Zinc complexes with guanidine-pyridine hybrid ligands - guanidine effect and catalytic activity

J Borner, I D Vieira, Matthew D Jones, A Doring, D Kuckling, U Florke, S Herres-Pawlis

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41 Citations (SciVal)


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.
Original languageEnglish
Pages (from-to)4441-4456
Number of pages16
JournalEuropean Journal of Inorganic Chemistry
Issue number28
Publication statusPublished - Oct 2011


  • zinc
  • sustainable chemistry
  • ring-opening polymerization
  • density functional calculations
  • biodegradable polymers
  • polymerization
  • polymers


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