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Mejía Zarate F, Carranza MA, Miquel HT, Bazán-Jiménez A, García-Revilla MA, Martínez JLB. Synthesis and computational characterization of aryl-fluorinated thiazoles; experimental, DFT and molecular coupling studies. J Fluor Chem 2022. [DOI: 10.1016/j.jfluchem.2022.110024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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2
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Kavitha E, Ramarajan D, Rakić A, Dimić D, Sudha S, Nirmala PN. Structural, spectroscopic, quantum chemical, and molecular docking investigation of (E)-N'-(2,5-dimethoxybenzylidene)picolinohydrazide. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132259] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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3
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Suresh CH, Remya GS, Anjalikrishna PK. Molecular electrostatic potential analysis: A powerful tool to interpret and predict chemical reactivity. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2022. [DOI: 10.1002/wcms.1601] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Cherumuttathu H. Suresh
- Chemical Sciences and Technology Division CSIR‐National Institute for Interdisciplinary Science and Technology Thiruvananthapuram Kerala India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad India
| | - Geetha S. Remya
- Chemical Sciences and Technology Division CSIR‐National Institute for Interdisciplinary Science and Technology Thiruvananthapuram Kerala India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad India
| | - Puthannur K. Anjalikrishna
- Chemical Sciences and Technology Division CSIR‐National Institute for Interdisciplinary Science and Technology Thiruvananthapuram Kerala India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad India
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4
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K P SH, K A AR, Medammal Z, Thayyil MS, Babu TD. Theoretical Insights into the Radical Scavenging Activity of Glipizide: DFT and Molecular Docking Studies. Free Radic Res 2022; 56:53-62. [PMID: 35086396 DOI: 10.1080/10715762.2022.2034803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Glipizide is a N-sulfonylurea compound used in the treatment of hyperglycemia in patients with Type 2 diabetes mellitus. In the present study, DFT-based computational methods and molecular docking studies have been performed to systematically evaluate the radical scavenger behavior of the title molecule. Structural characteristics such as molecular descriptors, frontier molecular orbitals, molecular potential mapping, and Mulliken charge population have been investigated. Thermodynamic parameters like proton affinity (PA), ionization potential (IP), bond dissociation energy (BDE), electron transfer enthalpy (ETE), and proton dissociation enthalpy (PDE) related to three antiradical mechanisms namely hydrogen atom transfer (HAT), sequential electron transfer proton transfer (SETPT) and sequential proton loss electron transfer (SPLET) have been studied. Also, molecular docking studies have been carried out to have a theoretical understanding of the molecular mechanism and for the elucidation of binding mode/modes of a compound targeted through non-covalent interactions. The obtained results are of great significance in better understanding the reaction mechanism of the title molecule and open new perspectives for the design of new potent antioxidant agents.
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Affiliation(s)
- Safna Hussan K P
- Department of Biochemistry, Amala Cancer Research Center, Amala Nagar, Thrissur, Kerala, 680555
| | - Abdul Rahoof K A
- Department of Physics, Sullamussalam Science College Areacode, Malappuram-673639, Kerala, India
| | - Zubair Medammal
- Department of Physics, University of Calicut, Malappuram-673635, Kerala, India
| | - M Shahin Thayyil
- Department of Zoology, University of Calicut, Malappuram-673635, Kerala, India
| | - Thekkekara D Babu
- Department of Biochemistry, Amala Cancer Research Center, Amala Nagar, Thrissur, Kerala, 680555
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5
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Francotte R, Irons TJP, Teale AM, de Proft F, Geerlings P. Extending conceptual DFT to include external variables: the influence of magnetic fields. Chem Sci 2022; 13:5311-5324. [PMID: 35655570 PMCID: PMC9093152 DOI: 10.1039/d1sc07263c] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/24/2022] [Indexed: 11/21/2022] Open
Abstract
An extension of conceptual DFT to include the influence of an external magnetic field is proposed in the context of a program set up to cope with the ever increasing variability of reaction conditions and concomitant reactivity.
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Affiliation(s)
- Robin Francotte
- Research Group of General Chemistry (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
| | - Tom J. P. Irons
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Andrew M. Teale
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway
| | - Frank de Proft
- Research Group of General Chemistry (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
| | - Paul Geerlings
- Research Group of General Chemistry (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium
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6
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Clarys T, Stuyver T, De Proft F, Geerlings P. Extending conceptual DFT to include additional variables: oriented external electric field. Phys Chem Chem Phys 2021; 23:990-1005. [PMID: 33404573 DOI: 10.1039/d0cp05277a] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The extension of the E = E[N, v] functional for exploring chemical reactivity in a conceptual DFT context to include external electric fields is discussed. Concentrating on the case of a homogeneous field the corresponding response functions are identified and integrated, together with the conventional response functions such as permanent dipole moment and polarizability, in an extended response function tree associated with the E = E[N, v, ε] functional. In a case study on the dihalogens F2, Cl2, Br2, I2 the sensitivity of condensed atomic charges (∂q/∂ε) is linked to the polarizability of the halogen atoms. The non-integrated (∂ρ(r)/∂ε) response function, directly related to the field induced density change, is at the basis of these features. It reveals symmetry breaking for a perpendicular field, not detectable in its atom condensed counterpart, and accounts for the induced dipole moment directly related to the molecular polarizability. The much higher sensitivity of the electronic chemical potential/electronegativity as compared to the chemical hardness is highlighted. The response of the condensed Fukui functions to a parallel electric field increases when going down in the periodic table and is interpreted in terms of the extension of the outer contours in the non-condensed Fukui function. In the case of a perpendicular field the (∂f(r)/∂ε) response function hints at stereoselectivity with a preferential side of attack which is not retrieved in its condensed form. In an application the nucleophilic attack on the carbonyl group in H2CO is discussed. Similar to the dihalogens, stereoselectivity is displayed in the Fukui function for nucleophilic attack (f+) in the case of a perpendicular electric field, and opposite to the one that would arise based on the induced density. Disentangling the expression for the evolution of the Fukui function in the presence of an electric field reveals that this difference can be traced back to local differences in the polarization or induced density between the anionic and the neutral system. This difference may be exploited, e.g. for an appropriately substituted H2CO, to generate enantioselectivity.
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Affiliation(s)
- Tom Clarys
- Research Group of General Chemistry (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium.
| | - Thijs Stuyver
- Research Group of General Chemistry (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium. and Institute of Chemistry, The Hebrew University, Jerusalem, 91904, Israel
| | - Frank De Proft
- Research Group of General Chemistry (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium.
| | - Paul Geerlings
- Research Group of General Chemistry (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium.
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7
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Rouhani M. Evaluation of structural properties and antioxidant capacity of Proxison: A DFT investigation. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2020.113096] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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8
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Babaei S, Niad M. Chemical reactivity descriptors as a tool of prediction in the synthesis of sandwich type polyoxometalate organic–inorganic hybrid compounds. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114710] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Rajan VK, Ragi C, Muraleedharan K. A computational exploration into the structure, antioxidant capacity, toxicity and drug-like activity of the anthocyanidin "Petunidin". Heliyon 2019; 5:e02115. [PMID: 32346622 PMCID: PMC7181340 DOI: 10.1016/j.heliyon.2019.e02115] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 03/05/2019] [Accepted: 07/16/2019] [Indexed: 11/29/2022] Open
Abstract
A computational investigation on the structure and antioxidant property of a natural food colorant Petunidin (PT) was performed under DFT/B3LYP/6-31+ G (d, p). PT has a drug score of +0.804 which indicates its drug-like nature. The antioxidant property of PT was well explained by HAT mechanism and it has been found that the electron releasing substituents decreases the BDE value. PT has lowest BDE value at C3 position and is confirmed by the lowest pKa value, high atomic charge and lowest bond order. PT easily donates the hydrogen atom and exists in the deprotonated form in blood as the pKa value at C3 is less than the pH value of blood. PT shows no violation to Lipinski's rule of 5 indicating its nature as an orally admissible drug. More over PT has considerable bioactivity against nuclear receptor ligand while it shows only moderate activity towards GPCR and ion channel modulator. Also it shows moderate activity as an enzyme inhibitor and protease inhibitor but shows considerable activity as a kinase inhibitor. PT is non toxic in nature and all these factors favor its use as a potential antioxidant and a drug.
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Affiliation(s)
- Vijisha K. Rajan
- Department of Chemistry, University of Calicut, Malappuram, 673635, India
| | - C. Ragi
- Department of Chemistry, University of Calicut, Malappuram, 673635, India
| | - K. Muraleedharan
- Department of Chemistry, University of Calicut, Malappuram, 673635, India
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10
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Effect of external electric field on C–X ··· π halogen bonds. J Mol Model 2019; 25:57. [DOI: 10.1007/s00894-019-3938-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 01/24/2019] [Indexed: 01/20/2023]
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11
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The natural food colorant Peonidin from cranberries as a potential radical scavenger – A DFT based mechanistic analysis. Food Chem 2018; 262:184-190. [DOI: 10.1016/j.foodchem.2018.04.074] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 04/20/2018] [Accepted: 04/20/2018] [Indexed: 12/14/2022]
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12
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Rajan VK, Shameera Ahamed TK, Muraleedharan K. Studies on the UV filtering and radical scavenging capacity of the bitter masking flavanone Eriodictyol. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 185:254-261. [PMID: 29981487 DOI: 10.1016/j.jphotobiol.2018.06.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 06/26/2018] [Accepted: 06/27/2018] [Indexed: 11/17/2022]
Abstract
A computational analysis of UV filtering and radical scavenging capacity of a flavanone, Eriodictyol has been performed under DFT-B3LYP/6-31+ G (d, p). Eriodictyol is nontoxic and nonirritant bitter masker commonly used in the wine industry. It has been reported that the flavanones were widely acceptable for photoprotection due to its potential UV filtering and radical scavenging capacity. This study provides theoretical evidence that the eriodictyol has an absorbance in the UV-A and UV-B region of the electromagnetic spectrum and therefore can be used as a potential UV filter in sunscreen lotions and other cosmetic products. The major transitions in the UV-Visible spectrum of Eriodictyol are between HOMO and HOMO-1 with LUMO level and are well explained by NBO-NLMO tool in G09 software. In addition to this, Eriodictyol is a potent antioxidant than that of the most commonly studied Quercetin. The most active site in the compound is 3' position and is confirmed by NPA, NBO and pKa value analysis. The lowest energy conformer of Eriodictyol contains a Hydrogen bond between carbonyl oxygen (O2) and H30. This is confirmed by the highest value of interaction energy between lone pairs of O2 and σ* of O3- H30. Both the two lone pairs of O2 interacts with the σ* of O3-H30. This decreases the bond order of 5 OH and at the same time it restricts the hydrogen transfer from this position to form a radical. Similarly, the lone pair of O5 (3' position) interacts with H33 resulting in the low bond order value and consequently less favorable for radical formation. These results indicate that the BDE values follow the order 3' < 4' < 7 < 5. Thus the title compound can be used for photo protection due to its potential UV filtering and radical scavenging capacity.
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Affiliation(s)
- Vijisha K Rajan
- Department of Chemistry, University of Calicut, Malappuram 673635, India
| | | | - K Muraleedharan
- Department of Chemistry, University of Calicut, Malappuram 673635, India.
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13
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Experimental and density functional theory studies on benzalkonium ibuprofenate, a double active pharmaceutical ingredient. Comput Biol Chem 2018; 72:113-121. [DOI: 10.1016/j.compbiolchem.2017.12.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 11/21/2017] [Accepted: 12/08/2017] [Indexed: 11/18/2022]
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14
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On the effect of external perturbation on amino acid salt bridge: a DFT study. J CHEM SCI 2017. [DOI: 10.1007/s12039-017-1266-6] [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]
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15
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Boruah A, Borpuzari MP, Kawashima Y, Hirao K, Kar R. Assessment of range-separated functionals in the presence of implicit solvent: Computation of oxidation energy, reduction energy, and orbital energy. J Chem Phys 2017; 146:164102. [DOI: 10.1063/1.4981529] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Abhijit Boruah
- Department of Chemistry, Dibrugarh University, Dibrugarh, Assam 786004, India
| | | | - Yukio Kawashima
- RIKEN Advanced Institute for Computational Science, Kobe, Hyogo 6500047, Japan
| | - Kimihiko Hirao
- RIKEN Advanced Institute for Computational Science, Kobe, Hyogo 6500047, Japan
| | - Rahul Kar
- Department of Chemistry, Dibrugarh University, Dibrugarh, Assam 786004, India
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16
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Rajan VK, Muraleedharan K. A computational investigation on the structure, global parameters and antioxidant capacity of a polyphenol, Gallic acid. Food Chem 2016; 220:93-99. [PMID: 27855941 DOI: 10.1016/j.foodchem.2016.09.178] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 08/29/2016] [Accepted: 09/28/2016] [Indexed: 02/09/2023]
Abstract
A computational DFT-B3LYP structural analysis of a poly phenol, Gallic acid (GA) has been performed by using 6-311++ G (df, p) basis set. The GA is a relatively stable molecule with considerable radical scavenging capacity. It is a well known antioxidant. The NBO analysis shows that the aromatic system is delocalized. The results reveal that the most stable radical is formed at O3-atom upon scavenging the free radicals. Global descriptive parameters show that GA acts as an acceptor center in charge transfer complex formation which is supported by ESP and contour diagrams and also by Qmax value. The GA is a good antioxidant and it can be better understood by HAT and TMC mechanisms as it has low BDE, ΔHacidity and ΔGacidity values. The ΔBDE and ΔAIP values also confirm that the antioxidant capacity of GA can be explained through HAT rather than the SET-PT mechanism.
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Affiliation(s)
- Vijisha K Rajan
- Department of Chemistry, University of Calicut, Malappuram 673635, India
| | - K Muraleedharan
- Department of Chemistry, University of Calicut, Malappuram 673635, India.
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17
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Borpuzari MP, Boruah A, Kar R. Ionisation potential theorem in the presence of the electric field: Assessment of range-separated functional in the reproduction of orbital and excitation energies. J Chem Phys 2016; 144:164113. [DOI: 10.1063/1.4947241] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
| | - Abhijit Boruah
- Department of Chemistry, Dibrugarh University, Dibrugarh, Assam 786004, India
| | - Rahul Kar
- Department of Chemistry, Dibrugarh University, Dibrugarh, Assam 786004, India
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18
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Deka BC, Bhattacharyya PK. Response of chitosan–nucleobase interaction toward external perturbations: A computational study. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2015.12.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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19
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BARUAH KUNDAN, BHATTACHARYYA PRADIPKR. Effect of external electric field on Cyclodextrin-Alcohol adducts: A DFT study. J CHEM SCI 2015. [DOI: 10.1007/s12039-015-0875-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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20
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Abstract
Ionic liquids (IL) and hydrogen bonding (H-bonding) are two diverse fields for which there is a developing recognition of significant overlap. Doubly ionic H-bonds occur when a H-bond forms between a cation and anion, and are a key feature of ILs. Doubly ionic H-bonds represent a wide area of H-bonding which has yet to be fully recognised, characterised or explored. H-bonds in ILs (both protic and aprotic) are bifurcated and chelating, and unlike many molecular liquids a significant variety of distinct H-bonds are formed between different types and numbers of donor and acceptor sites within a given IL. Traditional more neutral H-bonds can also be formed in functionalised ILs, adding a further level of complexity. Ab initio computed parameters; association energies, partial charges, density descriptors as encompassed by the QTAIM methodology (ρBCP), qualitative molecular orbital theory and NBO analysis provide established and robust mechanisms for understanding and interpreting traditional neutral and ionic H-bonds. In this review the applicability and extension of these parameters to describe and quantify the doubly ionic H-bond has been explored. Estimating the H-bonding energy is difficult because at a fundamental level the H-bond and ionic interaction are coupled. The NBO and QTAIM methodologies, unlike the total energy, are local descriptors and therefore can be used to directly compare neutral, ionic and doubly ionic H-bonds. The charged nature of the ions influences the ionic characteristics of the H-bond and vice versa, in addition the close association of the ions leads to enhanced orbital overlap and covalent contributions. The charge on the ions raises the energy of the Ylp and lowers the energy of the X-H σ* NBOs resulting in greater charge transfer, strengthening the H-bond. Using this range of parameters and comparing doubly ionic H-bonds to more traditional neutral and ionic H-bonds it is clear that doubly ionic H-bonds cover the full range of weak through to very strong H-bonds.
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Affiliation(s)
- Patricia A Hunt
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, London, SW7 2AZ, UK.
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21
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Bhattacharyya PK. Effect of external electric field on ground and singlet excited states of phenylalanine: A theoretical study. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.01.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Borpuzari MP, Rohman R, Kar R. Antioxidant properties can be tuned in the presence of an external electric field: accurate computation of O–H BDE with range-separated density functionals. RSC Adv 2015. [DOI: 10.1039/c5ra13462e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The effect of external electric field on the antioxidant properties of gallic and caffeic acids is studied. The performance of range-separated functionals in reproducing the O–H BDE is tested in the presence of an external electric field.
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Affiliation(s)
| | - Rakiba Rohman
- Department of Chemistry
- Dibrugarh University
- Dibrugarh
- India-786004
| | - Rahul Kar
- Department of Chemistry
- Dibrugarh University
- Dibrugarh
- India-786004
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23
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Dutta BJ, Bhattacharyya PK. Reactivity and Aromaticity of Nucleobases are Sensitive Toward External Electric Field. J Phys Chem B 2014; 118:9573-82. [DOI: 10.1021/jp5047535] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Biswa Jyoti Dutta
- Department of Chemistry, Arya Vidyapeeth College, Guwahati, Assam 781016, India
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24
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25
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On the complementarity of comprehensive decomposition analysis of stabilization energy (CDASE) – Scheme and supermolecular approach. Chem Phys 2012. [DOI: 10.1016/j.chemphys.2011.12.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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26
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Neog B, Sarmah N, Kar R, Bhattacharyya PK. Effect of external electric field on aziridinium ion intermediate: A DFT study. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.08.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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27
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Sarmah N, Neog B, Bhattacharyya PK. Affinity of aziridinium ion towards different nucleophiles: A density functional study. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.07.034] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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28
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29
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Saha S, Roy RK, Pal S. CDASE—A reliable scheme to explain the reactivity sequence between Diels–Alder pairs. Phys Chem Chem Phys 2010; 12:9328-38. [DOI: 10.1039/b925441b] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Krishtal A, Senet P, Van Alsenoy C. Local softness, softness dipole, and polarizabilities of functional groups: Application to the side chains of the 20 amino acids. J Chem Phys 2009; 131:044312. [DOI: 10.1063/1.3185349] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Bagaria P, Saha S, Murru S, Kavala V, Patel BK, Roy RK. A comprehensive decomposition analysis of stabilization energy (CDASE) and its application in locating the rate-determining step of multi-step reactions. Phys Chem Chem Phys 2009; 11:8306-15. [DOI: 10.1039/b902335f] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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33
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Torrent-Sucarrat M, Salvador P, Solà M, Geerlings P. The hardness kernel as the basis for global and local reactivity indices. J Comput Chem 2008; 29:1064-72. [DOI: 10.1002/jcc.20866] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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34
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Gupta N, Garg R, Shah KK, Tanwar A, Pal S. Deprotonation of 1,2-Dialkylpyridinium Ions: A DFT Study of Reactivity and Site Selectivity. J Phys Chem A 2007; 111:8823-8. [PMID: 17705354 DOI: 10.1021/jp072812o] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A site-selectivity model, based on the Fukui function as a local reactivity descriptor, has been applied to 1,2-disubstituted pyridinium ions incorporating two competing sites of similar reactivity, i.e., 1-methylene and 2-methylene, which may undergo deprotonation depending on the nature of substituent present on these moieties. Applicability of the local HSAB rule, in context with the Li-Evans' generalized HSAB principle suggesting the hard-hard interactions to be controlled by minimum Fukui function, has been illustrated. Global and local reactivity descriptors have been computed by carrying out DFT calculations at B3LYP/6-31++G** level using Mulliken and NPA methods for charge analysis. A comparison with the calculated deprotonation energies involving two sites indicates that the observed site selectivity in differently substituted pyridinium ions is better explained by the Li-Evans rule of minimum Fukui function for hard-hard interactions.
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Affiliation(s)
- Neelima Gupta
- Department of Chemistry, University of Rajasthan, Jaipur-302 004, India.
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