NMR Spectroscopic Identification of Ni(II) Species Formed upon Activation of (α-diimine)NiBr2 Polymerization Catalysts with MAO and MMAO Full article
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Dalton Transactions
ISSN: 1477-9226 , E-ISSN: 1477-9234 |
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| Output data | Year: 2018, Volume: 47, Number: 14, Pages: 4968-4974 Pages count : 7 DOI: 10.1039/c8dt00483h | ||||
| Tags | Catalysts; Chemical activation; Electron spin resonance spectroscopy; Ions; Nuclear magnetic resonance spectroscopy; Polymerization | ||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Russian Foundation for Basic Research | 16-03-00236 |
| 2 | Federal Agency for Scientific Organizations | 0303-2016-0009 |
Abstract:
The nature of Ni(II) species formed upon the activation of the Brookhart's α-diimine polymerization pre-catalyst LNiBr2 with MAO and MMAO (L = 1,4-bis-2,4,6-dimethylphenyl-2,3-dimethyl-1,4-diazabuta-1,3-diene) has been established using 1H and 13C NMR spectroscopy. The heterobinuclear ion pair [LNiII(μ-Me)2AlMe2]+[MeMAO]− is observed at the initial stage of the reaction of LNiBr2 with MAO at −40 °C, whereas the ion pair [LNiII–tBu]+[MeMMAO]− predominates at the initial stage of the reaction of LNiBr2 with MMAO under the same conditions. At higher temperatures, both ion pairs transform into a Ni(I) species displaying an axially anisotropic EPR spectrum (g‖ = 2.21, g⊥ = 2.06, A⊥ = 1.06 mT).
Cite:
Soshnikov I.E.
, Semikolenova N.V.
, Bryliakov K.P.
, Antonov A.A.
, Zakharov V.A.
, Talsi E.P.
NMR Spectroscopic Identification of Ni(II) Species Formed upon Activation of (α-diimine)NiBr2 Polymerization Catalysts with MAO and MMAO
Dalton Transactions. 2018. V.47. N14. P.4968-4974. DOI: 10.1039/c8dt00483h WOS Scopus РИНЦ ANCAN PMID OpenAlex
NMR Spectroscopic Identification of Ni(II) Species Formed upon Activation of (α-diimine)NiBr2 Polymerization Catalysts with MAO and MMAO
Dalton Transactions. 2018. V.47. N14. P.4968-4974. DOI: 10.1039/c8dt00483h WOS Scopus РИНЦ ANCAN PMID OpenAlex
Dates:
| Submitted: | Feb 5, 2018 |
| Accepted: | Mar 6, 2018 |
| Published online: | Mar 7, 2018 |
| Published print: | Apr 14, 2018 |
Identifiers:
| Web of science: | WOS:000429743700025 |
| Scopus: | 2-s2.0-85044922614 |
| Elibrary: | 35531793 |
| Chemical Abstracts: | 2018:398396 |
| Chemical Abstracts (print): | 170:412868 |
| PMID: | 29557471 |
| OpenAlex: | W2792373266 |