Brooks, Kyle D

Fritsch, Joe

Green, David B

Rheingold, Arnlold

English

Pepperdine Digital Commons

 Synthesis of dimeric zinc complexes for use as ring opening polymerization catalysts   Kyle Brooks Arnold Rheingold David Green Joseph Fritsch Inorganic Chemistry  In this project, new zinc complexes were synthesized to be used in the polymerization of ε-caprolactone (ε-CL) and L-lactide (LA). The complexes that were prepared contained electron-donating and electron-withdrawing substituents. The complexes were analyzed with 1H NMR and broad peaks were observed which suggested a dynamic equilibrium for the complex. Variable temperature 1H NMR spectra were collected and demonstrated that as the temperature decreased, the resonances became sharp and well resolved indicating decreasing fluxional character of the complexes. Single crystal x-ray crystallography elucidated the dimeric solid-state structures of the complexes through bridging ligands between zinc centers. A preliminary study of the zinc complexes showed that they are active ring-opening polymerization initiators for LA and ε-CL achieving percent conversions of 92% conversion to poly-lactic acid (PLA) and 42% for poly-caprolactone (PCL). The isolated polymers were analyzed with gel permeation chromatography and found to have moderate molecular masses with low poly-dispersity index values.   

Synthesis of dimeric zinc complexes for use as ring opening polymerization catalysts

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Synthesis of dimeric zinc complexes for use as ring opening polymerization catalysts

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