Yttrocene Chloride and Methyl Complexes with Variously\nSubstituted Cyclopentadienyl Ligands: Synthesis,\nCharacterization, and Reactivity toward Ethylene

0464378 - ÚFCH JH 2017 RIV DE eng J - Článek v odborném periodiku
Fridrichová, A. - Varga, Vojtěch - Pinkas, Jiří - Lamač, Martin - Růžička, A. - Horáček, Michal
Yttrocene Chloride and Methyl Complexes with Variously
Substituted Cyclopentadienyl Ligands: Synthesis,
Characterization, and Reactivity toward Ethylene.
European Journal of Inorganic Chemistry. Roč. 2016, č. 23 (2016), s. 3713-3721. ISSN 1434-1948. E-ISSN 1099-0682
Grant CEP: GA ČR(CZ) GAP207/12/2368
Institucionální podpora: RVO:61388955
Klíčová slova: Alkylation * Cyclopentadienyl ligands * Metallocenes
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 2.444, rok: 2016

The reaction of YCl3·3.5THF with 1 equiv. of
Li(C5Me4SiMe3) afforded in high yield the ionic complex
[Li(thf )4]+{[(η5-C5Me4SiMe3)YCl2]4(μ4-Cl)}– (1). The molecule of 1
consists of the tetranuclear anion {[(η5-C5Me4SiMe3)YCl2]4(μ4-
Cl)}– compensated with [Li(thf )4]+ in the solid state. Reactions
of compound 1 with selected lithium and potassium cyclopentadienides
resulted in the formation of yttrocene chloride complexes
[(η5-C5Me4SiMe3)Y(L)(μ-Cl)2M(thf)2] [M = Li, L = η5-C5H5
(2); M = Li, L = η5-C5Me5 (3); M = Li, L = η5-C5Me4SiMe2H (4);
M = K, L = η5-C5Me4CH2Ph (5)]. Yttrocene chloride complexes 2–5 underwent methylation reactions to give yttrocene methyl
complexes [(η5-C5Me4SiMe3)Y(L)(μ-Me)2Li(thf )2] [L = η5-C5H5 (6);
L = η5-C5Me5 (7); L = η5-C5Me4SiMe2H (8); L = η5-C5Me4CH2Ph
(9)]. The products of all these reactions were characterized by
NMR and IR spectroscopy, and 2–5 were further studied by ESI
mass spectrometry. The molecular structures of 1 and 4 were
determined by single-crystal XRD. The methyl-bridged complexes
6–9 were tested as homogeneous catalysts for ethylene
polymerization in the absence of cocatalysts.
Trvalý link: http://hdl.handle.net/11104/0263282