Alternating Copolymerization of CO2 and Cyclohexene Oxide Catalyzed by Cobalt-Lanthanide Mixed Multinuclear Complexes

Hiroki Asaba; Takanori Iwasaki; Masahiro Hatazawa; Jingyuan Deng; Haruki Nagae; Kazushi Mashima; Kyoko Nozaki

doi:10.1021/acs.inorgchem.0c01156

Alternating Copolymerization of CO₂ and Cyclohexene Oxide Catalyzed by Cobalt-Lanthanide Mixed Multinuclear Complexes

Inorg Chem. 2020 Jun 15;59(12):7928-7933. doi: 10.1021/acs.inorgchem.0c01156. Epub 2020 Jun 3.

Authors

Hiroki Asaba¹, Takanori Iwasaki¹, Masahiro Hatazawa¹, Jingyuan Deng¹, Haruki Nagae², Kazushi Mashima², Kyoko Nozaki¹

Affiliations

¹ Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
² Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.

PMID: 32489100
DOI: 10.1021/acs.inorgchem.0c01156

Abstract

Heteromultimetallic complexes consisting of three Co(II) ions and one lanthanide ion were synthesized and applied to the alternating copolymerization of CO₂ and cyclohexene oxide. Unlike the conventional cobalt(III) salen complexes, the high thermal stability of the present catalyst allowed us to reach a turnover number of 13000, one of the highest values ever reported for multimetallic systems. The chain propagation was first-order to the catalyst, suggesting a cooperative behavior of the metal centers.