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[Bis(guanidine)]zinc Complexes and Their Application in Lactide Polymerisation
Author(s) -
Börner Janna,
HerresPawlis Sonja,
Flörke Ulrich,
Huber Klaus
Publication year - 2007
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200700894
Subject(s) - chemistry , zinc , guanidine , polymerization , lactide , polymer chemistry , trifluoromethanesulfonate , diamine , ring opening polymerization , polymer , copolymer , monomer , medicinal chemistry , organic chemistry , catalysis
The bis(guanidine)‐stabilised zinc complexes [ N 1 , N 2 ‐bis(1,3‐dimethylimidazolidin‐2‐ylidene)ethane‐1,2‐diamine]dichloridozinc(II), [Zn(DMEG 2 e)Cl 2 ] ( C1 ), diacetato[ N 1 , N 2 ‐bis(1,3‐dimethylimidazolidin‐2‐ylidene)ethane‐1,2‐diamine]zinc(II),[Zn(DMEG 2 e)(CH 3 COO) 2 ] ( C2 ), and bis[ N 1 , N 2 ‐bis(1,3‐dimethylimidazolidin‐2‐ylidene)ethane‐1,2‐diamine]zinc(II) bis(trifluoromethanesulfonate), [Zn(DMEG 2 e) 2 ](CF 3 SO 3 ) 2 ( C3 ), have been synthesised and completely characterised by means of X‐ray structure analysis, NMR spectroscopy and mass spectrometry. These [bis(guanidine)]zinc complexes were investigated regarding their activity in the bulk polymerisation of D , L ‐lactide. It could be shown that these compounds are able to act as initiators for lactide polymerisation, and polylactides with molecular weights ( M w ) of around 18000–59000 g/mol could be obtained. Variation of the reaction temperature revealed that the molecular weights decrease with increasing temperature. Additionally, the correlation of the intrinsic viscosity with the molecular weight demonstrates that the obtained polymers are linear and structurally homogeneous.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)