Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 28, Pages 4441-4456Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201100540
Keywords
Sustainable chemistry; Zinc; Polymerization; Polymers; Biodegradable polymers; Ring-opening polymerization; Density functional calculations
Categories
Funding
- Fonds der Chemischen Industrie (FCI)
- Bundesministerium fur Bildung und Forschung (MoSGrid) [01IG09006]
- Stiftung der Deutschen Wirtschaft
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Two new series of guanidine-pyridine ligands have been synthesised by the reaction of various chloroformamidinium chlorides with 8-aminoquinoline or 2-picolylamine. The ligands were treated with either zinc chloride or zinc acetate to prepare the corresponding complexes, which were tested as initiators in the solvent-free ring-opening polymerisation of D, L-lactide. The effect of the guanidine ligand on the catalytic activity of the zinc complexes was investigated. A great number of the synthesised complexes showed appreciable polymerisation activity. 13 new zinc guanidine complexes have been structurally characterised, including the first examples of structures comprising a tetraethylguanidine unit. The experimental results were complemented by a density functional study, which has probed the influence of substituents at the guanidine unit. Especially for the tetraethylguanidine systems, insights into the strength of delocalisation within guanidine moieties are provided.
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