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Patel AK, Jadeja RN, Butcher R, Kesharwani MK, Kästner J, Muddassir M. New copper(II) complexes with (Z)-N′-{(2-hydroxynaphthalen-1-yl}methylene)acetohydrazide]: X-ray structure, Hirshfeld analysis, X-band electron paramagnetic resonance spectra, TD-DFT calculations and superoxide dismutase mimetic activity. Polyhedron 2021. [DOI: 10.1016/j.poly.2020.114969] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Benedikter M, Musso J, Kesharwani MK, Sterz KL, Elser I, Ziegler F, Fischer F, Plietker B, Frey W, Kästner J, Winkler M, van Slageren J, Nowakowski M, Bauer M, Buchmeiser MR. Charge Distribution in Cationic Molybdenum Imido Alkylidene N-Heterocyclic Carbene Complexes: A Combined X-ray, XAS, XES, DFT, Mössbauer, and Catalysis Approach. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03978] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Mathis Benedikter
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Janis Musso
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Manoj K. Kesharwani
- Institute of Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - K. Leonard Sterz
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Iris Elser
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Felix Ziegler
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Felix Fischer
- Faculty of Chemistry and Food Chemistry, Technical University of Dresden, Bergstrasse 66, D-01069 Dresden, Germany
| | - Bernd Plietker
- Faculty of Chemistry and Food Chemistry, Technical University of Dresden, Bergstrasse 66, D-01069 Dresden, Germany
| | - Wolfgang Frey
- Institute of Organic Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Johannes Kästner
- Institute of Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Mario Winkler
- Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Joris van Slageren
- Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Michal Nowakowski
- Department of Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany
| | - Matthias Bauer
- Department of Chemistry, University of Paderborn, Warburger Str. 100, D-33098 Paderborn, Germany
| | - Michael R. Buchmeiser
- Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
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Kesharwani MK, Elser I, Musso JV, Buchmeiser MR, Kästner J. Reaction Mechanism of Ring-Closing Metathesis with a Cationic Molybdenum Imido Alkylidene N-Heterocyclic Carbene Catalyst. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kesharwani MK, Sylvetsky N, Köhn A, Tew DP, Martin JML. Do CCSD and approximate CCSD-F12 variants converge to the same basis set limits? The case of atomization energies. J Chem Phys 2018; 149:154109. [PMID: 30342453 DOI: 10.1063/1.5048665] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
While the title question is a clear "yes" from purely theoretical arguments, the case is less clear for practical calculations with finite (one-particle) basis sets. To shed further light on this issue, the convergence to the basis set limit of CCSD (coupled cluster theory with all single and double excitations) and of different approximate implementations of CCSD-F12 (explicitly correlated CCSD) has been investigated in detail for the W4-17 thermochemical benchmark. Near the CBS ([1-particle] complete basis set) limit, CCSD and CCSD(F12*) agree to within their respective uncertainties (about ±0.04 kcal/mol) due to residual basis set incompleteness error, but a nontrivial difference remains between CCSD-F12b and CCSD(F12*), which is roughly proportional to the degree of static correlation. The observed basis set convergence behavior results from the superposition of a rapidly converging, attractive, CCSD[F12]-CCSD-F12b difference (consisting mostly of third-order terms) and a more slowly converging, repulsive, fourth-order difference between CCSD(F12*) and CCSD[F12]. For accurate thermochemistry, we recommend CCSD(F12*) over CCSD-F12b if at all possible. There are some indications that the nZaPa family of basis sets exhibits somewhat smoother convergence than the correlation consistent family.
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Affiliation(s)
- Manoj K Kesharwani
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Nitai Sylvetsky
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Andreas Köhn
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - David P Tew
- Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany
| | - Jan M L Martin
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
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Kesharwani MK, Manna D, Sylvetsky N, Martin JML. The X40×10 Halogen Bonding Benchmark Revisited: Surprising Importance of (n–1)d Subvalence Correlation. J Phys Chem A 2018; 122:2184-2197. [DOI: 10.1021/acs.jpca.7b10958] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manoj K. Kesharwani
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Debashree Manna
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Nitai Sylvetsky
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Jan M. L. Martin
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
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Kesharwani MK, Karton A, Sylvetsky N, Martin JML. The S66 Non-Covalent Interactions Benchmark Reconsidered Using Explicitly Correlated Methods Near the Basis Set Limit. Aust J Chem 2018. [DOI: 10.1071/ch17588] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The S66 benchmark for non-covalent interactions has been re-evaluated using explicitly correlated methods with basis sets near the one-particle basis set limit. It is found that post-MP2 ‘high-level corrections’ are treated adequately well using a combination of CCSD(F12*) with (aug-)cc-pVTZ-F12 basis sets on the one hand, and (T) extrapolated from conventional CCSD(T)/heavy-aug-cc-pV{D,T}Z on the other hand. Implications for earlier benchmarks on the larger S66×8 problem set in particular, and for accurate calculations on non-covalent interactions in general, are discussed. At a slight cost in accuracy, (T) can be considerably accelerated by using sano-V{D,T}Z+ basis sets, whereas half-counterpoise CCSD(F12*)(T)/cc-pVDZ-F12 offers the best compromise between accuracy and computational cost.
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Sylvetsky N, Kesharwani MK, Martin JML. The aug-cc-pVnZ-F12 basis set family: Correlation consistent basis sets for explicitly correlated benchmark calculations on anions and noncovalent complexes. J Chem Phys 2017; 147:134106. [DOI: 10.1063/1.4998332] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Nitai Sylvetsky
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Manoj K. Kesharwani
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Jan M. L. Martin
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
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Manna D, Kesharwani MK, Sylvetsky N, Martin JML. Conventional and Explicitly Correlated ab Initio Benchmark Study on Water Clusters: Revision of the BEGDB and WATER27 Data Sets. J Chem Theory Comput 2017; 13:3136-3152. [DOI: 10.1021/acs.jctc.6b01046] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Debashree Manna
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rechovot, Israel
| | - Manoj K. Kesharwani
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rechovot, Israel
| | - Nitai Sylvetsky
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rechovot, Israel
| | - Jan M. L. Martin
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Rechovot, Israel
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Liakos DG, Sparta M, Kesharwani MK, Martin JML, Neese F. Exploring the Accuracy Limits of Local Pair Natural Orbital Coupled-Cluster Theory. J Chem Theory Comput 2016; 11:1525-39. [PMID: 26889511 DOI: 10.1021/ct501129s] [Citation(s) in RCA: 460] [Impact Index Per Article: 57.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The domain based local pair natural orbital coupled cluster method with single-, double-, and perturbative triple excitations (DLPNO–CCSD(T)) is an efficient quantum chemical method that allows for coupled cluster calculations on molecules with hundreds of atoms. Because coupled-cluster theory is the method of choice if high-accuracy is needed, DLPNO–CCSD(T) is very promising for large-scale chemical application. However, the various approximations that have to be introduced in order to reach near linear scaling also introduce limited deviations from the canonical results. In the present work, we investigate how far the accuracy of the DLPNO–CCSD(T) method can be pushed for chemical applications. We also address the question at which additional computational cost improvements, relative to the previously established default scheme, come. To answer these questions, a series of benchmark sets covering a broad range of quantum chemical applications including reaction energies, hydrogen bonds, and other noncovalent interactions, conformer energies, and a prototype organometallic problem were selected. An accuracy of 1 kcal/mol or better can readily be obtained for all data sets using the default truncation scheme, which corresponds to the stated goal of the original implementation. Tightening of the three thresholds that control DLPNO leads to mean absolute errors and standard deviations from the canonical results of less than 0.25 kcal/mol (<1 kJ/mol). The price one has then to pay is an increased computational time by a factor close to 3. The applicability of the method is shown to be independent of the nature of the reaction. On the basis of the careful analysis of the results, three different sets of truncation thresholds (termed “LoosePNO”, “NormalPNO”, and “TightPNO”) have been chosen for “black box” use of DLPNO–CCSD(T). This will allow users of the method to optimally balance performance and accuracy.
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Brauer B, Kesharwani MK, Kozuch S, Martin JML. The S66x8 benchmark for noncovalent interactions revisited: explicitly correlated ab initio methods and density functional theory. Phys Chem Chem Phys 2016; 18:20905-25. [DOI: 10.1039/c6cp00688d] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The S66x8 dataset for noncovalent interactions of biochemical relevance has been re-examined by means of CCSD(F12*)(T), DFT, and SAPT methods.
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Affiliation(s)
- Brina Brauer
- Department of Organic Chemistry
- Weizmann Institute of Science
- 76100 Rehovot
- Israel
| | - Manoj K. Kesharwani
- Department of Organic Chemistry
- Weizmann Institute of Science
- 76100 Rehovot
- Israel
| | - Sebastian Kozuch
- Department of Chemistry
- Ben-Gurion University of the Negev
- 84105 Beer-Sheva
- Israel
| | - Jan M. L. Martin
- Department of Organic Chemistry
- Weizmann Institute of Science
- 76100 Rehovot
- Israel
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11
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Kesharwani MK, Karton A, Martin JML. Benchmark ab Initio Conformational Energies for the Proteinogenic Amino Acids through Explicitly Correlated Methods. Assessment of Density Functional Methods. J Chem Theory Comput 2015; 12:444-54. [DOI: 10.1021/acs.jctc.5b01066] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manoj K. Kesharwani
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Amir Karton
- School
of Chemistry and Biochemistry, The University of Western Australia, Perth, WA 6009, Australia
| | - Jan M. L. Martin
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
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12
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Kesharwani MK, Kozuch S, Martin JML. Comment on “Doubly hybrid density functional xDH-PBE0 from a parameter-free global hybrid model PBE0” [J. Chem. Phys. 136, 174103 (2012)]. J Chem Phys 2015; 143:187101; discussion 187102. [DOI: 10.1063/1.4934819] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Manoj K. Kesharwani
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Sebastian Kozuch
- Department of Chemistry, Ben-Gurion University of the Negev, 84105 Beer Sheva, Israel
| | - Jan M. L. Martin
- Department of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
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Chandar NB, Lo R, Kesharwani MK, Ganguly B. In silico study on aging and reactivation processes of tabun conjugated AChE. Med Chem Commun 2015. [DOI: 10.1039/c4md00497c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study revealed that the reactivation of tabun inhibited AChE is feasible with neutral antidotes prior to the aging process.
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Affiliation(s)
- Nellore Bhanu Chandar
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility)
- CSIR-Central Salt & Marine Chemicals Research Institute
- Bhavnagar
- India-364 002
- Academy of Scientific and Innovative Research
| | - Rabindranath Lo
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility)
- CSIR-Central Salt & Marine Chemicals Research Institute
- Bhavnagar
- India-364 002
| | - Manoj K. Kesharwani
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility)
- CSIR-Central Salt & Marine Chemicals Research Institute
- Bhavnagar
- India-364 002
| | - Bishwajit Ganguly
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility)
- CSIR-Central Salt & Marine Chemicals Research Institute
- Bhavnagar
- India-364 002
- Academy of Scientific and Innovative Research
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Affiliation(s)
- Kirk A. Peterson
- Department of Chemistry, Washington State University, Pullman, WA, USA
| | - Manoj K. Kesharwani
- Department of Organic Chemistry, Weizmann Institute of Science, Reḥovot, Israel
| | - Jan M.L. Martin
- Department of Organic Chemistry, Weizmann Institute of Science, Reḥovot, Israel
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15
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Kesharwani MK, Brauer B, Martin JML. Frequency and Zero-Point Vibrational Energy Scale Factors for Double-Hybrid Density Functionals (and Other Selected Methods): Can Anharmonic Force Fields Be Avoided? J Phys Chem A 2014; 119:1701-14. [DOI: 10.1021/jp508422u] [Citation(s) in RCA: 349] [Impact Index Per Article: 34.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Manoj K. Kesharwani
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Brina Brauer
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
| | - Jan M. L. Martin
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Reḥovot, Israel
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16
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Sahu D, Kesharwani MK, Ganguly B. Origin of reversal of stereoselectivity for [4+2] cycloaddition reaction between cyclopentadiene and methyl methacrylate in the presence of the chloroloaluminate ionic liquid (1-ethyl-3-methyl-imidazolium chloride): in silico studies. CAN J CHEM 2014. [DOI: 10.1139/cjc-2014-0189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The origin of stereoselectivity for [4+2] cycloaddition reaction of methyl methacrylate with cyclopentadiene was investigated with the B3LYP-D3(BJ)/6-31+G(d)//B3LYP/6-31+G(d) level of theory in the presence of the ionic liquid 1-ethyl-3-methyl-imidazolium chloride (EMI+Cl–) and its acidic chloroaluminate melt, 1-ethyl-3-methyl-imidazolium heptachlorodialuminate (EMI+Al2Cl7–). The reaction of methyl methacrylate with cyclopentadiene was examined in the gas phase to rationalize the effect of the ionic liquid ion pairs EMI+Cl– and EMI+Al2Cl7–. The DFT calculated results were found to be in good agreement with the experimentally observed results. The much-discussed hydrogen bonding effect of the imidazolium cation with the dienophile is less important to govern the stereoselectivity for the cycloaddition reaction. The atoms in molecules theory was used to examine the role of hydrogen bonding between the EMI+ cation and methyl methacrylate in the transition state geometries. The calculated activation barriers with the M062X/6-31+G(d)//B3LYP/6-31+G(d) and MP2/6-311+G(d,p)//B3LYP/6-31+G(d) levels of theory also predict the similar exo/endo-stereoselectivity trend for the cycloaddition reactions.
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Affiliation(s)
- Debashis Sahu
- Computation and Simulation Unit, Analytical Discipline and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002
- Academy of Scientific and Innovative Research, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002
| | - Manoj K. Kesharwani
- Computation and Simulation Unit, Analytical Discipline and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002
| | - Bishwajit Ganguly
- Computation and Simulation Unit, Analytical Discipline and Centralized Instrument Facility, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002
- Academy of Scientific and Innovative Research, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002
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Brauer B, Kesharwani MK, Martin JML. Some Observations on Counterpoise Corrections for Explicitly Correlated Calculations on Noncovalent Interactions. J Chem Theory Comput 2014; 10:3791-9. [PMID: 26588524 DOI: 10.1021/ct500513b] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The basis set convergence of explicitly correlated ab initio methods, when applied to noncovalent interactions, has been considered in the presence (and absence) of Boys-Bernardi counterpoise corrections, as well as using "half-counterpoise" (the average of raw and counterpoise-corrected values) as recently advocated in this journal [Burns, L. A.; Marshall, M. S.; Sherrill, C. D. J. Chem. Theory Comput. 2014, 10, 49-57]. Reference results were obtained using basis sets so large that BSSE (basis set superposition error) can be shown to be negligible. For the HF+CABS component, full counterpoise unequivocally exhibits the fastest basis set convergence. However, at the MP2-F12 and CCSD(T*)-F12b levels, surprisingly good uncorrected results can be obtained with small basis sets like cc-pVDZ-F12, owing to error compensation between basis set superposition error (which overbinds) and intrinsic basis set insufficiency (which underbinds). For intermediate sets like cc-pVTZ-F12, "half-half" averages work best, while for large basis sets like cc-pVQZ-F12, full counterpoise may be preferred but BSSE in uncorrected values is tolerably small for most purposes. A composite scheme in which CCSD(T)-MP2 "high level corrections" obtained at the CCSD(T*)-F12b/cc-pVDZ-F12 level are combined with "half-counterpoise" MP2-F12/cc-pVTZ-F12 interaction energies yields surprisingly good performance for standard benchmark sets like S22 and S66.
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Affiliation(s)
- Brina Brauer
- Department of Organic Chemistry, Weizmann Institute of Science , 76100 Reḥovot, Israel
| | - Manoj K Kesharwani
- Department of Organic Chemistry, Weizmann Institute of Science , 76100 Reḥovot, Israel
| | - Jan M L Martin
- Department of Organic Chemistry, Weizmann Institute of Science , 76100 Reḥovot, Israel
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18
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Martin JML, Kesharwani MK. Assessment of CCSD(T)-F12 Approximations and Basis Sets for Harmonic Vibrational Frequencies. J Chem Theory Comput 2014; 10:2085-90. [DOI: 10.1021/ct500174q] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jan M. L. Martin
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Reh̲ovot, Israel
| | - Manoj K. Kesharwani
- Department
of Organic Chemistry, Weizmann Institute of Science, 76100 Reh̲ovot, Israel
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19
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Karton A, Yu LJ, Kesharwani MK, Martin JML. Heats of formation of the amino acids re-examined by means of W1-F12 and W2-F12 theories. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1483-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Agarwalla H, Jana K, Maity A, Kesharwani MK, Ganguly B, Das A. Hydrogen bonding interaction between active methylene hydrogen atoms and an anion as a binding motif for anion recognition: experimental studies and theoretical rationalization. J Phys Chem A 2014; 118:2656-66. [PMID: 24646313 DOI: 10.1021/jp501769y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Two new reagents, having similar spatial arrangements for hydrogen atoms of the active methylene functionalities, were synthesized and interactions of such reagents with different anionic analytes were studied using electronic spectroscopy as well as by using (1)H and (31)P NMR spectroscopic methods. Experimental studies revealed that these two reagents showed preference for binding to F(-) and OAc(-). Detailed theoretical studies along with the above-mentioned spectroscopic studies were carried out to understand the contribution of the positively charged phosphonium ion, along with methylene functionality, in achieving the observed preference of these two receptors for binding to F(-) and OAc(-). Observed differences in the binding affinities of these two reagents toward fluoride and acetate ions also reflected the role of acidity of such methylene hydrogen atoms in controlling the efficiencies of the hydrogen bonding in anion-Hmethylene interactions. Hydrogen bonding interactions at lower concentrations of these two anionic analytes and deprotonation equilibrium at higher concentration were observed with associated electronic spectral changes as well as visually detectable change in solution color, an observation that is generally common for other strong hydrogen bond donor functionalities like urea and thiourea. DFT calculations performed with the M06/6-31+G**//M05-2X/6-31G* level of theory showed that F(-) binds more strongly than OAc(-) with the reagent molecules. The deprotonation of methylene hydrogen atom of receptors with F(-) ion was observed computationally. The metal complex as reagent showed even stronger binding energies with these analytes, which corroborated the experimental results.
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Affiliation(s)
- Hridesh Agarwalla
- Organic Chemistry Division, CSIR-National Chemical Laboratory , Pune 411008, Maharashtra, India
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21
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Gunupuru R, Kesharwani MK, Chakraborty A, Ganguly B, Paul P. Dipicrylamine as a colorimetric sensor for anions: experimental and computational study. RSC Adv 2014. [DOI: 10.1039/c4ra09099c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Dipicrylamine exhibited colorimetric sensing of F−, OAc− and H2PO4−, detectable by bared-eye, out of a large number of anions. Interestingly, F− binds with one of the phenyl carbon of dipicrylamine.
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Affiliation(s)
- Ravi Gunupuru
- Analytical Discipline and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-CSMCRI
| | - Manoj K. Kesharwani
- Analytical Discipline and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar 364002, India
| | - Ashish Chakraborty
- Analytical Discipline and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar 364002, India
| | - Bishwajit Ganguly
- Analytical Discipline and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-CSMCRI
| | - Parimal Paul
- Analytical Discipline and Centralized Instrument Facility
- CSIR-Central Salt and Marine Chemicals Research Institute
- Bhavnagar 364002, India
- Academy of Scientific and Innovative Research (AcSIR)
- CSIR-CSMCRI
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Lo R, Chandar NB, Kesharwani MK, Jain A, Ganguly B. In silico studies in probing the role of kinetic and structural effects of different drugs for the reactivation of tabun-inhibited AChE. PLoS One 2013; 8:e79591. [PMID: 24312449 PMCID: PMC3846473 DOI: 10.1371/journal.pone.0079591] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Accepted: 09/27/2013] [Indexed: 11/24/2022] Open
Abstract
We have examined the reactivation mechanism of the tabun-conjugated AChE with various drugs using density functional theory (DFT) and post-Hartree-Fock methods. The electronic environments and structural features of neutral oximes (deazapralidoxime and 3-hydroxy-2-pyridinealdoxime) and charged monopyridinium oxime (2-PAM) and bispyridinium oxime (Ortho-7) are different, hence their efficacy varies towards the reactivation process of tabun-conjugated AChE. The calculated potential energy surfaces suggest that a monopyridinium reactivator is less favorable for the reactivation of tabun-inhibited AChE compared to a bis-quaternary reactivator, which substantiates the experimental study. The rate determining barrier with neutral oximes was found to be ∼2.5 kcal/mol, which was ∼5.0 kcal/mol lower than charged oxime drugs such as Ortho-7. The structural analysis of the calculated geometries suggest that the charged oximes form strong O…H and N…H hydrogen bonding and C-H…π non-bonding interaction with the tabun-inhibited enzyme to stabilize the reactant complex compared to separated reactants, which influences the activation barrier. The ability of neutral drugs to cross the blood-brain barrier was also found to be superior to charged antidotes, which corroborates the available experimental observations. The calculated activation barriers support the superiority of neutral oximes for the activation of tabun-inhibited AChE compared to charged oximes. However, they lack effective interactions with their peripheral sites. Docking studies revealed that the poor binding affinity of simple neutral oxime drugs such as 3-hydroxy-2-pyridinealdoxime inside the active-site gorge of AChE was significantly augmented with the addition of neutral peripheral units compared to conventional charged peripheral sites. The newly designed oxime drug 2 appears to be an attractive candidate as efficient antidote to kinetically and structurally reactivate the tabun-inhibited enzyme.
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Affiliation(s)
- Rabindranath Lo
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Nellore Bhanu Chandar
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
- Academy of Scientific and Innovative Research, CSIR-CSMCRI, Bhavnagar, Gujarat, India
| | - Manoj K. Kesharwani
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Aastha Jain
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
| | - Bishwajit Ganguly
- Computation and Simulation Unit (Analytical Discipline and Centralized Instrument Facility), CSIR-Central Salt & Marine Chemicals Research Institute, Bhavnagar, Gujarat, India
- Academy of Scientific and Innovative Research, CSIR-CSMCRI, Bhavnagar, Gujarat, India
- * E-mail:
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Ganguly B, Kesharwani MK, Basarić N, Suresh E, Biswas AK, Mlinarić-Majerski K. Conformational preference of glycinamide in solution: an answer derived from combined experimental and computational studies. J Mol Graph Model 2013; 46:52-8. [PMID: 24141079 DOI: 10.1016/j.jmgm.2013.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 08/14/2013] [Accepted: 09/11/2013] [Indexed: 10/26/2022]
Abstract
Conformational problems are often subtle but very important in controlling many intricate features in chemistry and biochemistry. We have performed the conformational analysis of glycinamide using NMR experiments and computational studies. (1)H NMR experiments suggest the prevalence of intramolecular hydrogen bonded conformation of glycinamide (2B) in acetonitrile, whereas, non-intramolecular hydrogen bonded conformation 2A is favoured in dimethylsulfoxide. The NOESY experiments carried out for glycinamide in DMSO-d6, showed stronger NOE interaction of the NHa-atom of amide group with CH2 than that of NHb-atom confirming the presence of conformer 2A. DFT calculations performed with explicit DMSO molecules also suggested a clear preference for the conformer 2A. The molecular dynamics simulations performed with the explicit DMSO molecules also showed that the intermolecular hydrogen bonding exists between the solvent and solute molecules to stabilize the conformer 2A. The present study sheds light on the debate of conformational preference of neutral glycinamide in the present literature.
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Affiliation(s)
- Bishwajit Ganguly
- Analytical Discipline and Centralized Instrument Facility, Central Salt & Marine Chemicals Research Institute (Council of Scientific and Industrial Research) Bhavnagar, Gujarat 364 002, India.
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Mandal AK, Suresh M, Kesharwani MK, Gangopadhyay M, Agrawal M, Boricha VP, Ganguly B, Das A. Molecular Interactions, Proton Exchange, and Photoinduced Processes Prompted by an Inclusion Process and a [2]Pseudorotaxane Formation. J Org Chem 2013; 78:9004-12. [DOI: 10.1021/jo400752d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Amal Kumar Mandal
- CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India
| | - Moorthy Suresh
- CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India
| | - Manoj K. Kesharwani
- CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India
| | - Monalisa Gangopadhyay
- Organic Chemistry
Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Rd., Pune, Maharashtra 411008, India
- Academy of Scientific and Innovative Research, CSIR-National Chemical Laboratory, Pune, Maharashtra 411008, India
| | - Manoj Agrawal
- CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India
| | - Vinod P. Boricha
- CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India
| | - Bishwajit Ganguly
- CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India
- Academy of Scientific and Innovative Research, CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat 364002, India
| | - Amitava Das
- Organic Chemistry
Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Rd., Pune, Maharashtra 411008, India
- Academy of Scientific and Innovative Research, CSIR-National Chemical Laboratory, Pune, Maharashtra 411008, India
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Kesharwani MK, Sahu D, Desai K, Ganguly B. In silico studies toward the recognition of fluoride ion by novel bicyclic diborane receptors and tuning through remote substituent effects. Theor Chem Acc 2013. [DOI: 10.1007/s00214-013-1358-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Kesharwani MK, Ganguly B. In silico studies toward the recognition of fluoride ion by substituted borazines. J Mol Graph Model 2012; 38:363-8. [PMID: 23085176 DOI: 10.1016/j.jmgm.2012.06.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 06/13/2012] [Accepted: 06/15/2012] [Indexed: 11/26/2022]
Abstract
The substituted borazines have been computationally investigated as new type of receptors for the recognition of fluoride ion. Fluorine, methyl and phenyl groups have been selected as electron-withdrawing, electron-releasing and aromatic substituents for the study employing DFT (B3LYP/6-311+G**) and ab initio (MP2/6-311+G**) levels of calculations. N-substituted borazines have shown higher fluoride ion affinity than their corresponding B-substituted borazines. In the case of fluorinated borazines, the binding affinity of fluoride is enhanced with the increasing number of substitutions. The F⁻ and Cl⁻ ions, generally, prefer to bind with the boron atom of substituted borazine rings, whereas, Br⁻ ion prefers to bind with NH hydrogens of the borazine receptor units. Phenyl derivatives of borazine also showed analogous behavior with halide anions. The binding affinities of halides with fluorinated and phenyl derivatives of borazine have been found to be much higher than the simple borazine receptor molecule. The NBO analyses performed for the complexation of F⁻ ion with fluorinated borazines suggest that the Lewis energy contribution in the total SCF energy enhanced with increasing the substitutions. However, in the case of methylated borazines, the delocalization energy is responsible for the stabilization of F⁻ ion complexes. The N-trifluoroborazine showed much higher fluoride ion affinity (30.9 kcal/mol) in aqueous phase than the simple borazine.
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Affiliation(s)
- Manoj K Kesharwani
- Analytical Science Discipline, Central Salt and Marine Chemicals Research Institute-Council of Scientific and Industrial Research, Bhavnagar, Gujarat 364002, India
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Mahato P, Saha S, Suresh E, Di Liddo R, Parnigotto PP, Conconi MT, Kesharwani MK, Ganguly B, Das A. Ratiometric detection of Cr3+ and Hg2+ by a naphthalimide-rhodamine based fluorescent probe. Inorg Chem 2012; 51:1769-77. [PMID: 22235801 DOI: 10.1021/ic202073q] [Citation(s) in RCA: 208] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Newly synthesized rhodamine derivatives, L(1) and L(2), are found to bind specifically to Hg(2+) or Cr(3+) in presence of large excess of other competing ions with associated changes in their optical and fluorescence spectral behavior. These spectral changes are significant enough in the visible region of the spectrum and thus, allow the visual detection. For L(1), the detection limit is even lower than the permissible [Cr(3+)] or [Hg(2+)] in drinking water as per standard U.S. EPA norms; while the receptor, L2 could be used as a ratiometric sensor for detection of Cr(3+) and Hg(2+) based on the resonance energy transfer (RET) process involving the donor naphthalimide and the acceptor Cr(3+)/Hg(2+)-bound xanthene fragment. Studies reveal that these two reagents could be used for recognition and sensing of Hg(2+)/Cr(3+). Further, confocal laser microscopic studies confirmed that the reagent L(2) could also be used as an imaging probe for detection of uptake of these ions in A431 cells.
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Affiliation(s)
- Prasenjit Mahato
- Central Salt and Marine Chemicals Research Institute (CSIR), Bhavnagar-364002, Gujarat, India
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Das P, Kesharwani MK, Mandal AK, Suresh E, Ganguly B, Das A. An alternative approach: a highly selective dual responding fluoride sensor having active methylene group as binding site. Org Biomol Chem 2012; 10:2263-71. [DOI: 10.1039/c2ob06815j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lo R, Singh A, Kesharwani MK, Ganguly B. Rational design of a new class of polycyclic organic bases bearing two superbasic sites and their applications in the CO2 capture and activation process. Chem Commun (Camb) 2012; 48:5865-7. [DOI: 10.1039/c2cc18083a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Das P, Ghosh A, Kesharwani MK, Ramu V, Ganguly B, Das A. ZnII-2,2′:6′,2″-Terpyridine-Based Complex as Fluorescent Chemosensor for PPi, AMP and ADP. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100125] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kesharwani MK, Ganguly B. Probing the structural and electronic effects to stabilize nonplanar forms of thioamide derivatives: A computational study. J Comput Chem 2011; 32:2170-6. [DOI: 10.1002/jcc.21800] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2010] [Revised: 02/03/2011] [Accepted: 03/04/2011] [Indexed: 11/05/2022]
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Das P, Mandal AK, Kesharwani MK, Suresh E, Ganguly B, Das A. Receptor design and extraction of inorganic fluoride ion from aqueous medium. Chem Commun (Camb) 2011; 47:7398-400. [DOI: 10.1039/c1cc11458a] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ganguly B, Kesharwani MK, Matković M, Basarić N, Singh A, Mlinarić-Majerski K. Hydrolysis and retro-aldol cleavage of ethyl threo-2-(1-adamantyl)-3-hydroxybutyrate: competing reactions. J PHYS ORG CHEM 2010. [DOI: 10.1002/poc.1793] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kesharwani MK, Thiel W, Ganguly B. Probing the Influence of Anomeric Effects on the Lithium Ion Affinity in 1,3-Diaza Systems: A Computational Study. J Phys Chem A 2010; 114:10684-93. [DOI: 10.1021/jp1043656] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Manoj K. Kesharwani
- Analytical Science Discipline, Central Salt & Marine Chemicals Research Institute (Council of Scientific and Industrial Research), Bhavnagar 364 002, Gujarat, India, and Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, D-45470, Mülheim an der Ruhr, Germany
| | - Walter Thiel
- Analytical Science Discipline, Central Salt & Marine Chemicals Research Institute (Council of Scientific and Industrial Research), Bhavnagar 364 002, Gujarat, India, and Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, D-45470, Mülheim an der Ruhr, Germany
| | - Bishwajit Ganguly
- Analytical Science Discipline, Central Salt & Marine Chemicals Research Institute (Council of Scientific and Industrial Research), Bhavnagar 364 002, Gujarat, India, and Max-Planck-Institut für Kohlenforschung, Kaiser Wilhelm-Platz 1, D-45470, Mülheim an der Ruhr, Germany
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Khan MAS, Kesharwani MK, Bandyopadhyay T, Ganguly B. Remarkable effect of hydroxylamine anion towards the solvolysis of sarin: A DFT study. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.theochem.2009.12.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Alešković M, Basarić N, Mlinarić-Majerski K, Molčanov K, Kojić-Prodić B, Kesharwani MK, Ganguly B. Anion recognition through hydrogen bonding by adamantane-dipyrromethane receptors. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.01.018] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Bhattacharya R, Kesharwani MK, Manna C, Ganguly B, Suresh CG, Pathak T. An Experimental and Theoretical Study on the Remarkable Influence of Protecting Groups on the Selectivity of Addition of Amines to Vinyl Sulfone-Modified Hex-2-enopyranosides. J Org Chem 2009; 75:303-14. [DOI: 10.1021/jo902046g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rahul Bhattacharya
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
| | - Manoj K. Kesharwani
- Analytical Science Discipline, Central Salt & Marine Chemicals Research Institute (CSIR), Bhavnagar 364 002, Gujarat, India
| | - Chinmoy Manna
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
| | - Bishwajit Ganguly
- Analytical Science Discipline, Central Salt & Marine Chemicals Research Institute (CSIR), Bhavnagar 364 002, Gujarat, India
| | | | - Tanmaya Pathak
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721 302, India
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Khan MAS, Kesharwani MK, Bandyopadhyay T, Ganguly B. Solvolysis of chemical warfare agent VX is more efficient with hydroxylamine anion: A computational study. J Mol Graph Model 2009; 28:177-82. [DOI: 10.1016/j.jmgm.2009.06.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2009] [Revised: 06/16/2009] [Accepted: 06/19/2009] [Indexed: 10/20/2022]
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Dadwal M, Kesharwani MK, Danayak V, Ganguly B, Mobin SM, Muruganantham R, Namboothiri INN. Synthetic and Theoretical Investigations on the Construction of Oxanorbornenes by a Michael Addition and Intramolecular Diels-Alder Furan Reaction. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800681] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Patel RN, Kesharwani MK, Singh A, Patel DK, Choudhary M. Syntheses, structures and electrochemical properties of complexes of nickel(II) with triethylenetetramine and bidentate nitrogen donor co-ligands. TRANSIT METAL CHEM 2008. [DOI: 10.1007/s11243-008-9104-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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