Redox Control of a Ring-Opening Polymerization Catalyst
Journal of the American Chemical Society2011Vol. 133(24), pp. 9278–9281
Citations Over TimeTop 10% of 2011 papers
Erin M. Broderick, Neng Guo, Carola S. Vogel, Cuiling Xu, Jörg Sutter, Jeffrey T. Miller, Karsten Meyer, Parisa Mehrkhodavandi, Paula L. Diaconescu
Abstract
The activity of an yttrium alkoxide complex supported by a ferrocene-based ligand was controlled using redox reagents during the ring-opening polymerization of L-lactide. The oxidized complex was characterized by X-ray crystallography and (1)H NMR, XANES, and Mössbauer spectroscopy. Switching in situ between the oxidized and reduced yttrium complexes resulted in a change in the rate of polymerization of L-lactide. Synthesized polymers were analyzed by gel permeation chromatography. Polymerization of trimethylene carbonate was also performed with the reduced and oxidized forms of an indium alkoxide complex. The indium system showed the opposite behavior to that of yttrium, revealing a metal-based dependency on the rate of polymerization.
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