An EPR Study of the Vanadium Species Formed upon Interaction of Vanadyl N and C-Capped tris(phenolate) Complexes with AlEt3 and AlEt2Cl Научная публикация
| Журнал |
Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169 |
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| Вых. Данные | Год: 2009, Том: 303, Номер: 1-2, Страницы: 23-29 Страниц : 7 DOI: 10.1016/j.molcata.2008.12.013 | ||||||
| Ключевые слова | Copolymer, Cyclic carbonate, Ionic liquid | ||||||
| Авторы |
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| Организации |
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Информация о финансировании (2)
| 1 | Российский фонд фундаментальных исследований | 06-03-32700 |
| 2 | Royal Society | 2006/R4-IJP |
Реферат:
Reactions of vanadyl N and C-capped tris(phenolate) complexes 1 and 2 (Scheme 1) with AlEt3 and AlEt2Cl, in the absence and in the presence of ethyltrichloroacetate (ETA), were monitored by EPR. It was shown, that vanadium(IV) complexes with proposed structures LNVIV(Et)(AlEt3) and LNVIV(Et)(AlEt2Cl) are formed at the initial stage of interaction of 1 with AlEt3 and AlEt2Cl, respectively (LN are unidentified products of interaction of the initial N-capped ligand and Vdouble bond; length as m-dashO moiety with aluminum alkyls). In the absence of re-activator (ETA), LNVIV(Et)(AlEt3) and LNVIV(Et)(AlEt2Cl) rapidly convert at room temperature to V(III) species, which relatively slowly transform to complexes LNVIIEt2 and LNVII(Et)Cl. Concentration of LNVIV(Et)(AlEt2Cl) dramatically increases in the presence of ETA, that correlates with the increase of the polymerization activity of the catalyst system 1/AlEt2Cl. The complex LNVIV(Et)(AlEt2Cl) can be precursor of the active species of polymerization. Similarly, ETA increases concentration of vanadium(IV) complex LCVIV(Et)(AlEt2Cl) in the catalyst system 2/AlEt2Cl (LC are unidentified products of interaction of the initial C-capped ligand and Vdouble bond; length as m-dashO moiety with aluminum alkyls). The complex LCVIV(Et)(AlEt2Cl) can be precursor of the active species of polymerization.
Библиографическая ссылка:
Soshnikov I.E.
, Semikolenova N.V.
, Bryliakov K.P.
, Zakharov V.A.
, Redshaw C.
, Talzi E.P.
An EPR Study of the Vanadium Species Formed upon Interaction of Vanadyl N and C-Capped tris(phenolate) Complexes with AlEt3 and AlEt2Cl
Journal of Molecular Catalysis A: Chemical. 2009. V.303. N1-2. P.23-29. DOI: 10.1016/j.molcata.2008.12.013 WOS Scopus РИНЦ CAPlusCA OpenAlex
An EPR Study of the Vanadium Species Formed upon Interaction of Vanadyl N and C-Capped tris(phenolate) Complexes with AlEt3 and AlEt2Cl
Journal of Molecular Catalysis A: Chemical. 2009. V.303. N1-2. P.23-29. DOI: 10.1016/j.molcata.2008.12.013 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 1 нояб. 2008 г. |
| Принята к публикации: | 18 дек. 2008 г. |
| Опубликована online: | 30 дек. 2008 г. |
| Опубликована в печати: | 15 апр. 2009 г. |
Идентификаторы БД:
| Web of science: | WOS:000265804600004 |
| Scopus: | 2-s2.0-77953308725 |
| РИНЦ: | 20546114 |
| Chemical Abstracts: | 2009:442221 |
| Chemical Abstracts (print): | 151:508895 |
| OpenAlex: | W2039210244 |