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Zhang C, Si WD, Wang Z, Tung CH, Sun D. Chiral Ligand-Concentration Mediating Asymmetric Transformations of Silver Nanoclusters: NIR-II Circularly Polarized Phosphorescence Lighting. Angew Chem Int Ed Engl 2024; 63:e202404545. [PMID: 38664228 DOI: 10.1002/anie.202404545] [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: 03/05/2024] [Indexed: 07/02/2024]
Abstract
Near infrared (NIR) emitter with circularly polarized phosphorescence (CPP), known as NIR CPP, has emerged as a key part in the research of cutting-edge luminescent materials. However, it remains a challenge to obtain nanoclusters with NIR CPP activity. Here, we propose an asymmetric transformation approach to efficiently synthesize two pairs of chiral silver nanoclusters (R/S-Ag29 and R/S-Ag16) using an achiral Ag10 nanocluster as starting material in the presence of different concentration chiral inducer (R/S)-1,1'-binaphthyl-2,2'-diyl hydrogenphosphate (R/S-BNP). R/S-Ag29, formed in the low-concentration R/S-BNP, exhibits a unique kernel-shell structure consisting of a distorted Ag13 icosahedron and an integrated cage-like organometallic shell with a C3 symmetry, and possesses a superatomic 6-electron configuration (1S2|1P4). By contrast, R/S-Ag16, formed in the high-concentration R/S-BNP, features a sandwich-like pentagram with AgI-pure kernel. Profiting from the hierarchically chiral structures and superatomic kernel-dominated phosphorescence, R/S-Ag29 exhibits infrequent CPP activity in the second near-infrared (975 nm) region, being the first instance of NIR-II CPP observed among CPL-active metal nanoclusters. This study presents a new approach to reduce the difficulty of de novo synthesis for chiral silver nanomaterials, and facilitates the design of CPP-active superatomic nanoclusters in NIR region.
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Affiliation(s)
- Chengkai Zhang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, 250100, Ji'nan, People's Republic of China
| | - Wei-Dan Si
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, 250100, Ji'nan, People's Republic of China
| | - Zhi Wang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, 250100, Ji'nan, People's Republic of China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, 250100, Ji'nan, People's Republic of China
| | - Di Sun
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, 250100, Ji'nan, People's Republic of China
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Organocatalytic Enantioselective Michael Reaction of Aminomaleimides with Nitroolefins Catalyzed by Takemoto's Catalyst. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27227787. [PMID: 36431888 PMCID: PMC9696348 DOI: 10.3390/molecules27227787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 11/06/2022] [Accepted: 11/07/2022] [Indexed: 11/16/2022]
Abstract
Known as electrophiles, maleimides are often used as acceptors in Michael additions to produce succinimides. However, reactions with maleimides as nucleophiles for enantioselective functionalization are only rarely performed. In this paper, a series of bifunctional Takemoto's catalysts were used to organocatalyze the enantioselective Michael reaction of aminomaleimides with nitroolefins. The resulting products were obtained in good yields (76-86%) with up to 94% enantiomer excess (ee). The catalyst type and the substrate scope were broadened using this methodology.
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Han B, Khasnavis SR, Nwerem M, Bertagna M, Ball ND, Ogba OM. Calcium Bistriflimide-Mediated Sulfur(VI)-Fluoride Exchange (SuFEx): Mechanistic Insights toward Instigating Catalysis. Inorg Chem 2022; 61:9746-9755. [PMID: 35700314 PMCID: PMC9241145 DOI: 10.1021/acs.inorgchem.2c01230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
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We report a mechanistic
investigation of calcium bistriflimide-mediated
sulfur(VI)–fluoride exchange (SuFEx) between sulfonyl fluorides
and amines. We determine the likely pre-activation resting state—a
calcium bistriflimide complex with ligated amines—thus allowing
for corroborated calculation of the SuFEx activation barrier at ∼21
kcal/mol, compared to 21.5 ± 0.14 kcal/mol derived via kinetics
experiments. Transition state analysis revealed: (1) a two-point calcium-substrate
contact that activates the sulfur(VI) center and stabilizes the leaving
fluoride and (2) a 1,4-diazabicyclo[2.2.2]octane additive that provides
Brønsted-base activation of the nucleophilic amine. Stable Ca–F
complexes upon sulfonamide formation are likely contributors to inhibited
catalytic turnover, and a proof-of-principle redesign provided evidence
that sulfonamide formation is feasible with 10 mol % calcium bistriflimide. We report a computational and experimental
mechanistic study
of sulfur(VI)-fluoride exchange mediated by a calcium salt. Ca2+ activates the substrate via two critical Lewis acid−base
interactions. Stable fluoride-ligated Ca2+ complexes are
formed upon sulfonamide formation, and computations indicate that
heat and/or fluoride scavengers will facilitate regeneration of the
active Ca2+ species. These calculations guided an experimental
redesign, thus demonstrating improved catalytic efficiency using 10
mol % Ca2+.
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Affiliation(s)
- Brian Han
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, California 92866, United States
| | - Samuel R Khasnavis
- Department of Chemistry, Pomona College, 645 North College Avenue, Claremont, California 91711, United States
| | - Matthew Nwerem
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, California 92866, United States
| | - Michael Bertagna
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, California 92866, United States
| | - Nicholas D Ball
- Department of Chemistry, Pomona College, 645 North College Avenue, Claremont, California 91711, United States
| | - O Maduka Ogba
- Chemistry and Biochemistry Program, Schmid College of Science and Technology, Chapman University, One University Drive, Orange, California 92866, United States
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Gutiérrez-Hernández A, Richaud A, Chacón-García L, Cortés-García CJ, Méndez F, Contreras-Celedón CA. Deep Eutectic Solvent Choline Chloride/ p-toluenesulfonic Acid and Water Favor the Enthalpy-Driven Binding of Arylamines to Maleimide in Aza-Michael Addition. J Org Chem 2021; 86:223-234. [PMID: 33232142 DOI: 10.1021/acs.joc.0c02039] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Deep eutectic solvents (DESs) have been considered "the organic reaction medium of the century" because they can be used as solvents and active catalysts in chemical reactions. However, experimental and theoretical studies are still needed to provide information on the structures of DESs, the kinetics and thermodynamics properties, the interactions between the DESs and the substrates, the effect of water on the DES supramolecular network and its physicochemical properties, and so forth. This information is very useful to understand the essence of the processes that take place in the catalysis of chemical reactions and, therefore, to help in the design of a DES for a specific reaction and sample. This article shows a systematic study of the impact of DES choline chloride/p-toluenesulfonic acid and DES choline chloride/p-toluenesulfonic acid-water in the aza-Michael addition of arylamines to maleimide to obtain aminopyrrolidine-2,5-dione derivatives. The derivatives are obtained under very mild reaction conditions with good yield. The global reaction is exothermic, spontaneous, permitted by enthalpy, and prohibited for entropy. The calculated potential energy surface shows a reaction mechanism of six steps controlled by enthalpy (except the last step that is controlled by entropy). The water incorporated in the supramolecular DES complex stabilizes the transition states and favors the enthalpy-driven binding. A set of H/D exchange NMR experiments validates the transition state existing in the fourth stage of the mechanism.
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Affiliation(s)
- Abelardo Gutiérrez-Hernández
- Departamento de Síntesis Orgánica, Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Edif. B-1, Ciudad Universitaria, Francisco J. Mújica, s/n, Morelia 58030, Michoacán, Mexico
| | - Arlette Richaud
- Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Iztapalapa, A.P. 55-534, México D. F. 09340, Mexico.,Loire Valley Institute for Advanced Studies, Orléans & Tours, France CEMHTI, 1 Avenue de la Recherche Scientifique, Orléans 45000, France
| | - Luis Chacón-García
- Departamento de Síntesis Orgánica, Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Edif. B-1, Ciudad Universitaria, Francisco J. Mújica, s/n, Morelia 58030, Michoacán, Mexico
| | - Carlos J Cortés-García
- Departamento de Síntesis Orgánica, Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Edif. B-1, Ciudad Universitaria, Francisco J. Mújica, s/n, Morelia 58030, Michoacán, Mexico
| | - Francisco Méndez
- Departamento de Química, División de Ciencias Básicas e Ingeniería, Universidad Autónoma Metropolitana-Iztapalapa, A.P. 55-534, México D. F. 09340, Mexico.,Loire Valley Institute for Advanced Studies, Orléans & Tours, France CEMHTI, 1 Avenue de la Recherche Scientifique, Orléans 45000, France
| | - Claudia Araceli Contreras-Celedón
- Departamento de Síntesis Orgánica, Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Edif. B-1, Ciudad Universitaria, Francisco J. Mújica, s/n, Morelia 58030, Michoacán, Mexico
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Choubey PK, Tripathi A, Sharma P, Shrivastava SK. Design, synthesis, and multitargeted profiling of N-benzylpyrrolidine derivatives for the treatment of Alzheimer’s disease. Bioorg Med Chem 2020; 28:115721. [DOI: 10.1016/j.bmc.2020.115721] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2020] [Revised: 08/14/2020] [Accepted: 08/17/2020] [Indexed: 01/01/2023]
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Liu R, Krishnamurthy S, Wu Z, Tummalapalli KSS, Antilla JC. Chiral Calcium Phosphate Catalyzed Enantioselective Amination of 3-Aryl-2-benzofuranones. Org Lett 2020; 22:8101-8105. [PMID: 32969228 DOI: 10.1021/acs.orglett.0c03059] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A 4-tert-butyl-phenyl substituted (R)-[H8]-BINOL chiral calcium phosphate catalyzed enantioselective amination of 3-aryl-2-benzofuranones with dibenzyl azodicarboxylate is described. The catalyst loading of the reaction is 1 mol %. This transformation is facile and has a high degree atom economy, which gave products with good yields and high enantioselectivities (79% to 99%). This reaction has excellent ee and a broad substrate scope with mild reaction conditions.
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Affiliation(s)
- Ruihan Liu
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Suvratha Krishnamurthy
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, P. R. China
| | - Zhenwei Wu
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, P. R. China
| | | | - Jon C Antilla
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, P. R. China.,School of Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China
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7
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Richardson MB, Gabriel KN, Garcia JA, Ashby SN, Dyer RP, Kim JK, Lau CJ, Hong J, Le Tourneau RJ, Sen S, Narel DL, Katz BB, Ziller JW, Majumdar S, Collins PG, Weiss GA. Pyrocinchonimides Conjugate to Amine Groups on Proteins via Imide Transfer. Bioconjug Chem 2020; 31:1449-1462. [PMID: 32302483 DOI: 10.1021/acs.bioconjchem.0c00143] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Advances in bioconjugation, the ability to link biomolecules to each other, small molecules, surfaces, and more, can spur the development of advanced materials and therapeutics. We have discovered that pyrocinchonimide, the dimethylated analogue of maleimide, undergoes a surprising transformation with biomolecules. The reaction targets amines and involves an imide transfer, which has not been previously reported for bioconjugation purposes. Despite their similarity to maleimides, pyrocinchonimides do not react with free thiols. Though both lysine residues and the N-termini of proteins can receive the transferred imide, the reaction also exhibits a marked preference for certain amines that cannot solely be ascribed to solvent accessibility. This property is peculiar among amine-targeting reactions and can reduce combinatorial diversity when many available reactive amines are available, such as in the formation of antibody-drug conjugates. Unlike amides, the modification undergoes very slow reversion under high pH conditions. The reaction offers a thermodynamically controlled route to single or multiple modifications of proteins for a wide range of applications.
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Affiliation(s)
- Mark B Richardson
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Kristin N Gabriel
- Department of Molecular Biology & Biochemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Joseph A Garcia
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Shareen N Ashby
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Rebekah P Dyer
- Department of Molecular Biology & Biochemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Joshua K Kim
- Department of Molecular Biology & Biochemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Calvin J Lau
- Department of Physics & Astronomy, University of California, Irvine, Irvine, California 92697, United States
| | - John Hong
- School of Medicine, University of California, Irvine, Irvine, California 92697, United States
| | - Ryan J Le Tourneau
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Sanjana Sen
- Department of Molecular Biology & Biochemistry, University of California, Irvine, Irvine, California 92697, United States
| | - David L Narel
- Department of Molecular Biology & Biochemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Benjamin B Katz
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Joseph W Ziller
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Sudipta Majumdar
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Philip G Collins
- Department of Physics & Astronomy, University of California, Irvine, Irvine, California 92697, United States
| | - Gregory A Weiss
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States.,Department of Molecular Biology & Biochemistry, University of California, Irvine, Irvine, California 92697, United States
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8
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Lin Y, Hirschi WJ, Kunadia A, Paul A, Ghiviriga I, Abboud KA, Karugu RW, Vetticatt MJ, Hirschi JS, Seidel D. A Selenourea-Thiourea Brønsted Acid Catalyst Facilitates Asymmetric Conjugate Additions of Amines to α,β-Unsaturated Esters. J Am Chem Soc 2020; 142:5627-5635. [PMID: 32118419 PMCID: PMC7533150 DOI: 10.1021/jacs.9b12457] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
β-Amino esters are obtained with high levels of enantioselectivity via the conjugate addition of cyclic amines to unactivated α,β-unsaturated esters. A related strategy enables the kinetic resolution of racemic cyclic 2-arylamines, using benzyl acrylate as the resolving agent. Reactions are facilitated by an unprecedented selenourea-thiourea organocatalyst. As elucidated by DFT calculations and 13C kinetic isotope effect studies, the rate-limiting and enantiodetermining step of the reaction is the protonation of a zwitterionic intermediate by the catalyst. This represents a rare case in which a thiourea compound functions as an asymmetric Brønsted acid catalyst.
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Affiliation(s)
- Yingfu Lin
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - William J Hirschi
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Anuj Kunadia
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Ion Ghiviriga
- Center for NMR Spectroscopy, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Khalil A Abboud
- Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Rachael W Karugu
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Mathew J Vetticatt
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Jennifer S Hirschi
- Department of Chemistry, Binghamton University, Binghamton, New York 13902, United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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Vasilenko V, Blasius CK, Wadepohl H, Gade LH. Borohydride intermediates pave the way for magnesium-catalysed enantioselective ketone reduction. Chem Commun (Camb) 2020; 56:1203-1206. [PMID: 31904033 DOI: 10.1039/c9cc09111d] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A magnesium precatalyst for the highly enantioselective hydro-boration of C[double bond, length as m-dash]O bonds is reported. The mechanistic basis of the unprecedented selectivity of this transformation has been investi-gated experimentally by isolation of catalytic intermediates and theoretically by DFT calculations. The facile formation of a magnesium borohydride species is critical in overcoming competing pathways in the selectivity-determining insertion step.
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Affiliation(s)
- Vladislav Vasilenko
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Clemens K Blasius
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Lutz H Gade
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
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Yu L, Qian R, Deng X, Wang F, Xu Q. Calcium-catalyzed reactions of element-H bonds. Sci Bull (Beijing) 2018; 63:1010-1016. [PMID: 36658887 DOI: 10.1016/j.scib.2018.06.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 05/27/2018] [Accepted: 05/28/2018] [Indexed: 01/21/2023]
Abstract
Investigation on organocalcium catalysis is just unfolding during the past decade. Beside conventional Ca salts with strong electron-withdrawing counter anions that may serve as Lewis acid catalysts, many Ca complexes have also been designed recently and found to be good catalysts in activation of element-H (EH) bonds like transition metal catalysts. These findings are interesting and may attract the interest of the chemists. Due to the great abundance, non-toxicity, and biocompatible features of Ca element, Ca-catalyzed reactions can be of great significance from the viewpoint of industry. This short review summarizes the recent advances on Ca-catalyzed reactions of EH bonds. We hope that it may provide a useful guide for interested readers from both the academy and industry.
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Affiliation(s)
- Lei Yu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | | | - Xin Deng
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Fang Wang
- Yangzhou Polytechnology Institute, Yangzhou 225127, China
| | - Qing Xu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
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