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Bellan EV, Thevenin L, Gayet F, Fliedel C, Poli R. Catalyzed Chain Transfer in Vinyl Acetate Polymerization Mediated by 9-Oxyphenalenone Cobalt(II) Complexes. ACS Macro Lett 2017; 6:959-962. [PMID: 35650898 DOI: 10.1021/acsmacrolett.7b00551] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The vinyl acetate (VAc) radical polymerization initiated by V-70 at 30 °C in the presence of [CoII(OPN)2] (OPN = deprotonated 9-oxyphenalenone), 1, leads to PVAc of lower molecular weight (MW) than expected for organometallic-mediated radical polymerization (OMRP), whether reversible termination or degenerate transfer conditions are used. This represents the first clear evidence of catalyzed chain transfer (CCT) in VAc polymerization. The bis-pyridine adduct [CoII(OPN)2(py)2], 2, shows a marginally lower polymerization rate and an increased CCT activity relative to 1, whereas the activity decreases with marginal effect on the polymerization rate upon addition of excess py. However, raising the temperature to 80 °C (with AIBN as initiator) led to a low MW polymer even in the presence of a large py excess. The CCT was confirmed by 1H NMR characterization of the chain ends and by a MALDI-TOF MS analysis of the recovered polymer. The collective trends are consistent with greater CCT activity for the 5-coordinate complex [CoII(OPN)2(py)] relative to 1 and 2. The presence of py association/dissociation equilibria relating these three complexes was confirmed by a 1H NMR investigation.
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Affiliation(s)
- Ekaterina V. Bellan
- CNRS,
LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, INPT, UPS, 205 route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
| | - Lucas Thevenin
- CNRS,
LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, INPT, UPS, 205 route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
| | - Florence Gayet
- CNRS,
LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, INPT, UPS, 205 route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
| | - Christophe Fliedel
- CNRS,
LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, INPT, UPS, 205 route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
| | - Rinaldo Poli
- CNRS,
LCC (Laboratoire de Chimie de Coordination), Université de Toulouse, INPT, UPS, 205 route de Narbonne, BP 44099, 31077 Toulouse Cedex 4, France
- Institut Universitaire de France, 1, rue Descartes, 75231 Paris Cedex 05, France
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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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Lake BRM, Shaver MP. Iron(ii) β-ketiminate complexes as mediators of controlled radical polymerisation. Dalton Trans 2016; 45:15840-15849. [DOI: 10.1039/c6dt01208f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A series of novel iron(ii) β-ketiminate complexes have been prepared and screened in styrene and methyl methacrylate CRP.
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