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Issue 20, 2020
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Structure and redox tuning of gas adsorption properties in calixarene-supported Fe(ii)-based porous cages

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Abstract

We describe the synthesis of Fe(II)-based octahedral coordination cages supported by calixarene capping ligands. The most porous of these molecular cages has an argon accessible BET surface area of 898 m2 g−1 (1497 m2 g−1 Langmuir). The modular synthesis of molecular cages allows for straightforward substitution of both the bridging carboxylic acid ligands and the calixarene caps to tune material properties. In this context, the adsorption enthalpies of C2/C3 hydrocarbons ranged from −24 to −46 kJ mol−1 at low coverage, where facile structural modifications substantially influence hydrocarbon uptakes. These materials exhibit remarkable stability toward oxidation or decomposition in the presence of air and moisture, but application of a suitable chemical oxidant generates oxidized cages over a controlled range of redox states. This provides an additional handle for tuning the porosity and stability of the Fe cages.

Graphical abstract: Structure and redox tuning of gas adsorption properties in calixarene-supported Fe(ii)-based porous cages

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Supplementary files

Article information


Submitted
30 Mar 2020
Accepted
04 May 2020
First published
04 May 2020

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2020,11, 5273-5279
Article type
Edge Article

Structure and redox tuning of gas adsorption properties in calixarene-supported Fe(II)-based porous cages

M. M. Deegan, T. S. Ahmed, G. P. A. Yap and E. D. Bloch, Chem. Sci., 2020, 11, 5273
DOI: 10.1039/D0SC01833C

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