation Study by Spectroscopic, Calorimetric, and Computational Methods. ACS OMEGA 2022; 7:4932-4944. [PMID: 35187312 PMCID: PMC8851458 DOI: 10.1021/acsomega.1c05554] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 01/24/2022] [Indexed: 05/16/2023]
Abstract
Protein-ligand interaction studies are useful to determine the molecular mechanism of the binding phenomenon, leading to the establishment of the structure-function relationship. Here, we report the binding of well-known antibiotic sulfonamide drugs (sulfamethazine, SMZ; and sulfadiazine, SDZ) with heme protein myoglobin (Mb) using spectroscopic, calorimetric, ζ potential, and computational methods. Formation of a 1:1 complex between the ligand and Mb through well-defined equilibrium was observed. The binding constants obtained between Mb and SMZ/SDZ drugs were on the order of 104 M-1. SMZ with two additional methyl (-CH3) substitutions has higher affinity than SDZ. Upon drug binding, a notable loss in the helicity (via circular dichroism) and perturbation of the three-dimensional (3D) protein structure (via infrared and synchronous fluorescence experiments) were observed. The binding also indicated the dominance of non-polyelectrolytic forces between the amino acid residues of the protein and the drugs. The ligand-protein binding distance signified high probability of energy transfer between them. Destabilization of the protein structure upon binding was evident from differential scanning calorimetry results and ζ potential analyses. Molecular docking presented the best probable binding sites of the drugs inside protein pockets. Thus, the present study explores the potential binding characteristics of two sulfonamide drugs (with different substitutions) with myoglobin, correlating the structural and energetic aspects.
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Affiliation(s)
- Aben Ovung
- Department
of Chemistry, National Institute of Technology
Nagaland, Chumukedima, Dimapur 797103, India
| | - A. Mavani
- Department
of Chemistry, National Institute of Technology
Nagaland, Chumukedima, Dimapur 797103, India
| | - Ambarnil Ghosh
- UCD
Conway Institute of Biomolecular & Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
| | - Sabyasachi Chatterjee
- Biophysical
Chemistry Laboratory, CSIR—Indian
Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Abhi Das
- Biophysical
Chemistry Laboratory, CSIR—Indian
Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Gopinatha Suresh Kumar
- Biophysical
Chemistry Laboratory, CSIR—Indian
Institute of Chemical Biology, 4, Raja S.C. Mullick Road, Kolkata 700032, India
| | - Debes Ray
- Solid
State Physics Division, Bhabha Atomic Research
Centre, Mumbai 400085, India
| | - Vinod K. Aswal
- Solid
State Physics Division, Bhabha Atomic Research
Centre, Mumbai 400085, India
| | - Jhimli Bhattacharyya
- Department
of Chemistry, National Institute of Technology
Nagaland, Chumukedima, Dimapur 797103, India
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Wu L, Wei Q, Zhang Y, Fan Y, Li M, Rong L, Xiao X, Huang X, Zou X. Effects of antibiotics on enhanced biological phosphorus removal and its mechanisms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 774:145571. [PMID: 33611003 DOI: 10.1016/j.scitotenv.2021.145571] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 01/28/2021] [Accepted: 01/29/2021] [Indexed: 06/12/2023]
Abstract
Many kinds of antibiotics are continuously discharged into wastewater and typically cause a great decrease in sewage treatment performance, whereas mechanisms of differences in the impacts of commonly used antibiotics on phosphate removal are still elusive. Thus, an enhanced biological phosphorus removal (EBPR) system, as an effective method of phosphate removal, was developed, and its performance in the treatment of artificial wastewater containing antibiotics at short- (8 h) and long-term (15 days) exposure was investigated. The results show that phosphorus removal was consistently inhibited by the addition of antibiotics with a significant difference (P < 0.05). To interpret the phenomena, mechanistic equations were developed, and the results indicate that for short-term tests, the difference was mainly caused by the suppression of polyhydroxyalkanoate (PHA) degradation and the activity of polyphosphate kinase (PPK), resulting in the different inhibition of the soluble orthophosphorus (SOP) uptake process. For long-term tests, the difference in SOP uptake was principally caused by the inhibition of PHA degradation and the activity of PPK, whereas the difference in SOP release resulted from the inhibition of activities of exopolyphosphatase (PPX) and adenylate kinase (ADK). Moreover, micro-mechanisms of such inhibition were identified from molecular docking and electrostatic potential.
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Affiliation(s)
- Ligui Wu
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Quantao Wei
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Yingying Zhang
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Yuxing Fan
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Mi Li
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Lingling Rong
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Xiaoyu Xiao
- School of Life Science, Jinggangshan University, Ji'an 343009, China
| | - Xiangfeng Huang
- College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
| | - Xiaoming Zou
- School of Life Science, Jinggangshan University, Ji'an 343009, China; Ji'an Key Laboratory of Red Soil Improvement and Sustainable Utilization, Ji'an 343009, China.
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6
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Potentially useful to NLO materials: 4-Chloro-3-(trifluoromethyl)aniline, 4-bromo-3-(trifluoromethyl)aniline and 4-fluoro-3-(trifluoromethyl)aniline are combined experimental and theoretical vibrational analysis. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.03.078] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Kupka T, Wieczorek PP. Theoretical and experimental NMR studies on muscimol from fly agaric mushroom (Amanita muscaria). SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2016; 153:216-225. [PMID: 26312739 DOI: 10.1016/j.saa.2015.08.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 07/13/2015] [Accepted: 08/12/2015] [Indexed: 06/04/2023]
Abstract
In this article we report results of combined theoretical and experimental NMR studies on muscimol, the bioactive alkaloid from fly agaric mushroom (Amanita muscaria). The assignment of (1)H and (13)C NMR spectra of muscimol in DMSO-d6 was supported by additional two-dimensional heteronuclear correlated spectra (2D NMR) and gauge independent atomic orbital (GIAO) NMR calculations using density functional theory (DFT). The effect of solvent in theoretical calculations was included via polarized continuum model (PCM) and the hybrid three-parameter B3LYP density functional in combination with 6-311++G(3df,2pd) basis set enabled calculation of reliable structures of non-ionized (neutral) molecule and its NH and zwitterionic forms in the gas phase, chloroform, DMSO and water. GIAO NMR calculations, using equilibrium and rovibrationally averaged geometry, at B3LYP/6-31G* and B3LYP/aug-cc-pVTZ-J levels of theory provided muscimol nuclear magnetic shieldings. The theoretical proton and carbon chemical shifts were critically compared with experimental NMR spectra measured in DMSO. Our results provide useful information on its structure in solution. We believe that such data could improve the understanding of basic features of muscimol at atomistic level and provide another tool in studies related to GABA analogs.
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Affiliation(s)
- Teobald Kupka
- Faculty of Chemistry, Opole University, Oleska 48, 45-052 Opole, Poland.
| | - Piotr P Wieczorek
- Faculty of Chemistry, Opole University, Oleska 48, 45-052 Opole, Poland.
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8
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Vibrational spectra analysis, NBO, HOMO–LUMO, and nonlinear optical behavior studies on 3-(3,4-dimethoxyphenyl)-1-(pyridin-2-yl)prop-2-en-1-one. MONATSHEFTE FUR CHEMIE 2015. [DOI: 10.1007/s00706-015-1567-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Rumyantsev M, Sitnikov NS, Somov NV. Hydrogen-Bond-Assisted Organocatalytic Acetalization of Secondary Alcohols: Experimental and Theoretical Studies. J Phys Chem A 2015; 119:4108-17. [DOI: 10.1021/acs.jpca.5b02102] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Misha Rumyantsev
- Nizhny Novgorod State Technical University n.a. R.E. Alekseev, 24 minin st., Nizhny Novgorod 603950, Russia
- Lobachevsky State University of Nizhni Novgorod, 23 Prospekt Gagarina (Gagarin Avenue), Nizhny
Novgorod 603950, Russia
| | - Nikolay S. Sitnikov
- Lobachevsky State University of Nizhni Novgorod, 23 Prospekt Gagarina (Gagarin Avenue), Nizhny
Novgorod 603950, Russia
| | - Nikolay V. Somov
- Lobachevsky State University of Nizhni Novgorod, 23 Prospekt Gagarina (Gagarin Avenue), Nizhny
Novgorod 603950, Russia
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Suresh M, Syed Ali Padusha M, Govindarasu K, Kavitha E. Synthesis, structural and spectral analysis of 1-(pyrazin-2-yl) piperidin-2-ol by density functional theory. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 138:271-282. [PMID: 25498824 DOI: 10.1016/j.saa.2014.11.063] [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: 08/18/2014] [Revised: 10/24/2014] [Accepted: 11/20/2014] [Indexed: 06/04/2023]
Abstract
The organic compound 1-(pyrazin-2-yl) piperidin-2-ol (abbreviated as PPOL) has been synthesized and characterized by IR, Raman, (1)H NMR and UV-Vis spectroscopy. The Fourier-transform Raman (3500-50cm(-1)) and infrared spectra (4000-400cm(-1)) were recorded in the solid state and interpreted by comparison with theoretical spectra derived from density functional theory (DFT) calculations. The optimized geometry, frequency and intensity of the vibrational bands of the compound was obtained by the density functional theory using 6-31G(d,p) basis set. In the optimized geometry results shows that geometry parameters are good agreement with XRD values. Stability of the molecule arising from hyper conjugative interactions, charge delocalization has been analyzed using natural bond orbital (NBO) analysis. In calculation of electronic absorption spectra, TD-DFT calculations were carried out in the both gas and solution phases. (1)H NMR chemical shifts were calculated by using the gauge-invariant atomic orbital (GIAO) method. (1)H NMR analysis is evident for O-H⋯O intermolecular interaction of the title molecule. The thermodynamic properties of the title compound have been calculated at different temperatures and the results reveal that the standard heat capacities (Cp,m), standard entropies (Sm) and standard enthalpy changes (Hm) increase with rise in temperature. In addition, HOMO and LUMO energies and the first-order hyperpolarizability have been computed.
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Affiliation(s)
- M Suresh
- PG & Research Department of Chemistry, Jamal Mohamed College, Tiruchirappalli 620 020, India.
| | - M Syed Ali Padusha
- PG & Research Department of Chemistry, Jamal Mohamed College, Tiruchirappalli 620 020, India.
| | - K Govindarasu
- Department of Physics (Engg.), Annamalai University, Annamalainagar 608 002, India
| | - E Kavitha
- Department of Physics (Engg.), Annamalai University, Annamalainagar 608 002, India
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11
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Polat T, Yurdakul Ş. Quantum chemical and spectroscopic (FT-IR and FT-Raman) investigations of 3-methyl-3h-imidazole-4-carbaldehyde. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:683-696. [PMID: 24996210 DOI: 10.1016/j.saa.2014.05.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 05/02/2014] [Accepted: 05/09/2014] [Indexed: 06/03/2023]
Abstract
FT-IR and FT-Raman spectra of 3-methyl-3h-imidazole-4-carbaldehyde (3M3HI4C) were recorded in the region 4000-400cm(-1) and 3500-50cm(-1), respectively. Optimized geometric parameters, conformational equilibria, normal mode frequencies, and corresponding vibrational assignments of 3M3HI4C were theoretically examined by quantum chemical methods for the first time. All vibrational frequencies were assigned in detail with the help of total energy distribution (TEDs). The experimental wavenumbers were compared with the scaled vibrational frequencies determined by DFT/B3LYP method. The results showed that the B3LYP/6-311++G(d,p) method predicts vibrational frequencies and the structural parameters effectively. The most stable conformer of the title compound was determined. The total electron density and molecular electrostatic potential surfaces of the molecule were constructed by using B3LYP/6-311++G(d,p) method to display electrostatic potential (electron+nuclei) distribution. The electronic properties HOMO and LUMO energies were measured. The lower energy band was assigned to the HOMO→LUMO transition. Natural bond orbital analysis of title molecule has been performed to indicate the presence of intramolecular charge transfer. Energies, relative stabilities, and dipole moments of title molecule were also compared and analyzed in the gas phase and in solvents. Furthermore, solvent effects on the geometry and vibrational frequency of 3M3HI4C were studied theoretically at the DFT/B3LYP level in combination with the conductor polarizable continuum model (C-PCM).
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Affiliation(s)
- Turgay Polat
- Department of Physics, Faculty of Arts and Sciences, Kastamonu University, Kuzeykent, 37100 Kastamonu, Turkey.
| | - Şenay Yurdakul
- Department of Physics, Faculty of Science, Gazi University, Teknikokullar, 06500 Ankara, Turkey
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Balachandran V, Murugan M, Nataraj A, Karnan M, Ilango G. Comparative vibrational spectroscopic studies, HOMO-LUMO, NBO analyses and thermodynamic functions of p-cresol and 2-methyl-p-cresol based on DFT calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 132:538-549. [PMID: 24892532 DOI: 10.1016/j.saa.2014.04.194] [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: 02/20/2014] [Revised: 04/23/2014] [Accepted: 04/30/2014] [Indexed: 06/03/2023]
Abstract
In the present study structural properties of p-cresol, and 2-methoxy-p-cresol have been studied by using B3LYP/cc-pvdz and B3PW91/cc-pvdz of Density Functional Theory (DFT) utilizing Becke three exchange functional and Lee Yang Paar correlation functional. The Fourier transform infrared and Fourier transform Raman spectra of title molecules were recorded (solid phase). Optimized geometry, harmonic vibrational frequencies and various thermodynamic parameters of the title compounds were calculated with B3LYP/cc-pvdz, and B3PW91/cc-pvdz basis sets. Non-linear optical (NLO) behavior of the p-cresol and 2-methoxy-p-cresol were investigated by determining of electric dipole moment, polarizability α, and hyperpolarizability β using the above mentioned basis sets. The molecular properties such as ionization potential, electronegativity, chemical potential, electrophilicity have been deduced from HOMO-LUMO analysis employing the same basis sets. A detailed interpretation of the infrared and Raman spectra of title molecules were reported. 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 molecules have also been constructed.
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Affiliation(s)
- V Balachandran
- Department of Physics, Arignar Anna Government Arts College, Musiri, Tiruchirappalli 621211, India.
| | - M Murugan
- Department of Physics, Govt. Arts College, Tiruchirappalli 620022, India
| | - A Nataraj
- Department of Physics, SRM University, Ramapuram, Chennai 600089, India
| | - M Karnan
- Department of Physics, Srimad Andavan Arts and Science College, Tiruchirappalli 620005, India
| | - G Ilango
- Department of Physics, M.I.E.T. Engineering College, Tiruchirappalli 620007, India
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Determination of bicuculline in rat plasma by liquid chromatography mass spectrometry and its application in a pharmacokinetic study. J Chromatogr B Analyt Technol Biomed Life Sci 2014; 953-954:143-6. [DOI: 10.1016/j.jchromb.2014.02.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 01/16/2014] [Accepted: 02/10/2014] [Indexed: 11/19/2022]
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Mishra R, Joshi BD, Srivastava A, Tandon P, Jain S. Quantum chemical and experimental studies on the structure and vibrational spectra of an alkaloid--Corlumine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 118:470-480. [PMID: 24080578 DOI: 10.1016/j.saa.2013.09.015] [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: 05/30/2013] [Revised: 08/23/2013] [Accepted: 09/02/2013] [Indexed: 06/02/2023]
Abstract
The study concentrates on an important natural product, phthalide isoquinoline alkaloid Corlumine (COR) [(6R)-6-[(1S)-1,2,3,4-Tetrahydro-6,7-dimethoxy-2-methylisoquinolin-1-yl] furo [3,4-e]-1,3-benzodioxol-8(6H)-one] well known to exhibit spasmolytic and GABA antagonist activity. It was fully characterized by a variety of experimental methods including vibrational spectroscopy (IR and Raman), thermal analysis (DSC), UV and SEM. For a better interpretation and analysis of the results quantum chemical calculations employing DFT were also performed. TD-DFT was employed to elucidate electronic properties for both gaseous and solvent environment using IEF-PCM model. Graphical representation of HOMO and LUMO would provide a valuable insight into the nature of reactivity and some of the structural and physical properties of the title molecule. The structure-activity relationship have been interpreted by mapping electrostatic potential surface (MEP), which is valuable information for the quality control of medicines and drug-receptor interactions. Stability of the molecule arising from hyper conjugative interactions, charge delocalisation has been analyzed using natural bond orbital (NBO) analysis. Computation of thermodynamical properties would help to have a deep insight into the molecule for further applications.
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Affiliation(s)
- Rashmi Mishra
- Department of Physics, University of Lucknow, Lucknow 226007, India
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15
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Srivastava A, Mishra R, Joshi B, Gupta V, Tandon P. A comparative computational study on molecular structure, NBO analysis, multiple interactions, chemical reactivity and first hyperpolarisability of imatinib mesylate polymorphs using DFT and QTAIM approach. MOLECULAR SIMULATION 2013. [DOI: 10.1080/08927022.2013.848279] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Karnan M, Balachandran V, Murugan M, Murali MK, Nataraj A. Vibrational (FT-IR and FT-Raman) spectra, NBO, HOMO-LUMO, Molecular electrostatic potential surface and computational analysis of 4-(trifluoromethyl)benzylbromide. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 116:84-95. [PMID: 23912046 DOI: 10.1016/j.saa.2013.06.120] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Accepted: 06/28/2013] [Indexed: 06/02/2023]
Abstract
In this work, the vibrational characteristics of 4-(trifluoromethyl) benzylbromide (TFMBB) have been investigated and both the experimental and theoretical vibrational data indicate the presence of functional groups in the title molecule. The density functional theoretical (DFT) computations were performed at the B3LYP/6-311+G (d,p) levels to derive the optimized geometry, vibrational wavenumbers with IR and Raman intensities. Furthermore, the molecular orbital calculations such as natural bond orbitals (NBOs), HOMO-LUMO energy gap and Mapped molecular electrostatic potential (MEP) surfaces were also performed with the same level of DFT. The thermal flexibility of molecule in associated with vibrational temperature was also illustrated on the basis of correlation graphs. The detailed interpretation of the vibrational spectra has been carried out with the aid of potential energy distribution (PED) results obtained from MOLVIB program. The delocalization of electron density of various constituents of the molecule has been discussed with the aid of NBO analysis.
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Affiliation(s)
- M Karnan
- Department of Physics, Srimad Andavan Arts and Science College, Tiruchirappalli 620005, India
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Joshi BD, Srivastava A, Gupta V, Tandon P, Jain S. Spectroscopic and quantum chemical study of an alkaloid aristolochic acid I. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 116:258-269. [PMID: 23954541 DOI: 10.1016/j.saa.2013.07.036] [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: 03/04/2013] [Revised: 07/10/2013] [Accepted: 07/21/2013] [Indexed: 06/02/2023]
Abstract
Aristolochic acids (AAs) (Aristolochiaceae) are used in the traditional Chinese herb medicine. We have presented the geometry optimization, electrostatic potential surface, frontier orbital energy gap and vibrational wavenumbers of aristolochic acid I (AA I) using ab initio Hartree-Fock (HF) and density functional theory (DFT/B3LYP) method employing 6-311G(d,p) basis set. A complete vibrational assignment has been done on the basis of calculations on monomer and dimer of AA I. The UV-vis absorption spectrum has been recorded in ethanol solvent and compared with the calculated one in the gas phase as well as in solvent environment (integral-equation formalism polarizable continuum model; IEF-PCM) using TD-DFT/6-31G basis set. A short outline of the NBO analysis segment with their structural meaning has been presented. The variation of thermodynamic properties with temperature was calculated theoretically and the thermal response of the compound has been recorded with the help of differential scanning calorimetry (DSC) in N2 environment.
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Affiliation(s)
- Bhawani Datt Joshi
- Department of Physics, University of Lucknow, Lucknow 226007, India; Department of Physics, Siddhanath Sc. Campus, Tribhuvan University, Nepal
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Prabavathi N, Nilufer A, Krishnakumar V. FT-IR, FT-Raman and DFT quantum chemical study on the molecular conformation, vibrational and electronic transitions of 1-(m-(trifluoromethyl)phenyl)piperazine. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 121:483-493. [PMID: 24291424 DOI: 10.1016/j.saa.2013.10.102] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2013] [Revised: 10/25/2013] [Accepted: 10/31/2013] [Indexed: 06/02/2023]
Abstract
The FTIR and FT-Raman spectra of 1-(m-(trifluoromethyl)phenyl)piperazine [TFMPP] have been recorded in the region 4000-400 cm(-1) and 3500-100 cm(-1), respectively. The optimized geometry, frequency and intensity of the vibrational bands of the compound was obtained by the density functional theory using 6-311++G(d,p) basis set. The harmonic vibrational frequencies were calculated and the scaled values have been compared with experimental FTIR and FT-Raman spectra. The observed and the calculated frequencies are found to be in good agreement. A detailed interpretation of the infrared and Raman spectra were also reported based on potential energy distribution (PED). UV-Vis spectrum of the compound was recorded and the electronic properties HOMO and LUMO energies were measured by TD-DFT approach. Furthermore, molecular electrostatic potential is performed and also the calculated HOMO and LUMO energies show that charge transfer occurs within the molecule.
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Affiliation(s)
- N Prabavathi
- Department of Physics, Sri Sarada College for Women (Autonomous), Salem 636 016, India.
| | - A Nilufer
- Department of Physics, Sri Sarada College for Women (Autonomous), Salem 636 016, India
| | - V Krishnakumar
- Department of Physics, Periyar University, Salem 636 011, India
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Joshi BD, Srivastava A, Honorato SB, Tandon P, Pessoa ODL, Fechine PBA, Ayala AP. Study of molecular structure, vibrational, electronic and NMR spectra of oncocalyxone A using DFT and quantum chemical calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 113:367-377. [PMID: 23747376 DOI: 10.1016/j.saa.2013.05.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 05/07/2013] [Accepted: 05/08/2013] [Indexed: 06/02/2023]
Abstract
Oncocalyxone A (C17H18O5) is the major secondary metabolite isolated from ethanol extract from the heartwood of Auxemma oncocalyx Taub popularly known as "pau branco". Oncocalyxone A (Onco A) has many pharmaceutical uses such as: antitumor, analgesic, antioxidant and causative of inhibition of platelet activation. We have performed the optimized geometry, total energy, conformational study, molecular electrostatic potential mapping, frontier orbital energy gap and vibrational frequencies of Onco A employing ab initio Hartree-Fock (HF) and density functional theory (DFT/B3LYP) method with 6-311++G(d,p) basis set. Stability of the molecule arising from hyperconjugative interactions and/or charge delocalization has been analyzed using natural bond orbital (NBO) analysis. UV-vis spectrum of the compound was recorded in DMSO and MeOH solvent. The TD-DFT calculations have been performed to explore the influence of electronic absorption spectra in the gas phase, as well as in solution environment using IEF-PCM and 6-31G basis set. The (13)C NMR chemical shifts have been calculated with the B3LYP/6-311++G(d,p) basis set and compared with the experimental values. These methods have been used as tools for structural characterization of Onco A.
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Karthick T, Balachandran V, Perumal S, Nataraj A. Vibrational (FT-IR and FT-Raman) spectra and quantum chemical studies on the molecular orbital calculations, chemical reactivity and thermodynamic parameters of 2-chloro-5-(trifluoromethyl) aniline. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 107:72-81. [PMID: 23416911 DOI: 10.1016/j.saa.2013.01.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2012] [Revised: 12/22/2012] [Accepted: 01/11/2013] [Indexed: 06/01/2023]
Abstract
In this work, the vibrational characteristics of 2-chloro-5-(trifluoromethyl) aniline have been investigated and both the experimental and theoretical vibrational data indicate the presence of various functional groups within the title molecule. The influence of chlorine substituent on the vibrational wavenumbers of a molecule in comparison with aniline and trifluoromethyl aniline has been discussed in detail. The density functional theoretical (DFT) computations were performed at the B3LYP/6-31++G(3df,3pd)/6-31G(3df,3pd) levels to derive the optimized geometry, vibrational wavenumbers with IR and Raman intensities. Furthermore, the molecular orbital calculations such as; natural bond orbitals (NBOs) and HOMO-LUMO energy gap and mapped molecular electrostatic potential (MEP) surfaces were also performed with the same level of DFT. The temperature dependence thermodynamic parameters of a molecule were illustrated on the basis of their correlation graphs. The detailed interpretation of the vibrational spectra has been carried out with the aid of potential energy distribution (PED) results obtained from MOLVIB program. The delocalization of electron density in various constituents of the molecule has been discussed with the aid of NBO and HOMO-LUMO energy gap analysis.
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Affiliation(s)
- T Karthick
- Department of Physics, Vivekanandha College for Women, Tiruchengode 637 205, India
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