Polymers of ε-caprolactone using new copper(II) and zinc(II) complexes as initiators: Synthesis, characterization and X-ray crystal structures

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Abstract

Five of six new Zn(II) and Cu(II) complexes were active in the ring-opening polymerization (ROP) of ε-caprolactone (CL) under solvent-free conditions, producing polycaprolactones (PCLs) of high crystallinity with molecular weights between 22,900 and 38,700 g mol-1 and decomposition temperatures above 260 °C. 1H NMR analysis demonstrated that the PCLs obtained were mainly linear, having hydroxymethylene groups at the chain ends. The results obtained indicated a significant improvement in terms of the ratio of monomer:initiator compared to related Cu(II) and Zn(II) complexes. In addition, the structures of the complexes 1 and 4 were determined by single-crystal X-ray diffraction. The synthesis and full characterization of all complexes are described in this paper.

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Posada, A. F., Macías, M. A., Movilla, S., Miscione, G. P., Pérez, L. D., & Hurtado, J. J. (2018). Polymers of ε-caprolactone using new copper(II) and zinc(II) complexes as initiators: Synthesis, characterization and X-ray crystal structures. Polymers, 10(11). https://doi.org/10.3390/polym10111239

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