Mono- and bis-amidinate 2,6-xylylimido vanadium chlorides: Synthesis, structure, and reactivity

TY - JOUR

T1 - Mono- and bis-amidinate 2,6-xylylimido vanadium chlorides

T2 - Synthesis, structure, and reactivity

AU - Aharonovich, Sinai

AU - Botoshansky, Mark

AU - Tumanskii, Boris

AU - Nomura, Kotohiro

AU - Waymouth, Robert M.

AU - Eisen, Moris S.

PY - 2010

Y1 - 2010

N2 - Salt metathesis of (2,6-xylylimido) vanadium trichloride (1) with the unsolvated or the TMEDA lithium p-Et benzamidinate complexes (2 and 3, respectively, in 1:2 V:Li molar ratio) yields bis[N,N'-bis(trimethylsilyl) p-Et benzamidinate](2,6-xylylimido)VCl (4) as dark brown, diamond-shaped crystals. When equimolar amounts of complexes 1 and 2 are reacted, a mixture of the bis (4) and mono (5) imidovanadium amidinates results. A similar mixture is also obtained by a ligand metathesis reaction of the bis amidinate complex 4 and complex 1. When the synthesis of the mono amidinate 5 is attempted with the TMEDA lithium amidinate complexes 3 or the 3-pyridyl derivative (7) (in 1:1 V:Li molar ratio) a redox reaction takes place to produce (κ2- TMEDA)(2,6-xylylimido)VIVCl2 (6) as crystalline, mustard-yellow plates. The activity of complex 4 in ethylene polymerization was negligible with MAO or MAO\(CPh3)+[B(C6F 5)4]- as co-catalysts.

AB - Salt metathesis of (2,6-xylylimido) vanadium trichloride (1) with the unsolvated or the TMEDA lithium p-Et benzamidinate complexes (2 and 3, respectively, in 1:2 V:Li molar ratio) yields bis[N,N'-bis(trimethylsilyl) p-Et benzamidinate](2,6-xylylimido)VCl (4) as dark brown, diamond-shaped crystals. When equimolar amounts of complexes 1 and 2 are reacted, a mixture of the bis (4) and mono (5) imidovanadium amidinates results. A similar mixture is also obtained by a ligand metathesis reaction of the bis amidinate complex 4 and complex 1. When the synthesis of the mono amidinate 5 is attempted with the TMEDA lithium amidinate complexes 3 or the 3-pyridyl derivative (7) (in 1:1 V:Li molar ratio) a redox reaction takes place to produce (κ2- TMEDA)(2,6-xylylimido)VIVCl2 (6) as crystalline, mustard-yellow plates. The activity of complex 4 in ethylene polymerization was negligible with MAO or MAO\(CPh3)+[B(C6F 5)4]- as co-catalysts.

UR - http://www.scopus.com/inward/record.url?scp=77953319092&partnerID=8YFLogxK

U2 - 10.1039/b925974k

DO - 10.1039/b925974k

M3 - 文章

C2 - 20480084

AN - SCOPUS:77953319092

SN - 1477-9226

VL - 39

SP - 5643

EP - 5649

JO - Dalton Transactions

JF - Dalton Transactions

IS - 24

ER -