Abstract
Zinc complexes supported by NN-bidentate AABn ligand (AA Bn-H = (E)-N-[2-(benzyliminomethyl)phenyl]-2,6-diisopropylaniline) are synthesized and fully characterized. The reaction of diethyl zinc (ZnEt 2) with AABn-H (1.1 mol equiv) yields three-coordinated mono-adduct zinc complex [(AABn)ZnEt] (1). However, treatment of AABn-H with ZnEt2 in the same stoichiometric proportion in the presence of 4-dimethylaminopyridine (DMAP, one equiv) affords [(AA Bn)Zn(DMAP)Et] (2) as the tetra-coordinated monomeric zinc complex. Bis-adduct complex [(AABn)2Zn] (3) results from treatment of ZnEt2 with AABn-H (two equiv) in refluxing toluene in high yield. Complexes 1 and 3 are efficient catalysts for the ring-opening polymerization (ROP) of ε-caprolactone (ε-CL) in the presence of alcohol. The "controlled" character of Zn complex 1 also enabled preparation of the PEG-b-PCL copolymer.
Original language | English |
---|---|
Pages (from-to) | 1456-1460 |
Number of pages | 5 |
Journal | Inorganic Chemistry Communication |
Volume | 14 |
Issue number | 9 |
DOIs | |
Publication status | Published - 2011 Sept |
Externally published | Yes |
Keywords
- ε-caprolactone
- Anilido-aldimine
- Catalyst
- NN-bidentate
- Ring-opening polymerization
- Zinc complex
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry