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Yousefi S, Bahri-Laleh N, Nekoomanesh M, Emami M, Sadjadi S, Amin Mirmohammadi S, Tomasini M, Bardají E, Poater A. An efficient initiator system containing AlCl3 and supported ionic-liquid for the synthesis of conventional grade polyisobutylene in mild conditions. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Synthesis, Characterization and Catalytic Property Studies for Isoprene Polymerization of Iron Complexes Bearing Unionized Pyridine-Oxime Ligands. Polymers (Basel) 2022; 14:polym14173612. [PMID: 36080685 PMCID: PMC9459928 DOI: 10.3390/polym14173612] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 08/26/2022] [Accepted: 08/27/2022] [Indexed: 11/17/2022] Open
Abstract
Iron complexes of the types [Fe(HL)2Cl2] (Fe1: HL1 = pyridine-2-aldoxime; Fe2: HL2 = 6-methylpyridine-2-aldoxime; Fe3: HL3 = phenyl-2-pyridylketoxime; Fe4: HL4 = picolinaldehyde O-methyl oxime) were prepared and characterized by elemental analysis and IR spectroscopy. The crystal structure of Fe2, determined by single-crystal X-ray diffraction, featured a distorted octahedral coordination of the iron center binding with two ligands of HL2. The X-ray structure and infrared spectral data indicated that pyridine-oxime ligands act as unionized bidentate ligand by coordinating with Npyridine and Noxime. The catalytic performance for isoprene polymerization, catalyzed by these pyridine-oxime-ligated iron complexes, was examined. For a binary catalytic system combined with MAO, complexes Fe1, Fe3 and Fe4 were found to be highly active (up to 6.5 × 106 g/mol·h) in cis-1,4-alt-3,4 enchained polymerization, with average molecular weights in the range of 60–653 kg/mol and narrow PDI values of 1.7–3.5, even with very low amounts of MAO (Al/Fe = 5). Upon activation with [Ph3C][B(C6F5)4]/AlR3 for the ternary catalytic system, theses complexes showed extremely high activities, as well about 98% yield after 2 min, to afford cis-1,4-alt-3,4-polyisoprene with a molecular weight of 140–420 kg/mol.
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Giri C, Sisk SE, Reisman L, Kammakakam I, Bara JE, West KN, Rabideau BD, Rupar PA. Anionic Ring-Opening Polymerizations of N-Sulfonylaziridines in Ionic Liquids. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c01885] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chandan Giri
- Department of Chemistry & Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Sarah E. Sisk
- Department of Chemistry & Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Louis Reisman
- Department of Chemistry & Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Irshad Kammakakam
- Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Jason E. Bara
- Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
| | - Kevin N. West
- Department of Chemical & Biomolecular Engineering, The University of South Alabama, Mobile, Alabama 36688, United States
| | - Brooks D. Rabideau
- Department of Chemical & Biomolecular Engineering, The University of South Alabama, Mobile, Alabama 36688, United States
| | - Paul A. Rupar
- Department of Chemistry & Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336, United States
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