Abstract
A series of aluminum complexes featuring with the ketiminate ligand, OCMeCHCMeNHAr (Ar = 2,6-iPr2C6H3, 1), have been prepared and characterized spectroscopically and structurally. Reactions of 1 with trialkylaluminum in 1:1 or 1:2 molar ratio generate four- and five-coordinated aluminum complexes (OCMeCHCMeNAr)AlR2 (R = Me (2); R = Et (3)) and (OCMeCHCMeNAr)2AlR (R = Me (4); R = Et (5)) in high yields. Similarly, reaction of AlCl3 with 1 or 2 equiv of the lithiated 1 in toluene afforded bis(ketiminate) aluminum chloride complex, (OCMeCHCMeNAr)2AlCl (6) or (OCMeCHCMeNAr)AlCl2 (7). Surprisingly, reacting 6 with 1 equiv of AgBF4 in methylene/acetonitrile mixsolvents generates (OCMeCHCMeNAr)2AlF (8) in moderate yield. The structures of complexes 2-6 and 8 have been determined by X-ray crystallography. Complexes 2 and 3 both exhibit tetrahedron structures with the aluminum atom surrounded by oxygen and nitrogen atoms of chelating ketiminate and two alkyl groups. The mono- and bis-ketiminate aluminum complexes 2 - 5 have shown moderate activity toward the ring-opening polymerization of ε-caprolactone.
| Original language | English |
|---|---|
| Pages (from-to) | 6450-6455 |
| Number of pages | 6 |
| Journal | Inorganic Chemistry |
| Volume | 41 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - 2002 Dec 2 |
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All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Inorganic Chemistry
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Four- and five-coordinate aluminum ketiminate complexes : Synthesis, characterization, and ring-opening polymerization. / Yu, Ru Ching; Hung, Chen Hsiung; Huang, Jui-Hsien; Lee, Horng Yi; Chen, Jwu Ting.
In: Inorganic Chemistry, Vol. 41, No. 24, 02.12.2002, p. 6450-6455.Research output: Contribution to journal › Article
TY - JOUR
T1 - Four- and five-coordinate aluminum ketiminate complexes
T2 - Synthesis, characterization, and ring-opening polymerization
AU - Yu, Ru Ching
AU - Hung, Chen Hsiung
AU - Huang, Jui-Hsien
AU - Lee, Horng Yi
AU - Chen, Jwu Ting
PY - 2002/12/2
Y1 - 2002/12/2
N2 - A series of aluminum complexes featuring with the ketiminate ligand, OCMeCHCMeNHAr (Ar = 2,6-iPr2C6H3, 1), have been prepared and characterized spectroscopically and structurally. Reactions of 1 with trialkylaluminum in 1:1 or 1:2 molar ratio generate four- and five-coordinated aluminum complexes (OCMeCHCMeNAr)AlR2 (R = Me (2); R = Et (3)) and (OCMeCHCMeNAr)2AlR (R = Me (4); R = Et (5)) in high yields. Similarly, reaction of AlCl3 with 1 or 2 equiv of the lithiated 1 in toluene afforded bis(ketiminate) aluminum chloride complex, (OCMeCHCMeNAr)2AlCl (6) or (OCMeCHCMeNAr)AlCl2 (7). Surprisingly, reacting 6 with 1 equiv of AgBF4 in methylene/acetonitrile mixsolvents generates (OCMeCHCMeNAr)2AlF (8) in moderate yield. The structures of complexes 2-6 and 8 have been determined by X-ray crystallography. Complexes 2 and 3 both exhibit tetrahedron structures with the aluminum atom surrounded by oxygen and nitrogen atoms of chelating ketiminate and two alkyl groups. The mono- and bis-ketiminate aluminum complexes 2 - 5 have shown moderate activity toward the ring-opening polymerization of ε-caprolactone.
AB - A series of aluminum complexes featuring with the ketiminate ligand, OCMeCHCMeNHAr (Ar = 2,6-iPr2C6H3, 1), have been prepared and characterized spectroscopically and structurally. Reactions of 1 with trialkylaluminum in 1:1 or 1:2 molar ratio generate four- and five-coordinated aluminum complexes (OCMeCHCMeNAr)AlR2 (R = Me (2); R = Et (3)) and (OCMeCHCMeNAr)2AlR (R = Me (4); R = Et (5)) in high yields. Similarly, reaction of AlCl3 with 1 or 2 equiv of the lithiated 1 in toluene afforded bis(ketiminate) aluminum chloride complex, (OCMeCHCMeNAr)2AlCl (6) or (OCMeCHCMeNAr)AlCl2 (7). Surprisingly, reacting 6 with 1 equiv of AgBF4 in methylene/acetonitrile mixsolvents generates (OCMeCHCMeNAr)2AlF (8) in moderate yield. The structures of complexes 2-6 and 8 have been determined by X-ray crystallography. Complexes 2 and 3 both exhibit tetrahedron structures with the aluminum atom surrounded by oxygen and nitrogen atoms of chelating ketiminate and two alkyl groups. The mono- and bis-ketiminate aluminum complexes 2 - 5 have shown moderate activity toward the ring-opening polymerization of ε-caprolactone.
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U2 - 10.1021/ic025785j
DO - 10.1021/ic025785j
M3 - Article
VL - 41
SP - 6450
EP - 6455
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 24
ER -