Issue 21, 2023

Design and synthesis of covalently tethered “isoG-star” as a recyclable host for selective cesium separation

Abstract

The isoguanosine self-assembled pentamer (isoG-star) exhibits remarkable selectivity for Cs+ binding over competing alkali and alkali earth metal cations, rendering it a promising extractor for radioactive waste 137Cs separation. However, to make isoG-star a practical material for Cs+ isolation, the development of a recyclable isoG-star material is required. In this study, a systematic screening of functional isoG derivatives was performed. By employing well-defined complex formation and post-assembly modification, a covalently tethered isoG5-star was prepared through olefin metathesis, utilizing a designed isoG monomer. The application of this newly developed covalently linked isoG-star enabled selective Cs+ extraction, followed by controlled solvent-induced H-bond dissociation. This resulted in the creation of a recyclable Cs+ extractor, demonstrating excellent cation selectivity and good reusability (over seven cycles) for the first time. Consequently, this new supramolecular macrocycle offers a practical new platform for the treatment of radiocesium (134Cs and 137Cs) in an environmentally friendly and highly effective manner.

Graphical abstract: Design and synthesis of covalently tethered “isoG-star” as a recyclable host for selective cesium separation

Supplementary files

Article information

Article type
Communication
Submitted
06 8 2023
Accepted
02 10 2023
First published
04 10 2023

Green Chem., 2023,25, 8494-8499

Author version available

Design and synthesis of covalently tethered “isoG-star” as a recyclable host for selective cesium separation

M. Liu, Y. He, L. Wojtas and X. Shi, Green Chem., 2023, 25, 8494 DOI: 10.1039/D3GC02932H

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