1. Tetracosanuclear nickel complexes as effective catalysts for cycloaddition of carbon dioxide with epoxides.
- Author
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Liu, Guan-Lin, Wu, En-Hsu, Hung, Yu-Ching, Chou, Wei-Chi, Hung, Chia-Hsin, Lin, Chu-Chieh, and Ko, Bao-Tsan
- Subjects
CARBON dioxide ,EPOXY compounds ,RING formation (Chemistry) ,NICKEL ,CATALYSTS ,SCHIFF bases - Abstract
A series of well-defined tetracosanuclear nickel complexes 3–7 facilely produced by one-pot synthesis were active catalysts for cycloaddition of CO
2 and cyclohexene oxide (CHO). These nickel complexes were doughnut-like supramolecular coordination complexes involving eight repeating units, and each of them contains one Schiff base ligand and three nickel(II) ions. Notably, the 24-nuclear nickel cluster complex 3 in combination with nucleophilic additives was the most efficient catalyst to mediate CO2 coupling with CHO to generate CO2 -based cis-cyclohexene carbonates. In addition to CO2 /CHO cycloaddition, complex 3 was also found to effectively couple CO2 with other alicyclic epoxides, generating the corresponding cyclic carbonates. Additionally, kinetic investigations for CO2 cycloaddition of CHO using 3 were reported. [ABSTRACT FROM AUTHOR]- Published
- 2024
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