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Riefer A, Hackert-Oschätzchen M, Plänitz P, Meichsner G. Characterization of iron(III) in aqueous and alkaline environments with ab initio and ReaxFF potentials. J Chem Phys 2024; 160:082501. [PMID: 38411229 DOI: 10.1063/5.0182460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 02/05/2024] [Indexed: 02/28/2024] Open
Abstract
The iron(III) complexes [Fe(H2O)n(OH)m]3-m (n + m = 5, 6, m ≤ 3) and corresponding proton transfer reactions are studied with total energy calculations, the nudged elastic band (NEB) method, and molecular dynamics (MD) simulations using ab initio and a modification of reactive force field potentials, the ReaxFF-AQ potentials, based on the implementation according to Böhm et al. [J. Phys. Chem. C 120, 10849-10856 (2016)]. Applying ab initio potentials, the energies for the reactions [Fe(H2O)n(OH)m]3-m + H2O → [Fe(H2O)n-1(OH)m+1]2-m + H3O+ in a gaseous environment are in good agreement with comparable theoretical results. In an aqueous (aq) or alkaline environment, with the aid of NEB computations, respective minimum energy paths with energy barriers of up to 14.6 kcal/mol and a collective transfer of protons are modeled. Within MD simulations at room temperature, a permanent transfer of protons around the iron(III) ion is observed. The information gained concerning the geometrical and energetic properties of water and the [Fe(H2O)n(OH)m]3-m complexes from the ab initio computations has been used as reference data to optimize parameters for the O-H-Fe interaction within the ReaxFF-AQ approach. For the optimized ReaxFF-AQ parameter set, the statistical properties of the basic water model, such as the radial distribution functions and the proton hopping functions, are evaluated. For the [Fe(H2O)n(OH)m]3-m complexes, it was found that while geometrical and energetic properties are in good agreement with the ab initio data for gaseous environment, the statistical properties as obtained from the MD simulations are only partly in accordance with the ab initio results for the iron(III) complexes in aqueous or alkaline environments.
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Affiliation(s)
- Arthur Riefer
- Chair of Manufacturing Technology with Focus Machining, Institute of Manufacturing Technology and Quality Management (IFQ), Faculty of Mechanical Engineering, Otto von Guericke University Magdeburg, 39106 Magdeburg, Germany
| | - Matthias Hackert-Oschätzchen
- Chair of Manufacturing Technology with Focus Machining, Institute of Manufacturing Technology and Quality Management (IFQ), Faculty of Mechanical Engineering, Otto von Guericke University Magdeburg, 39106 Magdeburg, Germany
| | - Philipp Plänitz
- AQcomputare Gesellschaft für Materialberechnung mbH, 09125 Chemnitz, Germany
| | - Gunnar Meichsner
- Chair of Manufacturing Technology with Focus Machining, Institute of Manufacturing Technology and Quality Management (IFQ), Faculty of Mechanical Engineering, Otto von Guericke University Magdeburg, 39106 Magdeburg, Germany
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Boukar O, Fifen JJ, Conradie J, Conradie MM. Solvation energies of the ferrous ion in water and in ammonia at various temperatures. J Mol Model 2024; 30:52. [PMID: 38285315 DOI: 10.1007/s00894-024-05839-x] [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: 11/28/2023] [Accepted: 01/09/2024] [Indexed: 01/30/2024]
Abstract
CONTEXT The solvation of metal ions is crucial to understanding relevant properties in physics, chemistry, or biology. Therefore, we present solvation enthalpies and solvation free energies of the ferrous ion in water and ammonia. Our results agree well with the experimental reports for the hydration free energy and hydration enthalpy. We obtained [Formula: see text] kJ mol[Formula: see text] for the hydration free energy and [Formula: see text] kJ mol[Formula: see text] for the hydration enthalpy of ferrous ion in water at room temperature. At ambient temperature, we obtained [Formula: see text] kJ mol[Formula: see text] as the [Formula: see text] ammoniation free energy and [Formula: see text] kJ mol[Formula: see text] for the ammoniation enthalpy. In addition, the free energy of solvation is deeply affected when the temperature increases. This pattern can be attributed to the rise of entropy when the temperature rises. Besides, the temperature does not affect the ammoniation enthalpies and the hydration enthalpy of the [Formula: see text] ion. METHOD All the geometry optimizations are performed at the MP2 methods associated with the 6-31++g(d,p) basis set of Pople. solvated phase structures of [Formula: see text] ion in water or in ammonia are performed using the PCM model. The [Formula: see text] program suite was used to perform all the calculations. The program TEMPO was also used to evaluate the temperature sensitivity of the different obtained geometries.
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Affiliation(s)
- Ousman Boukar
- Department of Physics, Faculty of Science, University of Maroua, P.O. Box 46, Maroua, Cameroon.
| | - Jean Jules Fifen
- Quantum Theory and Aplications Unit, Department of Physics, Faculty of Science, The University of Ngaoundere, P.O. Box 454, Ngaoundere, Cameroon.
| | - Jeanet Conradie
- Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, 9300, South Africa
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3
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Karimadom BR, Meyerstein D, Kornweitz H. On The Nature of Fe IV =O aq in Aqueous Media: A DFT analysis. Chemphyschem 2023; 24:e202300508. [PMID: 37623820 DOI: 10.1002/cphc.202300508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 08/25/2023] [Accepted: 08/25/2023] [Indexed: 08/26/2023]
Abstract
FeIV =Oaq is a key intermediate in many advanced oxidation processes and probably in biological systems. It is usually referred to as FeIV =O2+ . The pKa's of FeIV =Oaq as derived by DFT are: pKa1=2.37 M06 L/6-311++G(d,p) (SDD for Fe) and pKa2=7.79 M06 L/6-311++G(d,p) (SDD for Fe). This means that in neutral solutions, FeIV =Oaq is a mixture of (H2 O)4 (OH)FeIV =O+ and (H2 O)2 (OH)2 FeIV =O. The oxidation potential of FeIV =Oaq in an acidic solution, E0 {(H2 O)5 FeIV =O2+ /FeIII (H2 O)6 3+ , pH 0.0} is calculated with and without a second solvation sphere and the recommended value is between 2.86 V (B3LYP/Def2-TZVP, with a second solvation sphere) and 2.23 V (M06 L/Def2-TZVP without a second solvation sphere). This means that FeIV =Oaq is the strongest oxidizing agent formed in systems involving FeVI O4 2- even in neutral media.
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Affiliation(s)
- Basil Raju Karimadom
- Chemical Science Department and The Radical Research Centre, Ariel University, P.O.B. 3, 40700, Ariel, Israel
| | - Dan Meyerstein
- Chemical Science Department and The Radical Research Centre, Ariel University, P.O.B. 3, 40700, Ariel, Israel
- Chemistry Department, Ben-Gurion University, 8410501, Beer-Sheva, Israel
| | - Haya Kornweitz
- Chemical Science Department and The Radical Research Centre, Ariel University, P.O.B. 3, 40700, Ariel, Israel
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4
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Das S, Mishra G, Halder D, Carlomagno I, Meneghini C, De Giudici G, Das B, Paul A, Aswal VK, Ray S. Curious Behavior of Fe 3+-As 3+ Chemical Interactions and Nucleation of Clusters in Aqueous Medium. Inorg Chem 2023; 62:11966-11975. [PMID: 37459483 DOI: 10.1021/acs.inorgchem.3c01387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
The simultaneous presence of Fe3+ and As3+ ions in groundwater (higher ppb or lower ppm level concentrations at circumneutral pH) as well as in acid mine drainages (AMDs)/industrial wastewater (up to few thousand ppm concentration at strongly acidic pH) are quite common. Therefore, understanding the chemical interactions prevalent between Fe3+ and As3+ ions in aqueous medium leading to nucleation of ionic clusters/solids, followed by aggregation and growth, is of great environmental significance. In the present work, we attempt to probe the nucleation process of Fe3+-As3+ clusters in solutions of various concentrations and pHs (from AMD to groundwater-like) using a combination of experimental and theoretical techniques. Interestingly, our study reveals nucleation of primary FeAs clusters in nearly all of them independent of concentration or pH. Theoretical studies employed density functional theory (DFT) to predict the primary clusters as stable Fe4As4 units. The surprising resemblance of these clusters with known Fe3+-As3+ minerals at the local level was observed experimentally, which provides an important clue about solid-phase growth from a range of Fe3+-As3+ solutions. Our experimental findings are further supported by a stepwise reaction mechanism established from detailed DFT studies.
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Affiliation(s)
- Sanjit Das
- School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Geetanjali Mishra
- School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Debabrata Halder
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Ilaria Carlomagno
- Dipartimento di Scienze, Universitá Roma Tre, Via della Vasca Navale, 84 I-00146 Roma, Italy
- XRF beamline - Elettra Sincrotrone Trieste, Area Science Park - S.S. 14, km 163.5, 34149 Basovizza (TS), Italy
| | - Carlo Meneghini
- Dipartimento di Scienze, Universitá Roma Tre, Via della Vasca Navale, 84 I-00146 Roma, Italy
| | - Giovanni De Giudici
- Department of Chemical and Geological Sciences, University of Cagliari, 09127 Cagliari, Italy
| | - Bidisa Das
- Research Institute for Sustainable Energy (RISE). TCG-CREST, Sector V, Kolkata 700091, India
| | - Ankan Paul
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Vinod K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sugata Ray
- School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Xu Q, Li Z, Liu F, You H, Xie B. Iron species activating chlorite: Neglected selective oxidation for water treatment. ENVIRONMENTAL SCIENCE AND ECOTECHNOLOGY 2023; 14:100225. [PMID: 36507056 PMCID: PMC9732127 DOI: 10.1016/j.ese.2022.100225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 11/13/2022] [Accepted: 11/14/2022] [Indexed: 06/17/2023]
Abstract
Chlorite (ClO2 -) is the by-product of the water treatment process carried out using chlorine dioxide (ClO2) as an effective disinfectant and oxidant; however, the reactivation of ClO2 - has commonly been overlooked. Herein, it was unprecedentedly found that ClO2 - could be activated by iron species (Feb: Fe0, FeII, or FeIII), which contributed to the synchronous removal of ClO2 - and selective oxidative treatment of organic contaminants. However, the above-mentioned activation process presented intensive H+-dependent reactivity. The introduction of Feb significantly shortened the autocatalysis process via the accumulation of Cl- or ClO- during the protonation of ClO2 - driven by ultrasonic field. Furthermore, it was found that the interdependent high-valent-Fe-oxo and ClO2, after identification, were the dominant active species for accelerating the oxidation process. Accordingly, the unified mechanisms based on coordination catalysis ([Fe N (H2O) a (ClO x m-) b ] n +-P) were putative, and this process was thus used to account for the pollutant removal by the Feb-activated protonated ClO2 -. This study pioneers the activation of ClO2 - for water treatment and provides a novel strategy for "waste treating waste". Derivatively, this activation process further provides the preparation methods for sulfones and ClO2, including the oriented oxidation of sulfoxides to sulfones and the production of ClO2 for on-site use.
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Affiliation(s)
- Qihui Xu
- State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Zhipeng Li
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China
| | - Feng Liu
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China
| | - Hong You
- State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin, 150090, China
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China
| | - Binghan Xie
- State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin, 150090, China
- School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, China
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6
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Esmaeilbeig M, Khorram M, Ayatollahi S, Zolghadr A. On the hydrolysis of iron ions: DFT-based molecular dynamics perspective. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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7
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A DFT study of the adsorption of O 2 and [Fe(H 2O) 2(OH) 3] on the (001) and (112) surfaces of chalcopyrite. J Mol Model 2022; 28:257. [PMID: 35974210 DOI: 10.1007/s00894-022-05263-z] [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: 05/27/2022] [Accepted: 08/01/2022] [Indexed: 10/15/2022]
Abstract
The oxidation of chalcopyrite, CuFeS2, is still not well understood and relevant in the context of the hydrometallurgical extraction of copper. Herein, we used DFT calculations within the periodic boundary conditions formalism to study the adsorption of O2 and [Fe(H2O)2(OH)3] molecules on the (001) and (112) surfaces of CuFeS2. The O2 molecule adsorbs strongly by a dissociative pathway at sulfur atoms on the (001) surface with an adsorption energy of - 76.5 kcal mol-1. The surface is chemically modified forming SO2 groups, in which the S-O bond length is calculated to be 1.47 and 1.54 Å. PDOS and Löwdin charges analyses indicate the oxidation of the sulfur atoms on the surface. We tested different adsorption modes of [Fe(H2O)2(OH)3], and a bidantade coordination with the Oads-Fesur and Feads-Ssur bond lengths of 2.02 and 2.47 Å is the most favorable with an adsorption energy of - 18.8 kcal mol-1 on the (001) surface. Adsorptions of each species are also observed on the (112) surface, but they are weaker than those observed on the (001) surface.
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8
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Iron ions chelation-based antioxidant potential vs. pro-oxidant risk of ferulic acid: A DFT study in aqueous phase. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112905] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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9
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Ahmed M, Hussein IA, Onawole AT, Saad MA. Development of a New Borax-Based Formulation for the Removal of Pyrite Scales. ACS OMEGA 2020; 5:14308-14315. [PMID: 32596568 PMCID: PMC7315426 DOI: 10.1021/acsomega.0c00556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 06/02/2020] [Indexed: 06/11/2023]
Abstract
In the oil and gas industry, pyrite forms one of the most hardened scales in reservoirs, which hinders the flow of fluids. Consequently, this leads to blockage of the downhole tubular, formation damage, and complete shutdown of production and operational processes. Herein, a new green formulation based on borax (K2B4O7) is proposed for pyrite scale removal. The temperature effect, disk rotational speed, and borax concentration have been investigated using a rotating disk apparatus. Also, XPS and SEM-EDX analyses were conducted on the pyrite disk surface before and after the treatment with the green formulation. The new formulation showed the potential ability to dissolve pyrite without generating the toxic hydrogen sulfide (H2S). The dissolution rate of the scale in the new formulation is increased by 16% compared to that in a previous green formulation composed of 20 wt %DTPA+9 wt % K2CO3. Molecular modeling technique using DFT was used to study the solvation energies of Fe2+ and Fe3+. The latter had a higher solvation energy than the former, which confirmed that upon using the borax-based formulation to oxidize Fe2+ to Fe3+. It will aid the dissolution of pyrite scales. The new formulation achieved a corrosion rate that is 25 times lower than that of 15 wt % HCl, which is commercially used in treating scales. Finally, the proposed new formulation does not require the use of corrosion inhibitors; hence, it is expected to result in a more economical scale treatment method.
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Affiliation(s)
- Musa Ahmed
- Gas
Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Ibnelwaleed A. Hussein
- Gas
Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Abdulmujeeb T. Onawole
- Gas
Processing Center, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
| | - Mohammed A. Saad
- Chemical
Engineering Department, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar
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10
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Tian M, Liu Y, Zhao W, Wang W, Wang L, Chen D, Zhao H, Meng F, Zhen Y, Qi T. Study on the grain size control of metatitanic acid in a mixture acid system based on Arrhenius and Boltzmann fitting. RSC Adv 2020; 10:1055-1065. [PMID: 35494473 PMCID: PMC9047982 DOI: 10.1039/c9ra08503c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 12/01/2019] [Indexed: 11/23/2022] Open
Abstract
Herein, to control the particle size of metatitanic acid produced via titanium thermal hydrolysis in sulfuric–chloric mixture acid (SCMA) solutions, the relationship between its grain size and hydrolysis parameters is discussed, and the corresponding mathematical model was established using the experimental data. Firstly, Ti(OH)(SO4)(Cl)(H2O)3 was selected as the most likely initial structure in the SCMA solution by comparing the experimental and corresponding simulated Raman spectra by density functional theory (DFT). Secondly, according to the predicted initial structure of TiO2+ and the experimental data for the hydrolysis process, with an increase in the concentration of TiO2+ and reaction temperature, the hydrolysis rate and grain size increased, while the agglomerate particle size decreased. Finally, a mathematic model was established and fitted by the Arrhenius equation and the Boltzmann distribution to describe the relationship between the grain size and hydrolysis parameters, as follows: Herein, to control the particle size of metatitanic acid produced via titanium thermal hydrolysis in sulfuric–chloric acid (SCMA) solutions, the relationship between its grain size and hydrolysis parameters are discussed, and the corresponding methematical model is discussed using the experimental data.![]()
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Affiliation(s)
- Ming Tian
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Yahui Liu
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Wei Zhao
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Weijing Wang
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Lina Wang
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Desheng Chen
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Hongxin Zhao
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Fancheng Meng
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Yulan Zhen
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
| | - Tao Qi
- National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering Beijing 100190 PR China .,University of Chinese Academy of Sciences Beijing 100190 PR China
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11
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Kuznetsov AM, Masliy AN, Korshin GV. Quantum-chemical simulations of the hydration of Pb(II) ion: structure, hydration energies, and pKa1 value. J Mol Model 2018; 24:193. [DOI: 10.1007/s00894-018-3726-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 06/18/2018] [Indexed: 10/28/2022]
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12
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Das B. Theoretical Study of Small Iron–Oxyhydroxide Clusters and Formation of Ferrihydrite. J Phys Chem A 2018; 122:652-661. [DOI: 10.1021/acs.jpca.7b09470] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bidisa Das
- Technical Research Centre, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, India
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13
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Yu D, Du R, Xiao JC, Xu S, Rong C, Liu S. Theoretical Study of pKa Values for Trivalent Rare-Earth Metal Cations in Aqueous Solution. J Phys Chem A 2018; 122:700-707. [DOI: 10.1021/acs.jpca.7b12074] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Donghai Yu
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic
Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
- Key
Laboratory of Chemical Biology and Traditional Chinese Medicine Research
(Ministry of Education of China), College of Chemistry and Chemical
Engineering, Hunan Normal University, Changsha, Hunan 410081, China
| | - Ruobing Du
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic
Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Ji-Chang Xiao
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic
Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Shengming Xu
- Institute
of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
| | - Chunying Rong
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic
Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Shubin Liu
- Research
Computing Center, University of North Carolina, Chapel Hill, North Carolina 27599-3420, United States
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14
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Mir JM, Vishwakarma PK, Maurya RC. Conjoint experimental–theoretical evaluation of pyrone-salicylic acid hydrazide copper(II) Schiff base complexes: their synthesis, SOD and electrochemical fronts. ACTA ACUST UNITED AC 2017. [DOI: 10.1080/22243682.2017.1407669] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- J. M. Mir
- Coordination, Metallopharmaceutical and Computational Chemistry Laboratory, Department of P. G. Studies and Research in Chemistry and Pharmacy, R. D. University, Jabalpur, India
| | - P. K. Vishwakarma
- Coordination, Metallopharmaceutical and Computational Chemistry Laboratory, Department of P. G. Studies and Research in Chemistry and Pharmacy, R. D. University, Jabalpur, India
| | - R. C. Maurya
- Coordination, Metallopharmaceutical and Computational Chemistry Laboratory, Department of P. G. Studies and Research in Chemistry and Pharmacy, R. D. University, Jabalpur, India
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15
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VISHWAKARMA PRADEEPKUMAR, MIR JANMOHAMMAD, MAURYA RAMCHARITRA. Pyrone-based Cu(II) complexes, their characterization, DFT based conformational drift from square planar to square pyramidal geometry and biological activities. J CHEM SCI 2016. [DOI: 10.1007/s12039-016-1048-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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de Noronha ALO, Guimarães L, Duarte HA. Structural and Thermodynamic Analysis of the First Mononuclear Aqueous Aluminum Citrate Complex Using DFT Calculations. J Chem Theory Comput 2015; 3:930-7. [PMID: 26627413 DOI: 10.1021/ct700016f] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Structural and thermodynamic properties of the mononuclear Al/citrate complexes have been theoretically investigated aiming to understand the coordination mechanism at an atomic level. GGA-DFT/PCM calculations have been performed for the different conformations and tautomers arising from the Al(3+) and citric acid (H3L) interaction in aqueous solution. The Gibbs reaction energies were estimated based on the reaction of the trigonal planar Al(OH)3 and H3L to form different Al-citrate complexes. The estimated Gibbs free reaction energies for the [AlL], [AlHL](+), and [Al(OH)L](-) species are in good agreement with the experimental values. In these species, the Al(3+) center is coordinated by two carboxylic and the tertiary hydroxyl groups of the citrate. Conversely to what has been proposed based on the experiments, the present theoretical calculations indicate that the citric acid hydroxyl group remains protonated upon the coordination of Al(3+). In fact, our model turns out to be more consistent with the relative pKa values of citrate protonation groups and with the hydrolysis constant of the H2O bound to Al(3+) leading to better agreement with the available experimental data.
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Affiliation(s)
- Antonio Luiz Oliveira de Noronha
- Grupo de Pesquisa em Química Inorgânica Teórica - GPQIT, Departamento de Química-ICEx-UFMG, 31.270-901 Belo Horizonte, MG, Brazil
| | - Luciana Guimarães
- Grupo de Pesquisa em Química Inorgânica Teórica - GPQIT, Departamento de Química-ICEx-UFMG, 31.270-901 Belo Horizonte, MG, Brazil
| | - Hélio Anderson Duarte
- Grupo de Pesquisa em Química Inorgânica Teórica - GPQIT, Departamento de Química-ICEx-UFMG, 31.270-901 Belo Horizonte, MG, Brazil
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18
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Zhang H, Waychunas GA, Banfield JF. Molecular Dynamics Simulation Study of the Early Stages of Nucleation of Iron Oxyhydroxide Nanoparticles in Aqueous Solutions. J Phys Chem B 2015. [DOI: 10.1021/acs.jpcb.5b03801] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Hengzhong Zhang
- Department
of Earth and Planetary Science, University of California, Berkeley, California 94720, United States
| | - Glenn A. Waychunas
- Earth
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Jillian F. Banfield
- Department
of Earth and Planetary Science, University of California, Berkeley, California 94720, United States
- Earth
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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19
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Afaneh AT, Schreckenbach G, Wang F. Theoretical Study of the Formation of Mercury (Hg2+) Complexes in Solution Using an Explicit Solvation Shell in Implicit Solvent Calculations. J Phys Chem B 2014; 118:11271-83. [DOI: 10.1021/jp5045089] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Akef T. Afaneh
- Department of Chemistry and ‡Centre for Earth Observation Science, Department
of Environment and Geography, University of Manitoba, Winnipeg, MB Canada, R3T 2N2
| | - Georg Schreckenbach
- Department of Chemistry and ‡Centre for Earth Observation Science, Department
of Environment and Geography, University of Manitoba, Winnipeg, MB Canada, R3T 2N2
| | - Feiyue Wang
- Department of Chemistry and ‡Centre for Earth Observation Science, Department
of Environment and Geography, University of Manitoba, Winnipeg, MB Canada, R3T 2N2
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20
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Gupta M, da Silva EF, Svendsen HF. Explicit Solvation Shell Model and Continuum Solvation Models for Solvation Energy and pKa Determination of Amino Acids. J Chem Theory Comput 2013; 9:5021-37. [DOI: 10.1021/ct400459y] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mayuri Gupta
- Department
of Chemical Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
| | - Eirik F. da Silva
- Department
of Process Technology, SINTEF Materials and Chemistry, N-7465 Trondheim, Norway
| | - Hallvard F. Svendsen
- Department
of Chemical Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
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21
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Duarte HA, Vankova N, Ferreira IP, Paniago EB, Heine T. Chemical Speciation of Metal Complexes from Chemical Shift Calculations: The Interaction of 2-Amino- N-hydroxypropanamide with V(V) in Aqueous Solution. J Phys Chem B 2013; 117:11670-80. [DOI: 10.1021/jp403744y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hélio Anderson Duarte
- Grupo de Pesquisa
em Química Inorgânica Teórica−GPQIT, Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31.270-901 Belo
Horizonte, MG, Brazil
| | - Nina Vankova
- School
of Engineering and Science, Jacobs University Bremen, D-28759 Bremen, Germany
| | - Isabella Pires Ferreira
- Grupo de Pesquisa
em Química Inorgânica Teórica−GPQIT, Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31.270-901 Belo
Horizonte, MG, Brazil
| | - Eucler B. Paniago
- Grupo de Pesquisa
em Química Inorgânica Teórica−GPQIT, Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31.270-901 Belo
Horizonte, MG, Brazil
| | - Thomas Heine
- School
of Engineering and Science, Jacobs University Bremen, D-28759 Bremen, Germany
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22
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Jin X, Yang W, Qian Z, Wang Y, Bi S. DFT study on the interaction between monomeric aluminium and chloride ion in aqueous solution. Dalton Trans 2011; 40:5052-8. [PMID: 21451819 DOI: 10.1039/c0dt01822h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Xiaoyan Jin
- School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry of China & Key Laboratory of MOE for Life Science, Nanjing University, Nanjing, 210093, China
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23
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de Lima GF, Duarte HA, Pliego JR. Dynamical Discrete/Continuum Linear Response Shells Theory of Solvation: Convergence Test for NH4+ and OH− Ions in Water Solution Using DFT and DFTB Methods. J Phys Chem B 2010; 114:15941-7. [DOI: 10.1021/jp110202e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Guilherme Ferreira de Lima
- Grupo de Pesquisa em Química Inorgânica Teórica (GPQIT), Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil, and Departamento de Ciências Naturais, Universidade Federal de São João del-Rei, 36301-160, São João del-Rei, MG, Brazil
| | - Hélio Anderson Duarte
- Grupo de Pesquisa em Química Inorgânica Teórica (GPQIT), Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil, and Departamento de Ciências Naturais, Universidade Federal de São João del-Rei, 36301-160, São João del-Rei, MG, Brazil
| | - Josefredo R. Pliego
- Grupo de Pesquisa em Química Inorgânica Teórica (GPQIT), Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901, Belo Horizonte, MG, Brazil, and Departamento de Ciências Naturais, Universidade Federal de São João del-Rei, 36301-160, São João del-Rei, MG, Brazil
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24
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Lu BM, Jin XY, Tang J, Bi SP. DFT studies of Al–O Raman vibrational frequencies for aquated aluminium species. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.07.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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25
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Mandado M, Cordeiro MNDS. On the stability of metal-aminoacid complexes in water based on water-ligand exchange reactions and electronic properties: Detailed study on iron-glycine hexacoordinated complexes. J Comput Chem 2010; 31:2735-45. [DOI: 10.1002/jcc.21567] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Wander MCF, Rustad JR, Casey WH. Influence of Explicit Hydration Waters in Calculating the Hydrolysis Constants for Geochemically Relevant Metals. J Phys Chem A 2010; 114:1917-25. [DOI: 10.1021/jp908938p] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew C. F. Wander
- Department of Geology, University of California at Davis, Davis, California 95656 and Department of Chemistry, University of California at Davis, Davis, California 95656
| | - James R. Rustad
- Department of Geology, University of California at Davis, Davis, California 95656 and Department of Chemistry, University of California at Davis, Davis, California 95656
| | - William H. Casey
- Department of Geology, University of California at Davis, Davis, California 95656 and Department of Chemistry, University of California at Davis, Davis, California 95656
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27
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Cramer CJ, Truhlar DG. Density functional theory for transition metals and transition metal chemistry. Phys Chem Chem Phys 2009; 11:10757-816. [PMID: 19924312 DOI: 10.1039/b907148b] [Citation(s) in RCA: 1063] [Impact Index Per Article: 70.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We introduce density functional theory and review recent progress in its application to transition metal chemistry. Topics covered include local, meta, hybrid, hybrid meta, and range-separated functionals, band theory, software, validation tests, and applications to spin states, magnetic exchange coupling, spectra, structure, reactivity, and catalysis, including molecules, clusters, nanoparticles, surfaces, and solids.
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Affiliation(s)
- Christopher J Cramer
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455-0431, USA.
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28
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Bryantsev VS, Diallo MS, Goddard WA. Computational Study of Copper(II) Complexation and Hydrolysis in Aqueous Solutions Using Mixed Cluster/Continuum Models. J Phys Chem A 2009; 113:9559-67. [DOI: 10.1021/jp904816d] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Vyacheslav S. Bryantsev
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125
| | - Mamadou S. Diallo
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125
| | - William A. Goddard
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125
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29
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Vieira LMM, Almeida MVD, Abreu HAD, Duarte HA, Grazul RM, Fontes APS. Platinum(II) complexes with fluoroquinolones: Synthesis and characterization of unusual metal–piperazine chelates. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.08.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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30
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Moreno C. HA, Cocke DL, Gomes JAG, Morkovsky P, Parga JR, Peterson E, Garcia C. Electrochemical Reactions for Electrocoagulation Using Iron Electrodes. Ind Eng Chem Res 2009. [DOI: 10.1021/ie8013007] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hector A. Moreno C.
- Instituto Tecnologico de la Laguna, Department of Chemical Engineering, ZC 27000, Torreon, Coahuila, Mexico, Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, Texas 77710, Kaspar Electroplating Corporation, Shiner, Texas 77984, and Instituto Tecnológico de Saltillo, Department of Metallurgy and Materials Science, V. Carranza 2400, C.P. 25280, Saltillo, Coahuila, México
| | - David L. Cocke
- Instituto Tecnologico de la Laguna, Department of Chemical Engineering, ZC 27000, Torreon, Coahuila, Mexico, Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, Texas 77710, Kaspar Electroplating Corporation, Shiner, Texas 77984, and Instituto Tecnológico de Saltillo, Department of Metallurgy and Materials Science, V. Carranza 2400, C.P. 25280, Saltillo, Coahuila, México
| | - Jewel A. G. Gomes
- Instituto Tecnologico de la Laguna, Department of Chemical Engineering, ZC 27000, Torreon, Coahuila, Mexico, Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, Texas 77710, Kaspar Electroplating Corporation, Shiner, Texas 77984, and Instituto Tecnológico de Saltillo, Department of Metallurgy and Materials Science, V. Carranza 2400, C.P. 25280, Saltillo, Coahuila, México
| | - Paul Morkovsky
- Instituto Tecnologico de la Laguna, Department of Chemical Engineering, ZC 27000, Torreon, Coahuila, Mexico, Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, Texas 77710, Kaspar Electroplating Corporation, Shiner, Texas 77984, and Instituto Tecnológico de Saltillo, Department of Metallurgy and Materials Science, V. Carranza 2400, C.P. 25280, Saltillo, Coahuila, México
| | - J. R. Parga
- Instituto Tecnologico de la Laguna, Department of Chemical Engineering, ZC 27000, Torreon, Coahuila, Mexico, Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, Texas 77710, Kaspar Electroplating Corporation, Shiner, Texas 77984, and Instituto Tecnológico de Saltillo, Department of Metallurgy and Materials Science, V. Carranza 2400, C.P. 25280, Saltillo, Coahuila, México
| | - Eric Peterson
- Instituto Tecnologico de la Laguna, Department of Chemical Engineering, ZC 27000, Torreon, Coahuila, Mexico, Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, Texas 77710, Kaspar Electroplating Corporation, Shiner, Texas 77984, and Instituto Tecnológico de Saltillo, Department of Metallurgy and Materials Science, V. Carranza 2400, C.P. 25280, Saltillo, Coahuila, México
| | - Cristina Garcia
- Instituto Tecnologico de la Laguna, Department of Chemical Engineering, ZC 27000, Torreon, Coahuila, Mexico, Department of Chemical Engineering, Lamar University, P.O. Box 10053, Beaumont, Texas 77710, Kaspar Electroplating Corporation, Shiner, Texas 77984, and Instituto Tecnológico de Saltillo, Department of Metallurgy and Materials Science, V. Carranza 2400, C.P. 25280, Saltillo, Coahuila, México
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31
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Yang W, Qian Z, Miao Q, Wang Y, Bi S. Density functional theory study of the aluminium(iii) hydrolysis in aqueous solution. Phys Chem Chem Phys 2009; 11:2396-401. [DOI: 10.1039/b819484j] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Gancheff JS, Kremer C, Denis PA, Giorgi C, Bianchi A. Thermodynamic study of proton transfer reactions of Re(V) trans-dioxocomplexes in aqueous solution. Dalton Trans 2009:8257-68. [DOI: 10.1039/b911121b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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33
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Gilson R, Durrant MC. Estimation of the pKa values of water ligands in transition metal complexes using density functional theory with polarized continuum model solvent corrections. Dalton Trans 2009:10223-30. [DOI: 10.1039/b911593e] [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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34
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Ayala R, Martínez JM, Pappalardo RR, Muñoz Páez A, Sánchez Marcos E. General Quantum-Mechanical Study on the Hydrolysis Equilibria for a Tetravalent Aquaion: The Extreme Case of the Po(IV) in Water. J Phys Chem B 2008; 113:487-96. [DOI: 10.1021/jp804957s] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Regla Ayala
- Departamento Química Inorgánica, University of Sevilla, CSIC, ICMSE, Seville 41092, Spain, and Department of Química Física, University of Sevilla, E-41012 Seville, Spain
| | - José M. Martínez
- Departamento Química Inorgánica, University of Sevilla, CSIC, ICMSE, Seville 41092, Spain, and Department of Química Física, University of Sevilla, E-41012 Seville, Spain
| | - Rafael R. Pappalardo
- Departamento Química Inorgánica, University of Sevilla, CSIC, ICMSE, Seville 41092, Spain, and Department of Química Física, University of Sevilla, E-41012 Seville, Spain
| | - Adela Muñoz Páez
- Departamento Química Inorgánica, University of Sevilla, CSIC, ICMSE, Seville 41092, Spain, and Department of Química Física, University of Sevilla, E-41012 Seville, Spain
| | - Enrique Sánchez Marcos
- Departamento Química Inorgánica, University of Sevilla, CSIC, ICMSE, Seville 41092, Spain, and Department of Química Física, University of Sevilla, E-41012 Seville, Spain
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35
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Bryantsev VS, Diallo MS, van Duin ACT, Goddard III WA. Hydration of Copper(II): New Insights from Density Functional Theory and the COSMO Solvation Model. J Phys Chem A 2008; 112:9104-12. [DOI: 10.1021/jp804373p] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vyacheslav S. Bryantsev
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and Department of Civil Engineering, Howard University, Washington, D.C. 20059
| | - Mamadou S. Diallo
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and Department of Civil Engineering, Howard University, Washington, D.C. 20059
| | - Adri C. T. van Duin
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and Department of Civil Engineering, Howard University, Washington, D.C. 20059
| | - William A. Goddard III
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and Department of Civil Engineering, Howard University, Washington, D.C. 20059
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36
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Bryantsev VS, Diallo MS, Goddard III WA. Calculation of Solvation Free Energies of Charged Solutes Using Mixed Cluster/Continuum Models. J Phys Chem B 2008; 112:9709-19. [DOI: 10.1021/jp802665d] [Citation(s) in RCA: 475] [Impact Index Per Article: 29.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Vyacheslav S. Bryantsev
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and Department of Civil Engineering, Howard University, Washington, D.C. 20059
| | - Mamadou S. Diallo
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and Department of Civil Engineering, Howard University, Washington, D.C. 20059
| | - William A. Goddard III
- Materials and Process Simulation Center, Beckman Institute 139-74, California Institute of Technology, Pasadena, California 91125, and Department of Civil Engineering, Howard University, Washington, D.C. 20059
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37
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De Abreu HA, Aparecida Dos S Lago I, Souza GP, Piló-Veloso D, Duarte HA, de C Alcântara AF. Antioxidant activity of (+)-bergenin: a phytoconstituent isolated from the bark of Sacoglottis uchi Huber (Humireaceae). Org Biomol Chem 2008; 6:2713-8. [PMID: 18633529 DOI: 10.1039/b804385j] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
(+)-Bergenin (1) was isolated from Sacoglottis uchi, a species of vegetable found in the Amazon region and popularly used for the treatment of several hepatic problems. The structure of 1 was fully characterized using IR, GC-MS and NMR (1D and 2D) analyses. This phytoconstituent has been used as an oriental folk medicine for the treatment of many diseases and shows antihepatotoxic properties. Tests with beta-carotene, DPPH and a heterogeneous Fenton system were carried out, confirming the antioxidant activity of 1. Theoretical calculations were performed to investigate the formation of the radical derivatives of 1 using *H, *OH, *CH(3), and *CCl(3) as initiator radicals. DFT thermodynamic calculations showed that the methoxyl group (O-6-CH(3)) is the most favorable site for radical attack. Frontier molecular orbital analysis showed that nucleophilic radical attack is favored on the aromatic ring of 1 where the LUMO is localized, with antibonding character with respect to the O-6-CH(3) bond. The possibilities of attack at other sites on 1 were investigated in detail in order to understand the regiospecificity of this reaction.
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Affiliation(s)
- Heitor A De Abreu
- Departamento de Química, ICEx-Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
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38
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Bühl M, Golubnychiy V. On the Intermediacy of Chlorinated Alkylcobalt Complexes in the Reductive Dehalogenation of Chloroalkenes. A First-Principles Molecular Dynamics Study. Organometallics 2007. [DOI: 10.1021/om7007474] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael Bühl
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Volodymyr Golubnychiy
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
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39
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Magistrato A, Robertazzi A, Carloni P. Nitrogen Fixation by a Molybdenum Catalyst Mimicking the Function of the Nitrogenase Enzyme: A Critical Evaluation of DFT and Solvent Effects. J Chem Theory Comput 2007; 3:1708-20. [DOI: 10.1021/ct700094y] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alessandra Magistrato
- CNR-INFM-Democritos Modelling Center for Atomistic Simulations, International School for Advanced Studies (SISSA/ISAS) and Italian Institute of Technology (IIT) via Beirut 2-4, Trieste, Italy
| | - Arturo Robertazzi
- CNR-INFM-Democritos Modelling Center for Atomistic Simulations, International School for Advanced Studies (SISSA/ISAS) and Italian Institute of Technology (IIT) via Beirut 2-4, Trieste, Italy
| | - Paolo Carloni
- CNR-INFM-Democritos Modelling Center for Atomistic Simulations, International School for Advanced Studies (SISSA/ISAS) and Italian Institute of Technology (IIT) via Beirut 2-4, Trieste, Italy
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40
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Shimodaira Y, Miura T, Kudo A, Kobayashi H. DFT Method Estimation of Standard Redox Potential of Metal Ions and Metal Complexes. J Chem Theory Comput 2007; 3:789-95. [DOI: 10.1021/ct700015t] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshiki Shimodaira
- Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan, and Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan
| | - Toshiko Miura
- Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan, and Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan
| | - Akihiko Kudo
- Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan, and Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan
| | - Hisayoshi Kobayashi
- Department of Applied Chemistry, Faculty of Science, Science University of Tokyo, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan, and Department of Chemistry and Materials Technology, Kyoto Institute of Technology, Matsugasaki, Kyoto 606-8585, Japan
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