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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
Published on: February 7, 2017
Phenoxytriamine complexes of yttrium: synthesis, structure and use in the polymerization of lactide and
Ian Westmoreland1, John Arnold
1Department of Chemistry, University of California, Berkeley and the Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720-1460, USA.
Abstract:
Reaction of the phenoxytriamine proligands 2,4-dimethyl-6-bis(2-(diethylamino)ethyl)aminomethlyphenol (HL1) and 2,4-di-tert-butyl-6-bis(2-(diethylamino)ethyl)aminomethylphenol (HL2) with Y[N(SiMe2H)2]3(THF)2 in pentane gave the momomeric complexes L1Y[N(SiMe2H)2]2 (1) and L2Y[N(SiMe2H)2]2 (2). X-Ray structural analysis of 2 shows a 5-coordinate yttrium center. The complexes 1 and 2 catalyze the ring opening polymerization of d-l-lactide and epsilon-caprolactone leading to narrow product polydispersities under mild conditions.
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