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Ganesan M, Paranthaman S. Molecular structure, interactions, and antimicrobial properties of curcumin-PLGA Complexes-a DFT study. J Mol Model 2021; 27:329. [PMID: 34708279 DOI: 10.1007/s00894-021-04952-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 10/15/2021] [Indexed: 10/20/2022]
Abstract
Density functional calculations are performed to study the molecular structure, interactions, and antimicrobial activity of curcumin-poly lacto glycolic acid (Cur-PLGA) complexes. The calculations are performed on curcumin (Cur), glycolic acid (SSC and AAT conformers), lactic acid (LA), Cur-SSC, Cur-AAT, Cur-LA, and Cur-PLGA complexes using dispersion corrected M06-2X functional with 6-31 + G* basis set. The condensed Fukui functions of Cur are calculated to identify the favorable reactive sites. Inter- and intramolecular H-bond interactions are analyzed in detail through natural bond orbital, Atoms in Molecule, and Reduced density gradient analyses. The interaction energy values indicate that the interaction between Cur and AAT is stronger than the other studied complexes. Further, our calculations show that the PLGA interacted with Cur is having lower LUMO energy and density values. This indicates that the antimicrobial activity is high in this complex.
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Affiliation(s)
- Mahendiraprabu Ganesan
- Department of Physics and International Research Centre, Kalasalingam Academy of Research and Education (Deemed To Be University), Krishnankoil, 626 126, India
| | - Selvarengan Paranthaman
- Department of Physics and International Research Centre, Kalasalingam Academy of Research and Education (Deemed To Be University), Krishnankoil, 626 126, India.
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2
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Wang Q, Gong H, Zhang Y, Peng Y, Chen H, Li M, Deng H, Hao J, Wan W. Visible-light mediated stereospecific C(sp 2)-H difluoroalkylation of ( Z)-aldoximes. Org Biomol Chem 2021; 19:7867-7874. [PMID: 34492676 DOI: 10.1039/d1ob01401c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A visible light mediated stereospecific C(sp2)-H difluoroalkylation of (Z)-aldoximes to (E)-difluoroalkylated ketoximes has been described. In this reaction, (hetero)-aromatic and aliphatic difluoroalkylated ketoximes could be obtained with the retention of the configuration of the starting aldoximes. A preliminary mechanism study showed that a difluoromethyl radical via an SET pathway was involved.
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Affiliation(s)
- Qian Wang
- Department of Chemistry, Shanghai University, Shanghai, China.
| | - Haiying Gong
- Department of Chemistry, Shanghai University, Shanghai, China.
| | - Yifang Zhang
- Department of Chemistry, Shanghai University, Shanghai, China.
| | - Yi Peng
- Department of Chemistry, Shanghai University, Shanghai, China.
| | - Hua Chen
- Department of Chemistry, Shanghai University, Shanghai, China.
| | - Mingjie Li
- Department of Chemistry, Shanghai University, Shanghai, China.
| | - Hongmei Deng
- Laboratory of Microstructures, Shanghai University, China
| | - Jian Hao
- Department of Chemistry, Shanghai University, Shanghai, China.
| | - Wen Wan
- Department of Chemistry, Shanghai University, Shanghai, China.
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Yang X, Huang Y, Liu G, Liu J, Ma L, Niu X, Qu X. A DFT prediction on the chemical reactivity of novel azolethione derivatives as chelating agents: Implications for copper minerals flotation and copper corrosion inhibition. J Taiwan Inst Chem Eng 2018. [DOI: 10.1016/j.jtice.2018.09.022] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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4
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Kucuk I, Kaya Y, Kaya AA. Structural, spectroscopic (FT-IR, NMR, UV–visible), nonlinear optical (NLO), cytotoxic and molecular docking studies of 4-nitro-isonitrosoacetophenone (ninapH) by DFT method. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.03.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Yang X, Liu S, Liu G, Zhong H. A DFT study on the structure–reactivity relationship of aliphatic oxime derivatives as copper chelating agents and malachite flotation collectors. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2016.11.010] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Catalytic oxidation of primary aromatic alcohols using half sandwich Ir(III), Rh(III) and Ru(II) complexes: A practical and theoretical study. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2016.06.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Kaya Y. Density Functional Study of the Reaction Mechanism of Two Oxiimine Alcohol Formations and Their Novel Rearrangements. Helv Chim Acta 2016. [DOI: 10.1002/hlca.201500155] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Yunus Kaya
- Department of Chemistry; Faculty of Arts and Sciences; Uludag University; TR-16059 Bursa Turkey
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Kaya Y, Icsel C, Yilmaz VT, Buyukgungor O. Structural, spectroscopic and quantum chemical studies of acetyl hydrazone oxime and its palladium(II) and platinum(II) complexes. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2015.04.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Kaya Y, Icsel C, Yilmaz VT, Buyukgungor O. A palladium(II) complex containing both carbonyl and imine oxime ligands: crystal structure, experimental and theoretical UV-vis, IR and NMR studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 108:133-140. [PMID: 23466323 DOI: 10.1016/j.saa.2013.01.054] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 01/22/2013] [Accepted: 01/23/2013] [Indexed: 06/01/2023]
Abstract
A new palladium(II) complex, [Pd(ppeieo)(inap)]·DMSO (ppeieo=(1E,2E)-phenyl-[(1-phenylethyl)imino]-ethanal oxime and inap=isonitrosoacetophenone) has been synthesized and characterized by elemental analysis, UV-vis, IR, NMR. X-ray diffraction analysis of the DMSO solvate of the complex shows that the palladium(II) ion is coordinated in a distorted square-planar geometry by ppeieo and inap, which is formed during the hydrolysis of ppeieo. DFT (B3LYP/LANL2DZ) calculations on the complex have been carried out to correlate geometry and spectroscopic properties such as electronic, vibrational and NMR chemical shifts. The complete vibrational frequency assignments were made and the calculation results were applied to simulate infrared spectra of the title compound which shows good agreement with observed spectra. The calculated HOMO and LUMO energies show that several transitions including the π→π(*) and charge transfer occur within the molecule. The chemical shifts reasonably correspond to the calculated spectra.
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Affiliation(s)
- Yunus Kaya
- Department of Chemistry, Faculty of Arts and Sciences, Uludag University, 16059 Bursa, Turkey
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Kaya Y, Yilmaz VT, Arslan T, Buyukgungor O. Experimental and theoretical DFT studies of structure, spectroscopic and fluorescence properties of a new imine oxime derivative. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.05.032] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Liao RZ, Thiel W. Why Is the Oxidation State of Iron Crucial for the Activity of Heme-Dependent Aldoxime Dehydratase? A QM/MM Study. J Phys Chem B 2012; 116:9396-408. [DOI: 10.1021/jp305510c] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Rong-Zhen Liao
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470, Mülheim an der Ruhr, Germany
| | - Walter Thiel
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470, Mülheim an der Ruhr, Germany
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ABIRAM A, KOLANDAIVEL P. INTERACTION OF THE TAUTOMERIC STATES OF HISTIDINE WITH Cu AND Zn METAL IONS – A THEORETICAL STUDY. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s021963360900499x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A density functional study on the interaction of Cu 2+ and Zn 2+ metal ions at the predominant positions of N τ– H and N π– H histidine tautomers has been performed. The fully optimized energy of the isolated histidine tautomers at B3LYP/6-311++G** level of theory depicts N τ– H tautomer to be much stable compared to that of the N π– H tautomer. The interaction of metal ions forms bidentate and tridentate complexes with N τ– H tautomer, while it is absent in the case of N π– H tautomer emphasizing the role of former in structural determination of liganated proteins. The Zn 2+ ion induces a barrier-free proton transfer when interacted at the carbonyl position of N τ– H histidine tautomer necessitating the tautomer to be in the zwitterionic form for complexation. The thermodynamical analysis predicts a blue shift in the NH and CO stretching vibrational frequencies and suggests N τ– H tautomer to be best suitable for Cu 2+ and Zn 2+ ion interactions. The topological and charge transfer studies in concert with frontier molecular orbital (FMO) analysis confirm the covalent interaction, validating the findings based on the geometrical data.
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Affiliation(s)
- A. ABIRAM
- Department of Physics, Bharathiar University, Coimbatore-641 046, India
| | - P. KOLANDAIVEL
- Department of Physics, Bharathiar University, Coimbatore-641 046, India
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Gálvez J, Guirado A. A theoretical study of topomerization of imine systems: inversion, rotation or mixed mechanisms? J Comput Chem 2010; 31:520-31. [PMID: 19548252 DOI: 10.1002/jcc.21323] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The different mechanisms, rotation, inversion, or intermediate mechanism, by which occur the topomerization of imine systems R(2) C=N-X have been studied by applying ab initio, B3LYP, and MP2 methods. The effect of a wide variety of substituents R and X on the isomerization pathway have been examined by computing fully optimized structures of the ground and transition states (136 isomers belonging to different imine families were studied and more than 300 transition structures were determined at various levels of theory). Energy barriers have been also obtained and it was found that the groups R and X have a strong influence on the type of mechanism involved and the activation energies. Thus, and depending on the type of substituents, transition state structures related to the following kinds of processes were found: pure inversion, intermediate mechanisms, rotation, and enhanced rotation (hyper-rotation). In turn, the corresponding activation energies range between very low (<10 kcal/mol) and extremely high (> 70 kcal/mol) values. A simple index that allows us to quantify the percentage of inversion or rotation mechanism is proposed.
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Affiliation(s)
- Jesús Gálvez
- Departamento de Química Física, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30071-Murcia, Apartado 4021, Spain.
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A new and efficient synthetic approach to dichlorofluoflavines. Study of the stability of isomeric fluoflavines by HF and B3LYP procedures. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.01.059] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Conformational Analysis, Infrared, and Fluorescence Spectra of 1-Phenyl-1,2-propandione 1-oxime and Related Tautomers: Experimental and Theoretical Study. MONATSHEFTE FUR CHEMIE 2007. [DOI: 10.1007/s00706-007-0657-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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18
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Umar Y, Jimoh T, Morsy M. Ab initio and density functional calculations of the structures and vibrational spectra of formaldoxime. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.theochem.2005.03.036] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Padmanabhan J, Parthasarathi R, Sarkar U, Subramanian V, Chattaraj P. Effect of solvation on the condensed Fukui function and the generalized philicity index. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2003.11.013] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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20
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Senthilkumar K, Kolandaivel P. Structure, conformation and NMR studies on 1,2-dioxane and halogen substituted 1,2-dioxane molecules. Comput Biol Chem 2003; 27:173-83. [PMID: 12927094 DOI: 10.1016/s0097-8485(02)00019-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Molecular structure and conformational stability of chair and twist conformers of 1,2-dioxane and halogen substituted compounds of the 1,2-dioxane have been studied using ab initio and density functional theory (DFT) methods. The molecular geometries of 1,2-dioxane, 3,6-difluoro, 3,6-dichloro, 3,3,6,6-tetrafluoro and 3,3,6,6-tetrachloro 1,2-dioxane compounds were optimized at HF, MP2, B3LYP and B3PW91 levels of theory by implementing 6-31G* basis set. To study the effect of polar medium, self-consistent reaction field theory is used to optimize the conformers at B3LYP/6-31G* level of theory. The geometrical parameters of chair and twist conformers have been discussed in the light of interaction between lone pair electrons present in the oxygen and substituted halogen atoms. The relative stability of the conformers have been studied using relative energy, maximum hardness principle and thermodynamical quantities. The 13C-NMR chemical shift study for carbon atoms in the title compounds are calculated and the results have been discussed.
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Affiliation(s)
- K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore 641 046, India.
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Origin of the cis effect—nonbonded intramolecular interactions: quantum chemical studies on 1,2-dihaloethylene molecules. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00250-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Senthilkumar K, Kolandaivel P. Post Hartree-Fock and density functional theory studies on structure and conformational stability of nitrosoethylene and substituted compounds of nitrosoethylene. COMPUTERS & CHEMISTRY 2002; 26:207-21. [PMID: 11868910 DOI: 10.1016/s0097-8485(01)00109-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Post Hartree-Fock and density functional theory (DFT) methods were used to study the different conformers of nitrosoethylene H-CH=CH-NO, and substituted compounds of the nitrosoethylene R-CH=CH-NO (R = Cl, NH2, N(CH3)2, OH, OCH3). The molecules were optimized at MP2/6-31G* level of theory of ab initio and B3LYP/6-31G* and B3PW91/6-31G* levels of theory of DFT. Special emphasis has been given to the effect of substitution of pi-electron donor groups NH2, N(CH3)2, OH, and OCH3, which play a major role in modifying the geometrical parameters of -N=O group by the electronic transmission effects through the central group -CH=CH-. The ability of DFT methods to predict the bond length adjacent to the atoms having lone pair electrons has been discussed. The conformational stabilities have been studied using the relative energies and DFT parameters such as chemical hardness and chemical potential. The role of intra-molecular hydrogen bond on the equilibrium structure has been discussed. The vibrational spectra for the different conformers of the nitrosoethylene and substituted compounds have been generated using the MP2/6-31G* level of theory.
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Affiliation(s)
- K Senthilkumar
- Department of Physics, Bharathiar University, Coimbatore, India
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Kanakaraju R, Kolandaivel P, Gowenlock B. Quantum chemical studies of nitrosobuta-1,3-diene and nitrosostyrene molecules. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(01)00660-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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