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Enhanced Catalytic Activity of Aluminum Complexes for the Ring-Opening Polymerization of ε-Caprolactone.
- Source :
-
Inorganic chemistry [Inorg Chem] 2017 Jul 17; Vol. 56 (14), pp. 7998-8006. Date of Electronic Publication: 2017 Jun 27. - Publication Year :
- 2017
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Abstract
- A series of dinuclear aluminum (Al <subscript>2</subscript> Pyr <subscript>2</subscript> ) complexes bridged by two pyrazole ligands were synthesized, and their catalytic activity toward ring-opening polymerization of ε-caprolactone (CL) was investigated. Different types of the Al-N-N-Al-N-N skeletal ring were found among these Al <subscript>2</subscript> Pyr <subscript>2</subscript> complexes. The butterfly form, L <superscript>Thio</superscript> <subscript>2</subscript> Al <subscript>2</subscript> Me <subscript>4</subscript> , exerted the highest catalytic activity for CL polymerization. κ <superscript>2</superscript> -CL coordination with both Al centers within the butterfly form L <superscript>Thio</superscript> <subscript>2</subscript> Al <subscript>2</subscript> Me <subscript>4</subscript> facilitates the initiation process. Generally speaking, the Al <subscript>2</subscript> Pyr <subscript>2</subscript> complexes exhibited substantially higher catalytic activity for CL polymerization than literature examples such as β-diketiminate- or traiaza-bearing aluminum complexes. In fact, the Al <subscript>2</subscript> Pyr <subscript>2</subscript> complexes can even carry out CL polymerization at room temperature.
Details
- Language :
- English
- ISSN :
- 1520-510X
- Volume :
- 56
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- Inorganic chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 28654240
- Full Text :
- https://doi.org/10.1021/acs.inorgchem.7b00763