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Collins S, Linnolahti M. Sheet Models for Methylaluminoxane (MAO) Activators? A Theoretical Case Study involving rac-Me 2Si(η 5-C 9H 6) 2Zr (SBIZr) Complexes. Chemphyschem 2024; 25:e202300856. [PMID: 38469662 DOI: 10.1002/cphc.202300856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 03/09/2024] [Accepted: 03/10/2024] [Indexed: 03/13/2024]
Abstract
Activation of SBIZrMe2 or SBIZrMeCl and a sheet model for an active component of hydrolytic MAO, (MeAlO)16(Me3Al)6, (16,6) has been studied by DFT. Contact ion-pair formation occurs through the intermediacy of SBIZrMe(Cl) or SBIZrMe2 reacting with sheet 16,6 to furnish SBIZrMe-μ-X(MeAlO)16(Me3Al)6 (2, X=Me, Cl). Contact ion-pairs 2 would be in equilibrium with heterodinuclear catalyst precursors [SBIZrMe2AlMe2][(MeAlO)16(Me3Al)6X] (3 (X=Me, Cl) through reversible binding of Me3Al at higher Al : Zr ratios. Calculations show that formation of ion-pairs 3 from contact ion-pairs 2 is more favourable for the SBIZr compared with the parent Cp2Zr complexes. TD-DFT calculations were conducted on relevant SBIZr complexes to relate the results to earlier spectroscopic studies of catalyst activation using UV-Vis spectroscopy. Finally, propene insertion into ion-pairs 2, SBIZrMe-μ-MeB(C6F5)3 (6) and [SBIZrMe][B(C6F5)4] (7) was studied at M06-2X/TZVP level of theory. These studies suggest that contact ion-pairs 2 are significantly less reactive towards insertion than 6 or 7, in disagreement with experiment.
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Affiliation(s)
- Scott Collins
- Department of Chemistry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, FI-80100, Joensuu, Finland
| | - Mikko Linnolahti
- Department of Chemistry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, FI-80100, Joensuu, Finland
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2
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Collins S, Linnolahti M. Cages versus Sheets: A Critical Comparison in the Size Range Expected for Methylaluminoxane (MAO). Chemphyschem 2023; 24:e202300342. [PMID: 37314040 DOI: 10.1002/cphc.202300342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/14/2023] [Accepted: 06/14/2023] [Indexed: 06/15/2023]
Abstract
New cage models (MeAlO)n (Me3 Al)m (n=16, m=6 or 7) isomeric with previously reported sheet models for the principle activator found in hydrolytic MAO (h-MAO) are compared at M06-2X and MN15 levels of theory using density functional theory with respect to their thermodynamic stability. Reactivity of the neutrals or corresponding anions with formula [(MeAlO)16 (Me3 Al)6 Me]- towards chlorination, and loss of Me3 Al is explored while reactivity of the neutrals towards formation of contact- and outer-sphere ion pairs from Cp2 ZrMe2 and Cp2 ZrMeCl is examined. The results suggest on balance that a cage model for this activator is less consistent with experiment than an isomeric sheet model, although the latter are more stable based on free energy.
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Affiliation(s)
- Scott Collins
- Department of Chemistry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, 80100, Joensuu, Finland
| | - Mikko Linnolahti
- Department of Chemistry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, 80100, Joensuu, Finland
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3
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Collins S, Linnolahti M. Ionization of Cp 2 ZrMe 2 and Lewis Bases by Methylaluminoxane: Computational Insights. Chemphyschem 2023; 24:e202200759. [PMID: 36321588 DOI: 10.1002/cphc.202200759] [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: 10/12/2022] [Revised: 10/20/2022] [Indexed: 11/06/2022]
Abstract
The interactions of the Lewis bases CO, octamethyltrisiloxane (OMTS) and 2,2'-bipyridine (bipy) with a sheet model for the principal activator (MeAlO)16 (Me3 Al)6 (16,6) in hydrolytic methylaluminoxane (MAO) were investigated by DFT. These studies reveal that OMTS and bipy form adducts with Me3 Al prior to methide abstraction by 16,6 to form the ion-pairs [Me2 Al(κ2 -L)][16,6] (5: L=OMTS, 6: L=bipy, [16,6]- =[(MeAlO)16 (Me3 Al)6 Me]- ) while CO simply binds to a reactive edge site without ionization. The binding and activation of Cp2 ZrMe2 with 16,6 to form both neutral adducts 1 Cp2 ZrMe2 ⋅16,6 and contact ion-pairs 4 and 7, both with formula [Cp2 ZrMe][μ-Me(MeAlO)16 (Me3 Al)6 ], featuring terminal and chelated MAO-anions, respectively was studied by DFT. The displacement of the anion with either excess Cp2 ZrMe2 or Me3 Al was also studied, forming outer-sphere ion-pairs [(Cp2 ZrMe)2 μ-Me][16,6] (2) and [Cp2 Zr(μ-Me)2 AlMe2 ][16,6] (3). The theoretical NMR spectra of these species were compared to experimental spectra of MAO and Cp2 ZrMe2 and found to be in good agreement with the reported data and assignments. These studies confirm that 16,6 is a very suitable model for the activators present in MAO but highlight the difficulty in accurately calculating thermodynamic quantities for molecules in this size regime.
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Affiliation(s)
- Scott Collins
- Department of Chemistry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, F80100, Joensuu, Finland.,Former address: Department of Chemistry, University of Victoria, 3800 Finnerty Rd., Victoria, BC, Canada
| | - Mikko Linnolahti
- Department of Chemistry, University of Eastern Finland, Joensuu Campus, Yliopistokatu 7, F80100, Joensuu, Finland
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4
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Collins S, Linnolahti M. Activation of Substituted Metallocene Catalysts using Methylaluminoxane. ChemCatChem 2022. [DOI: 10.1002/cctc.202101918] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Scott Collins
- University of Victoria Faculty of Science chemistry CANADA
| | - Mikko Linnolahti
- University of Eastern Finland Department of Chermistry Yliopistokatu 7 80100 Joensuu FINLAND
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Tyumkina TV, Islamov DN, Kovyazin PV, Parfenova LV. Chain and cluster models of methylaluminoxane as activators of zirconocene hydride, alkyl and metallacyclopropane intermediates in alkene transformations. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111768] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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6
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Zaccaria F, Budzelaar PHM, Cipullo R, Zuccaccia C, Macchioni A, Busico V, Ehm C. Reactivity Trends of Lewis Acidic Sites in Methylaluminoxane and Some of Its Modifications. Inorg Chem 2020; 59:5751-5759. [PMID: 32271565 PMCID: PMC7997381 DOI: 10.1021/acs.inorgchem.0c00533] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Indexed: 11/28/2022]
Abstract
The established model cluster (AlOMe)16(AlMe3)6 for methylaluminoxane (MAO) cocatalyst has been studied by density functional theory, aiming to rationalize the different behaviors of unmodified MAO and TMA-depleted MAO/BHT (TMA = trimethylaluminum; BHT = 2,6-di-tert-butyl-4-methylphenol), highlighted in previous experimental studies. The tendency of the three model Lewis acidic sites A-C to release neutral Al fragments (i.e., AlMe2R; R = Me or bht) or transient aluminum cations (i.e., [AlMeR]+) has been investigated both in the absence and in the presence of neutral N-donors. Sites C are most likely responsible for the activation capabilities of TMA-rich MAO, but TMA depletion destabilizes them, possibly inducing structural rearrangements. The remaining sites A and B, albeit of lower Lewis acidity, should be still able to release cationic Al fragments when TMA-depleted modified MAOs are treated with N-donors (e.g. [AlMe(bht)]+ from MAO/BHT). These findings provide tentative interpretations for earlier observations of donor-dependent ionization tendencies of MAO and MAO/BHT and how TMA depleted MAOs can still be potent activators.
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Affiliation(s)
- Francesco Zaccaria
- Dipartimento
di Scienze Chimiche, Università di
Napoli Federico II, Via Cintia, 80126 Napoli, Italy
- Dipartimento
di Chimica, Biologia e Biotecnologie and CIRCC, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Peter H. M. Budzelaar
- Dipartimento
di Scienze Chimiche, Università di
Napoli Federico II, Via Cintia, 80126 Napoli, Italy
| | - Roberta Cipullo
- Dipartimento
di Scienze Chimiche, Università di
Napoli Federico II, Via Cintia, 80126 Napoli, Italy
| | - Cristiano Zuccaccia
- Dipartimento
di Chimica, Biologia e Biotecnologie and CIRCC, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Alceo Macchioni
- Dipartimento
di Chimica, Biologia e Biotecnologie and CIRCC, Università di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy
| | - Vincenzo Busico
- Dipartimento
di Scienze Chimiche, Università di
Napoli Federico II, Via Cintia, 80126 Napoli, Italy
| | - Christian Ehm
- Dipartimento
di Scienze Chimiche, Università di
Napoli Federico II, Via Cintia, 80126 Napoli, Italy
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7
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Zaccaria F, Sian L, Zuccaccia C, Macchioni A. Ion pairing in transition metal catalyzed olefin polymerization. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2019.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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8
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Preparation of Aryloxy-aluminoxanes and Their Use as Activators in the Bis(imino)pyridyl Iron-catalyzed Oligomerization of Ethylene. CHINESE JOURNAL OF POLYMER SCIENCE 2018. [DOI: 10.1007/s10118-018-2146-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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9
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Collins S, Linnolahti M, Zamora MG, Zijlstra HS, Rodríguez Hernández MT, Perez-Camacho O. Activation of Cp2ZrX2 (X = Me, Cl) by Methylaluminoxane As Studied by Electrospray Ionization Mass Spectrometry: Relationship to Polymerization Catalysis. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00933] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Scott Collins
- Department
of Chemistry, University of Victoria, 3800 Finnerty Rd. Victoria, BC, Canada
- Centro de Investigacion en Quimica Aplicada, CP 25294 Saltillo, COAH, Mexico
| | - Mikko Linnolahti
- Department
of Chemistry, Joensuu Campus, University of Eastern Finland, P.O. Box 111 FI-80101 Joensuu, Finland
| | | | - Harmen S. Zijlstra
- Department
of Chemistry, University of Victoria, 3800 Finnerty Rd. Victoria, BC, Canada
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10
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Kissin YV. Unusual features of ethylene copolymerization reactions with binary metallocene catalysts. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2016. [DOI: 10.1080/10601325.2017.1250309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Theurkauff G, Bader M, Marquet N, Bondon A, Roisnel T, Guegan JP, Amar A, Boucekkine A, Carpentier JF, Kirillov E. Discrete Ionic Complexes of Highly Isoselective Zirconocenes. Solution Dynamics, Trimethylaluminum Adducts, and Implications in Propylene Polymerization. Organometallics 2016. [DOI: 10.1021/acs.organomet.5b00965] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gabriel Theurkauff
- Institut
des Sciences Chimiques de Rennes, Organometallics: Materials and Catalysis
Laboratories, UMR 6226 CNRS-Université de Rennes 1, F-35042 Rennes Cedex, France
| | - Manuela Bader
- Institut
des Sciences Chimiques de Rennes, Organometallics: Materials and Catalysis
Laboratories, UMR 6226 CNRS-Université de Rennes 1, F-35042 Rennes Cedex, France
| | - Nicolas Marquet
- Institut
des Sciences Chimiques de Rennes, Organometallics: Materials and Catalysis
Laboratories, UMR 6226 CNRS-Université de Rennes 1, F-35042 Rennes Cedex, France
| | - Arnaud Bondon
- Institut
des Sciences Chimiques de Rennes, Ingénierie Chimique et Molécules
pour le Vivant, UMR 6226 CNRS-Université de Rennes 1, PRISM, F-35042 Rennes Cedex, France
| | - Thierry Roisnel
- Institut
des Sciences Chimiques de Rennes, Centre de diffraction X, UMR 6226 CNRS-Université de Rennes 1, F-35042 Rennes
Cedex, France
| | - Jean-Paul Guegan
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS-Ecole Nationale Supérieure de Chimie de Rennes, F-35708 Rennes
Cedex, France
| | - Anissa Amar
- Institut
des Sciences Chimiques de Rennes, Chimie Théorique Inorganique, UMR 6226 CNRS-Université de Rennes 1, F-35042 Rennes
Cedex, France
| | - Abdou Boucekkine
- Institut
des Sciences Chimiques de Rennes, Chimie Théorique Inorganique, UMR 6226 CNRS-Université de Rennes 1, F-35042 Rennes
Cedex, France
| | - Jean-François Carpentier
- Institut
des Sciences Chimiques de Rennes, Organometallics: Materials and Catalysis
Laboratories, UMR 6226 CNRS-Université de Rennes 1, F-35042 Rennes Cedex, France
| | - Evgueni Kirillov
- Institut
des Sciences Chimiques de Rennes, Organometallics: Materials and Catalysis
Laboratories, UMR 6226 CNRS-Université de Rennes 1, F-35042 Rennes Cedex, France
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12
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Trefz TK, Henderson MA, Linnolahti M, Collins S, McIndoe JS. Mass spectrometric characterization of methylaluminoxane-activated metallocene complexes. Chemistry 2014; 21:2980-91. [PMID: 25556910 DOI: 10.1002/chem.201405319] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Indexed: 11/11/2022]
Abstract
Electrospray-ionization mass spectrometric studies of poly(methylaluminoxane) (MAO) in the presence of [Cp2 ZrMe2 ], [Cp2 ZrMe(Cl)], and [Cp2 ZrCl2 ] in fluorobenzene (PhF) solution are reported. The results demonstrate that alkylation and ionization are separate events that occur at competitive rates in a polar solvent. Furthermore, there are significant differences in ion-pair speciation that result from the use of metallocene dichloride complexes in comparison to alkylated precursors at otherwise identical Al/Zr ratios. Finally, the counter anions that form are dependent on the choice of precursor and Al/Zr ratio; halogenated aluminoxane anions [(MeAlO)x (Me3 Al)y-z (Me2 AlCl)z Me](-) (z=1, 2, 3…︁) are observed using metal chloride complexes and under some conditions may predominate over their non-halogenated precursors [(MeAlO)x (Me3 Al)y Me](-) . Specifically, this halogenation process appears selective for the anions that form in comparison to the neutral components of MAO. Only at very high Al/Zr ratios is the same "native" anion distribution observed when using [Cp2 ZrCl2 ] when compared with [Cp2 ZrMe2 ]. Together, the results suggest that the need for a large excess of MAO when using metallocene dichloride complexes is a reflection of competitive alkylation vs. ionization, the persistence of unreactive, homodinuclear ion pairs in the case of [Cp2 ZrCl2 ], as well as a change in ion pairing resulting from modification of the anions formed at lower Al/Zr ratios. Models for neutral precursors and anions are examined computationally.
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Affiliation(s)
- Tyler K Trefz
- Department of Chemistry, University of Victoria, P.O. Box 3065 Victoria, BC V8W3V6 (Canada)
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13
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Zijlstra HS, Harder S. Methylalumoxane – History, Production, Properties, and Applications. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402978] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Harmen S. Zijlstra
- Stratingh Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands
- Dutch Polymer Institute (DPI), P. O. Box 902, 5600 AX Eindhoven, Netherlands
| | - Sjoerd Harder
- Dutch Polymer Institute (DPI), P. O. Box 902, 5600 AX Eindhoven, Netherlands
- Inorganic and Organometallic Chemistry, University of Erlangen‐Nürnberg, Egerlandstr. 1, 91058 Erlangen, Germany, http://www.harder‐research.com
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Ghiotto F, Pateraki C, Tanskanen J, Severn JR, Luehmann N, Kusmin A, Stellbrink J, Linnolahti M, Bochmann M. Probing the Structure of Methylalumoxane (MAO) by a Combined Chemical, Spectroscopic, Neutron Scattering, and Computational Approach. Organometallics 2013. [DOI: 10.1021/om4002878] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fabio Ghiotto
- Wolfson Materials and Catalysis
Centre, School of Chemistry, University of East Anglia, Norwich,
United Kingdom
| | - Chrysoula Pateraki
- Wolfson Materials and Catalysis
Centre, School of Chemistry, University of East Anglia, Norwich,
United Kingdom
| | - Jukka Tanskanen
- Department of Chemistry, University of Eastern Finland, Joensuu Campus, FI-80101 Joensuu, Finland
| | - John R. Severn
- UHMwPE Chemistry & Catalysis, DSM, NL-6160MD Geleen, The Netherlands
| | - Nicole Luehmann
- Jülich Centre for Neutron Science and Institute for Complex
Systems, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - André Kusmin
- Jülich Centre for Neutron Science and Institute for Complex
Systems, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Jörg Stellbrink
- Jülich Centre for Neutron Science and Institute for Complex
Systems, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Mikko Linnolahti
- Department of Chemistry, University of Eastern Finland, Joensuu Campus, FI-80101 Joensuu, Finland
| | - Manfred Bochmann
- Wolfson Materials and Catalysis
Centre, School of Chemistry, University of East Anglia, Norwich,
United Kingdom
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Ghiotto F, Pateraki C, Severn JR, Friederichs N, Bochmann M. Rapid evaluation of catalysts and MAO activators by kinetics: what controls polymer molecular weight and activity in metallocene/MAO catalysts? Dalton Trans 2013; 42:9040-8. [PMID: 23462813 DOI: 10.1039/c3dt00107e] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of methylaluminoxane (MAO) catalyst activators of different concentrations and preparative histories on the performance of 1-hexene polymerisations was investigated by kinetic methods, using rac-Me2Si(2-Me-Benz[e]Ind)2ZrCl2 as the standard catalyst precursor. Fast sampling and analysis allow the time dependence of monomer conversion and the growth of the number-average polymer molecular weight to be determined at a sufficiently short timescale to make this a feasible method for routine catalyst evaluation. Differences in productivity, polymer molecular weight and active species count are shown to be primarily a linear function of the trimethylaluminium concentration. The results in toluene and heptane as solvents are compared; the data show that the inferior performance in heptane is due to a substantially lower active species concentration.
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Affiliation(s)
- Fabio Ghiotto
- Wolfson Materials and Catalysis Centre, School of Chemistry, University of East Anglia, Norwich, UK
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Rocchigiani L, Busico V, Pastore A, Macchioni A. Probing the interactions between all components of the catalytic pool for homogeneous olefin polymerisation by diffusion NMR spectroscopy. Dalton Trans 2013; 42:9104-11. [DOI: 10.1039/c3dt00041a] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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17
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Alkylation and activation of metallocene polymerization catalysts by reactions with trimethylaluminum: A computational study. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2012.06.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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18
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Bochmann M. The Chemistry of Catalyst Activation: The Case of Group 4 Polymerization Catalysts. Organometallics 2010. [DOI: 10.1021/om1004447] [Citation(s) in RCA: 296] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Manfred Bochmann
- Wolfson Materials and Catalysis Centre, School of Chemistry, University of East Anglia, Norwich NR4 7TJ, U.K
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Charles R, González-Hernández R, Morales E, Revilla J, Elizalde LE, Cadenas G, Pérez-Camacho O, Collins S. Novel supported catalysts for ethylene polymerization based on aluminohydride-zirconocene complexes. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2009.03.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Linnolahti M, Severn J, Pakkanen T. Formation of Nanotubular Methylaluminoxanes and the Nature of the Active Species in Single‐Site α‐Olefin Polymerization Catalysis. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200802558] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mikko Linnolahti
- Department of Chemistry, University of Joensuu, P.O. Box 111, 80101 Joensuu (Finland), Fax: (+358) 13‐251‐3390
| | - John R. Severn
- Borealis Polymers Oy, P.O. Box 330, 06101 Porvoo (Finland)
| | - Tapani A. Pakkanen
- Department of Chemistry, University of Joensuu, P.O. Box 111, 80101 Joensuu (Finland), Fax: (+358) 13‐251‐3390
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21
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Linnolahti M, Severn J, Pakkanen T. Formation of Nanotubular Methylaluminoxanes and the Nature of the Active Species in Single‐Site α‐Olefin Polymerization Catalysis. Angew Chem Int Ed Engl 2008; 47:9279-83. [DOI: 10.1002/anie.200802558] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Mikko Linnolahti
- Department of Chemistry, University of Joensuu, P.O. Box 111, 80101 Joensuu (Finland), Fax: (+358) 13‐251‐3390
| | - John R. Severn
- Borealis Polymers Oy, P.O. Box 330, 06101 Porvoo (Finland)
| | - Tapani A. Pakkanen
- Department of Chemistry, University of Joensuu, P.O. Box 111, 80101 Joensuu (Finland), Fax: (+358) 13‐251‐3390
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Babushkin DE, Panchenko VN, Timofeeva MN, Zakharov VA, Brintzinger HH. Novel Zirconocene Hydride Complexes in Homogeneous and in SiO2
-Supported Olefin-Polymerization Catalysts Modified with Diisobutylaluminum Hydride or Triisobutylaluminum. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200800084] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Schilling M, Görl C, Alt HG. μ-Gels as support materials for dinuclear olefin polymerization catalysts. J Appl Polym Sci 2008. [DOI: 10.1002/app.28373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kravtsov EA, Bryliakov KP, Semikolenova NV, Zakharov VA, Talsi EP. Activation of Bis(phenoxyimino)zirconium Polymerization Catalysts with Methylaluminoxane and AlMe3/[CPh3]+[B(C6F5)4]-. Organometallics 2007. [DOI: 10.1021/om7004113] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Evgenii A. Kravtsov
- Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, and Natural Sciences Department, Novosibirsk State University, 630090 Novosibirsk, Russian Federation
| | - Konstantin P. Bryliakov
- Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, and Natural Sciences Department, Novosibirsk State University, 630090 Novosibirsk, Russian Federation
| | - Nina V. Semikolenova
- Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, and Natural Sciences Department, Novosibirsk State University, 630090 Novosibirsk, Russian Federation
| | - Vladimir A. Zakharov
- Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, and Natural Sciences Department, Novosibirsk State University, 630090 Novosibirsk, Russian Federation
| | - Evgenii P. Talsi
- Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, and Natural Sciences Department, Novosibirsk State University, 630090 Novosibirsk, Russian Federation
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Lyakin OY, Bryliakov KP, Semikolenova NV, Lebedev AY, Voskoboynikov AZ, Zakharov VA, Talsi EP. 1H and 13C NMR Studies of Cationic Intermediates Formed upon Activation of “Oscillating” Catalyst (2-PhInd)2ZrCl2 with MAO, MMAO, and AlMe3/[CPh3]+[B(C6F5)4]-. Organometallics 2007. [DOI: 10.1021/om0610694] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Oleg Y. Lyakin
- G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russian Federation, and Moscow State University, Lomonosovsky Prospect 1, 113000, Moscow, Russian Federation
| | - Konstantin P. Bryliakov
- G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russian Federation, and Moscow State University, Lomonosovsky Prospect 1, 113000, Moscow, Russian Federation
| | - Nina V. Semikolenova
- G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russian Federation, and Moscow State University, Lomonosovsky Prospect 1, 113000, Moscow, Russian Federation
| | - Artem Y. Lebedev
- G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russian Federation, and Moscow State University, Lomonosovsky Prospect 1, 113000, Moscow, Russian Federation
| | - Alexander Z. Voskoboynikov
- G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russian Federation, and Moscow State University, Lomonosovsky Prospect 1, 113000, Moscow, Russian Federation
| | - Vladimir A. Zakharov
- G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russian Federation, and Moscow State University, Lomonosovsky Prospect 1, 113000, Moscow, Russian Federation
| | - Evgenii P. Talsi
- G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russian Federation, and Moscow State University, Lomonosovsky Prospect 1, 113000, Moscow, Russian Federation
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