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Hancock SN, Yuntawattana N, Diep E, Maity A, Tran A, Schiffman JD, Michaudel Q. Ring-opening metathesis polymerization of N-methylpyridinium-fused norbornenes to access antibacterial main-chain cationic polymers. Proc Natl Acad Sci U S A 2023; 120:e2311396120. [PMID: 38079554 PMCID: PMC10742381 DOI: 10.1073/pnas.2311396120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 10/31/2023] [Indexed: 12/18/2023] Open
Abstract
Cationic polymers have been identified as a promising type of antibacterial molecules, whose bioactivity can be tuned through structural modulation. Recent studies suggest that the placement of the cationic groups close to the core of the polymeric architecture rather than on appended side chains might improve both their bioactivity and selectivity for bacterial cells over mammalian cells. However, antibacterial main-chain cationic polymers are typically synthesized via polycondensations, which do not afford precise and uniform molecular design. Therefore, accessing main-chain cationic polymers with high degrees of molecular tunability hinges upon the development of controlled polymerizations tolerating cationic motifs (or cation progenitors) near the propagating species. Herein, we report the synthesis and ring-opening metathesis polymerization (ROMP) of N-methylpyridinium-fused norbornene monomers. The identification of reaction conditions leading to a well-controlled ROMP enabled structural diversification of the main-chain cationic polymers and a study of their bioactivity. This family of polyelectrolytes was found to be active against both Gram-negative (Escherichia coli) and Gram-positive (Methicillin-resistant Staphylococcus aureus) bacteria with minimal inhibitory concentrations as low as 25 µg/mL. Additionally, the molar mass of the polymers was found to impact their hemolytic activity with cationic polymers of smaller degrees of polymerization showing increased selectivity for bacteria over human red blood cells.
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Affiliation(s)
- Sarah N. Hancock
- Department of Chemistry, Texas A&M University, College Station, TX77843
| | | | - Emily Diep
- Department of Chemical Engineering, University of Massachusetts, Amherst, MA01003
| | - Arunava Maity
- Department of Chemistry, Texas A&M University, College Station, TX77843
| | - An Tran
- Department of Chemistry, Texas A&M University, College Station, TX77843
| | - Jessica D. Schiffman
- Department of Chemical Engineering, University of Massachusetts, Amherst, MA01003
| | - Quentin Michaudel
- Department of Chemistry, Texas A&M University, College Station, TX77843
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX77843
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Hancock SN, Yuntawattana N, Valdez SM, Michaudel Q. Expedient Synthesis and Ring-Opening Metathesis Polymerization of Pyridinonorbornenes. Polym Chem 2022; 13:5530-5535. [PMID: 37193226 PMCID: PMC10168028 DOI: 10.1039/d2py00857b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pyridine-containing polymers are promising materials for a variety of applications from the capture of contaminants to the self-assembly of block copolymers. However, the innate Lewis basicity of the pyridine motif often hampers living polymerization catalyzed by transition-metal complexes. Herein, we report the expedient synthesis of pyridinonorbornene monomers via a [4+2] cycloaddition between 2,3-pyridynes and cyclopentadiene. Well-controlled ring-opening metathesis polymerization was enabled by careful structural design of the monomer. Polypyridinonorbornenes exhibited high Tg and Td, a promising feature for high-temperature applications. Investigation of the polymerization kinetics and of the reactivity of the chain ends shed light on the influence of nitrogen coordination on the chain-growth mechanism.
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Affiliation(s)
- Sarah N Hancock
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
| | - Nattawut Yuntawattana
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
- Present Address: Department of Materials Science, Faculty of Science, Kasetsart University, Bangkok, Thailand
| | - Sara M Valdez
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
| | - Quentin Michaudel
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, USA
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Yuntawattana N, Gregory GL, Carrodeguas LP, Williams CK. Switchable Polymerization Catalysis Using a Tin(II) Catalyst and Commercial Monomers to Toughen Poly(l-lactide). ACS Macro Lett 2021; 10:774-779. [PMID: 34306820 PMCID: PMC8296665 DOI: 10.1021/acsmacrolett.1c00216] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 06/02/2021] [Indexed: 12/15/2022]
Abstract
Sustainable plastics sourced without virgin petrochemicals, that are easily recyclable and with potential for degradation at end of life, are urgently needed. Here, copolymersand blends meeting these criteria are efficiently prepared using a single catalyst and existing commercial monomers l-lactide, propylene oxide, and maleic anhydride. The selective, one-reactor polymerization applies an industry-relevant tin(II) catalyst. Tapered, miscible block polyesters are formed with alkene groups which are postfunctionalized to modulate the polymer glass transition temperature. The polymers are blended at desirable low weight fractions (2 wt %) with commercial poly(l-lactide) (PLLA), increasing toughness, and elongation at break without compromising the elastic modulus, tensile strength, or thermal properties. The selective polymerization catalysis, using commercial monomers and catalyst, provides a straightforward means to improve bioplastics performances.
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Affiliation(s)
- Nattawut Yuntawattana
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.
| | - Georgina L. Gregory
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.
| | - Leticia Peña Carrodeguas
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.
| | - Charlotte K. Williams
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.
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Yuntawattana N, Nakornkhet C, Nanok T, Upitak K, Hormnirun P. Dinuclear aluminum complexes bearing methylene-bridged phenoxy-imine ligands and their application in the ring-opening polymerization of rac-lactide. NEW J CHEM 2020. [DOI: 10.1039/d0nj00154f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The first report on the use of dinuclear aluminum complexes supported by methylene-bridged phenoxy-imine ligands for the ring-opening polymerization of rac-lactide.
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Affiliation(s)
- Nattawut Yuntawattana
- Laboratory of Catalysts and Advanced Polymer Materials
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science, Kasetsart University
- Bangkok 10900
- Thailand
| | - Chutikan Nakornkhet
- Laboratory of Catalysts and Advanced Polymer Materials
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science, Kasetsart University
- Bangkok 10900
- Thailand
| | - Tanin Nanok
- Laboratory of Catalysts and Advanced Polymer Materials
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science, Kasetsart University
- Bangkok 10900
- Thailand
| | - Kanokon Upitak
- Laboratory of Catalysts and Advanced Polymer Materials
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science, Kasetsart University
- Bangkok 10900
- Thailand
| | - Pimpa Hormnirun
- Laboratory of Catalysts and Advanced Polymer Materials
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science, Kasetsart University
- Bangkok 10900
- Thailand
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Yuntawattana N, McGuire TM, Durr CB, Buchard A, Williams CK. Indium phosphasalen catalysts showing high isoselectivity and activity in racemic lactide and lactone ring opening polymerizations. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01484b] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Study of a series of phosphasalen indium alkoxide complexes reveals that the substitution pattern at the phosphorus atoms can deliver outstanding isoselectivity with high rates.
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Affiliation(s)
| | | | - Christopher B. Durr
- Chemistry Research Laboratory
- Department of Chemistry
- University of Oxford
- Oxford
- UK
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Affiliation(s)
- Jason Y. C. Lim
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
- Current address: Institute of Materials Research and Engineering 2 Fusionopolis Way Singapore 138634 Singapore
| | - Nattawut Yuntawattana
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
| | - Paul D. Beer
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
| | - Charlotte K. Williams
- Department of ChemistryUniversity of OxfordChemistry Research Laboratory Mansfield Road Oxford OX1 3TA UK
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Lim JYC, Yuntawattana N, Beer PD, Williams CK. Isoselective Lactide Ring Opening Polymerisation using [2]Rotaxane Catalysts. Angew Chem Int Ed Engl 2019; 58:6007-6011. [PMID: 30861303 PMCID: PMC6519244 DOI: 10.1002/anie.201901592] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Indexed: 01/25/2023]
Abstract
Polylactide (PLA) is a fully biodegradable and recyclable plastic, produced from a bio-derived monomer: it is a circular economy plastic. Its properties depend upon its stereochemistry and isotactic PLA shows superior thermal-mechanical performances. Here, a new means to control tacticity by exploiting rotaxane conformational dynamism is described. Dynamic achiral [2]rotaxanes can show high isoselectivity (Pi =0.8, 298 K) without requiring any chiral additives and enchain by a chain end control mechanism. The organocatalytic dynamic stereoselectivity is likely applicable to other small-molecule and polymerization catalyses.
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Affiliation(s)
- Jason Y C Lim
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK.,Current address: Institute of Materials Research and Engineering, 2 Fusionopolis Way, Singapore, 138634, Singapore
| | - Nattawut Yuntawattana
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - Paul D Beer
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - Charlotte K Williams
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
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