EPR Spectroscopic Study of Ni(I) Species in the Catalyst System for Ethylene Polymerization Based on α-diimine Ni(II) Complex Activated by MMAO | Sciact - CRIS-system of Boreskov Institute of Catalysis

EPR Spectroscopic Study of Ni(I) Species in the Catalyst System for Ethylene Polymerization Based on α-diimine Ni(II) Complex Activated by MMAO Full article

Journal

Journal of Organometallic Chemistry
ISSN: 0022-328X

Output data

Year: 2019, Volume: 880, Pages: 267-271 Pages count : 5 DOI: 10.1016/j.jorganchem.2018.11.021

Tags

Monovalent nickel; Ethylene polymerization; EPR; Active species; N,N-α-diimine ligand

Authors

Soshnikov Igor E. ^1,2 , Semikolenova Nina V. ¹ , Bryliakov Konstantin P. ^1,2 , Antonov Artem A. ^1,2 , Sun Wen-Hua ^3,4 , Talsi Evgenii P. ^1,2

Affiliations

1	Siberian Branch of the Russian Academy of Sciences, Boreskov Institute of Catalysis, 630090, Novosibirsk, Pr. Lavrentieva, 5, Russian Federation
2	The Ministry of Education and Science of the Russian Federation, Novosibirsk State University 630090, Novosibirsk, Pirogova Street, 2, Russian Federation
3	Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
4	CAS Research/Education Center for Excellence in Molecular Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China

Funding (3)

1	Russian Foundation for Basic Research National Natural Science Foundation of China	18-53-80031 / 51861145303
2	National Natural Science Foundation of China	5171102116
3	Chinese Academy of Sciences

Using EPR spectroscopy, nickel(I) species formed in the catalyst system 1/MMAO for ethylene polymerization has been investigated (1 = LNiBr2, L = 1,4-bis-2,4,6-dimethylphenyl-2,3-dimethyl-1,4-diazabuta-1,3-dien). It has been shown that diamagnetic cationic complex [LNiII-tBu]+[MeMMAO]– (2) persists in system 1/MMAO at low temperatures, but rapidly decays at 25 °C to give new EPR active species 3 (major product) and 4 (minor product). Species 3 is a nickel(I) complex with the proposed structure [LNiI(S)]+[MeMMAO]– (S = solvent), whereas 4 is L(•−)AlMe2 species. Upon the addition of ethylene, complex 3 partially reversibly converts into the adduct [LNiI(C2H4)]+[MeMMAO]– (5). After ethylene consumption, species 3 restores its original concentration.

Soshnikov I.E. , Semikolenova N.V. , Bryliakov K.P. , Antonov A.A. , Sun W-H. , Talsi E.P.
EPR Spectroscopic Study of Ni(I) Species in the Catalyst System for Ethylene Polymerization Based on α-diimine Ni(II) Complex Activated by MMAO
Journal of Organometallic Chemistry. 2019. V.880. P.267-271. DOI: 10.1016/j.jorganchem.2018.11.021 WOS Scopus РИНЦ РИНЦ РИНЦ AN OpenAlex

Submitted:	Sep 28, 2018
Accepted:	Nov 15, 2018
Published online:	Nov 16, 2018
Published print:	Feb 1, 2019

Web of science:	WOS:000455224100033
Scopus:	2-s2.0-85056869050
Elibrary:	38633202 \| 41780668 \| 41610841
Chemical Abstracts:	2018:2296644
OpenAlex:	W2901450093

DB	Citing
Scopus	23
Web of science	23
Elibrary	22
OpenAlex	24