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Hashmi OH, Capet F, Visseaux M, Champouret Y. Homoleptic and Heteroleptic Substituted Amidomethylpyridine Iron Complexes: Synthesis, Structure and Polymerization of rac‐Lactide. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Obaid H. Hashmi
- Universite de Lille Faculte des Sciences et Technologies UMR 8181 Campus Scientifique 59655 Villeneuve d'Ascq FRANCE
| | - Frederic Capet
- Universite de Lille Faculte des Sciences et Technologies UMR 8181 Campus Scientifique 59655 Villeneuve d'Ascq FRANCE
| | - Marc Visseaux
- Universite de Lille Faculte des Sciences et Technologies UMR 8181 Campus Scientifique 59655 Villeneuve d'Ascq FRANCE
| | - Yohan Champouret
- Universite de Lille Faculte des Sciences et Technologies UMR 8181 Campus Scientifique 59655 Villeneuve d'Ascq FRANCE
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Pokhriyal D, Heins SP, Sifri RJ, Gentekos DT, Coleman RE, Wolczanski PT, Cundari TR, Fors BP, Lancaster KM, MacMillan SN. Reversible C-C Bond Formation, Halide Abstraction, and Electromers in Complexes of Iron Containing Redox-Noninnocent Pyridine-imine Ligands. Inorg Chem 2021; 60:18662-18673. [PMID: 34889590 DOI: 10.1021/acs.inorgchem.1c01815] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The exploration of pyridine-imine (PI) iron complexes that exhibit redox noninnocence (RNI) led to several interesting discoveries. The reduction of (PI)FeX2 species afforded disproportionation products such as (dmpPI)2FeX (dmp = 2,6-Me2-C6H3, X = Cl, Br; 8-X) and (dippPI)2FeX (dipp = 2,6-iPr2-C6H3, X = Cl, Br; 9-X), which were independently prepared by reductions of (PI)FeX2 in the presence of PI. The crystal structure of 8-Br possessed an asymmetric unit with two distinct electromers, species with different electronic GSs: a low-spin (S = 1/2) configuration derived from an intermediate-spin S = 1 core antiferromagnetically (AF) coupled to an S = 1/2 PI ligand, and an S = 3/2 center resulting from a high-spin S = 2 core AF-coupled to an S = 1/2 PI ligand. Calculations were used to energetically compare plausible ground states. Polydentate diazepane-PI (DHPI) ligands were applied to the synthesis of monomeric dihalides (DHPI)FeX2 (X = Cl, 1-Cl2; X = Br, 1-Br2); reduction generated the highly distorted bioctahedral dimers (DHPA)2Fe2X2 ((3-X)2) containing a C-C bond formed from imine coupling; the monomers 1-X2 could be regenerated upon Ph3CX oxidation. Dihalides and their reduced counterparts were subjected to various alkyl halides and methyl methacrylate (MMA), generating polymers with little to no molecular weight control, indicative of simple radical-initiated polymerization.
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Affiliation(s)
- Devika Pokhriyal
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
| | - Spencer P Heins
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
| | - Renee J Sifri
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
| | - Dillon T Gentekos
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
| | - Rachael E Coleman
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
| | - Peter T Wolczanski
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
| | - Thomas R Cundari
- Department of Chemistry, CASCaM, University of North Texas, Denton, Texas 76201, United States
| | - Brett P Fors
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
| | - Kyle M Lancaster
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
| | - Samantha N MacMillan
- Department of Chemistry & Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York, 14853, United States
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Panda S, Singha Hazari A, Gogia M, Lahiri GK. Diverse Functionalization of Ruthenium-Chelated 2-Picolylamines: Oxygenation, Dehydrogenation, Cyclization, and N-Dealkylation. Inorg Chem 2020; 59:1355-1363. [DOI: 10.1021/acs.inorgchem.9b03065] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sanjib Panda
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Arijit Singha Hazari
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Manish Gogia
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai 400076, India
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Coward DL, Lake BRM, Poli R, Shaver MP. Radically Initiated Group Transfer Polymerization of Methacrylates by Titanium Amino-Phenolate Complexes. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00182] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Daniel L. Coward
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, Edinburgh EH9 3FJ, U.K
| | - Benjamin R. M. Lake
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, Edinburgh EH9 3FJ, U.K
| | - Rinaldo Poli
- CNRS, LCC (Laboratoire de Chimie de Coordination) and Université de Toulouse, UPS, INPT, 205 route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
| | - Michael P. Shaver
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, Edinburgh EH9 3FJ, U.K
- School of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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Fazekas E, Nichol GS, Garden JA, Shaver MP. Iron III Half Salen Catalysts for Atom Transfer Radical and Ring-Opening Polymerizations. ACS OMEGA 2018; 3:16945-16953. [PMID: 31458318 PMCID: PMC6643736 DOI: 10.1021/acsomega.8b02432] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 11/22/2018] [Indexed: 06/10/2023]
Abstract
A series of monometallic pentacoordinate FeIII chloride complexes have been prepared and characterized by high-resolution mass spectrometry and elemental analysis. X-ray diffraction analysis showed that the bis-chelated FeIII complexes bear distorted trigonal bipyramidal geometries. The air- and moisture-stable FeIII complexes were screened as mediators in the reverse atom transfer radical polymerization (ATRP) of styrene and methyl methacrylate. Moderate to excellent control was achieved with dispersities as low as 1.1 for both poly(methyl methacrylate) and polystyrene. Kinetic studies showed living characteristics, and end group analysis revealed the presence of olefin-terminated polymer chains, suggesting catalytic chain transfer as a competing polymerization mechanism. Although the catalysts are not the fastest Fe ATRP mediators, they are robust and flexible. Using propylene oxide as an initiator, the complexes were active catalysts for the ring-opening polymerization of rac-lactide with moderate control. While the addition of propylene oxide has been reported as an efficient method of converting a metal-halide bond to a metal-alkoxide bond in situ, we show herein that this initiation mechanism can limit polymerization reproducibility and introduce an induction period.
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Synthesis and molecular structures of metal complexes (M = Al, Mn, Fe or Co) supported by sterically encumbered salicylaldiminate ligands. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.03.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Coward DL, Lake BRM, Shaver MP. Understanding Organometallic-Mediated Radical Polymerization with an Iron(II) Amine–Bis(phenolate). Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00473] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Daniel L. Coward
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Benjamin R. M. Lake
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, U.K
| | - Michael P. Shaver
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, U.K
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Jiang W, Wang X, Chen J, Liu Y, Han H, Ding Y, Li Q, Tang J. Deuterohemin-Peptide Enzyme Mimic-Embedded Metal-Organic Frameworks through Biomimetic Mineralization with Efficient ATRP Catalytic Activity. ACS APPLIED MATERIALS & INTERFACES 2017; 9:26948-26957. [PMID: 28724289 DOI: 10.1021/acsami.7b09218] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
An enzyme mimic harboring iron porphyrin (DhHP-6) embedded in zeolite imidazolate framework-8 (ZIF-8) was constructed through a biomimetic mineralization approach to obtain composite DhHP-6@ZIF-8. The composite was then used as a catalyst in the atom transfer radical polymerization (ATRP) of poly(ethylene glycol) methyl ether methacrylate (PEGMA500) in which poly(PEGMA500) could be synthesized with monomer conversion of 76.1% and Mn of 45 900 g/mol, stronger than that obtained when using free DhHP-6 as a catalyst. More importantly, it could efficiently overcome the drawbacks of free DhHP-6 and achieve the easy separation of DhHP-6 from the catalytic system and the elimination of iron residues in the synthesized polymer. In addition, it exhibited an enhanced recyclability with monomer conversion of 75.7% after five cycles and favorable stability during the ATRP reaction with <3.0% of DhHP-6 release within 100 h. Thus, the enzyme mimic-ZIF-8 composite developed through biomimetic mineralization can be potentially used as an effective catalyst for preparing well-defined polymers with biomedical applications.
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Affiliation(s)
- Wei Jiang
- Department of Polymer Science, College of Chemistry and ‡Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University , Changchun 130012, China
| | - Xinghuo Wang
- Department of Polymer Science, College of Chemistry and ‡Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University , Changchun 130012, China
| | - Jiawen Chen
- Department of Polymer Science, College of Chemistry and ‡Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University , Changchun 130012, China
| | - Ying Liu
- Department of Polymer Science, College of Chemistry and ‡Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University , Changchun 130012, China
| | - Haobo Han
- Department of Polymer Science, College of Chemistry and ‡Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University , Changchun 130012, China
| | - Yi Ding
- Department of Polymer Science, College of Chemistry and ‡Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University , Changchun 130012, China
| | - Quanshun Li
- Department of Polymer Science, College of Chemistry and ‡Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University , Changchun 130012, China
| | - Jun Tang
- Department of Polymer Science, College of Chemistry and ‡Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University , Changchun 130012, China
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Zerk TJ, Bernhardt PV. Organo-Copper(II) Complexes as Products of Radical Atom Transfer. Inorg Chem 2017; 56:5784-5792. [DOI: 10.1021/acs.inorgchem.7b00402] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Timothy J. Zerk
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
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Zhu K, Dunne J, Shaver MP, Thomas SP. Iron-Catalyzed Heck-Type Alkenylation of Functionalized Alkyl Bromides. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03287] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kailong Zhu
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Joanne Dunne
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Michael P. Shaver
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Stephen P. Thomas
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
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