کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1335750 | 1500280 | 2013 | 6 صفحه PDF | دانلود رایگان |
Two novel dichlorozinc complexes, (peeda)ZnCl2 and (pepda)ZnCl2, where peeda is N1,N2-bis{(R)-1-phenylethyl}ethane-1,2-diamine and pepda is N1,N3-bis{(R)-1-phenylethyl}propane-1,3-diamine, were synthesised and characterised by X-ray diffraction. Dialkyl derivatives of these compounds, generated in situ, efficiently initiated the ring-opening polymerisation (ROP) of rac-lactide (rac-LA). The backbone links, composed of diamine units, had a significant influence on the degree of stereoselectivity in the resulting heterotactic polylactide (PLA). Increased flexibility of the diamine backbone resulted in enhanced heterotacticity. (pepda)ZnMe2 produced heterotactic PLA with a Pr of 0.78 at −25 °C.
New dichloro zinc complexes bearing homochiral diamine ligands were prepared and characterized by spectroscopic methods and X-ray diffraction analysis. Dialkyl derivatives of the zinc complexes initiated the ring-opening polymerisation (ROP) of rac-lactide (rac-LA) to give heterotactic-enriched PLA. The backbone links, composed of diamine units, had a significant influence on the degree of stereoselectivity in the resulting heterotactic polylactide.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 59, 1 August 2013, Pages 138–143