NMR Spectroscopic Identification of Ni(II) Species Formed upon Activation of (α-diimine)NiBr2 Polymerization Catalysts with MAO and MMAO
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Dalton Transactions
ISSN: 1477-9226
, E-ISSN: 1477-9234
|
| Output data |
Year: 2018,
Volume: 47,
Number: 14,
Pages: 4968-4974
Pages count
: 7
DOI:
10.1039/c8dt00483h
|
| Authors |
Soshnikov Igor E.
1,2
,
Semikolenova Nina V.
1
,
Bryliakov Konstantin P.
1,2
,
Antonov Artem A.
1,2
,
Zakharov Vladimir A.
1,2
,
Talsi Evgenii P.
1,2
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russian Federation
|
| 2 |
Novosibirsk State University, Novosibirsk, Russian Federation
|
|
Funding (2)
|
1
|
Russian Foundation for Basic Research
|
16-03-00236
|
|
2
|
Federal Agency for Scientific Organizations
|
0303-2016-0009
|
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).