Embedding alkenes within an icosahedral inorganic fullerene {(NH4)42[Mo132O372(L)30(H2O)72]} for trapping volatile organics

Pow, R. W., Xuan, W., Long, D.-L. , Bell, N. L. and Cronin, L. (2020) Embedding alkenes within an icosahedral inorganic fullerene {(NH4)42[Mo132O372(L)30(H2O)72]} for trapping volatile organics. Chemical Science, 11(9), pp. 2388-2393. (doi: 10.1039/C9SC06217C)

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Eight alkene-functionalized molybdenum-based spherical Keplerate-type (inorganic fullerene) structures have been obtained via both direct and multistep synthetic approaches. Driven by the opportunity to design unique host–guest interactions within hydrophobic, π-electron rich confined environments, we have synthesised {(NH4)42[Mo132O372(L)30(H2O)72]}, where L = (1) acrylic acid, (2) crotonic acid, (3) methacrylic acid, (4) tiglic acid, (5) 3-butenoic acid, (6) 4-pentenoic acid, (7) 5-hexenoic acid, and (8) sorbic acid. The compounds, which are obtained in good yield (10–40%), contain 30 carboxylate-coordinated alkene ligands which create a central cavity with hydrophobic character. Extensive Nuclear Magnetic Resonance (NMR) spectroscopy studies contribute significantly to the complete characterisation of the structures obtained, including both 1D and 2D measurements. In addition, single-crystal X-ray crystallography and subsequently-generated electron density maps are employed to highlight the distribution in ligand tail positions. These alkene-containing structures are shown to effectively encapsulate small alkyl thiols (1-propanethiol (A), 2-propanethiol (B), 1-butanethiol (C), 2-butanethiol (D) and 2-methyl-1-propanethiol (E)) as guests within the central cavity in aqueous solution. The hydrophobically driven clustering of up to 6 equivalents of volatile thiol guests within the central cavity of the Keplerate-type structure results in effective thermal protection, preventing evaporation at elevated temperatures (ΔT ≈ 25 K).

Item Type:Articles
Glasgow Author(s) Enlighten ID:Xuan, Mr Weimin and Long, Dr Deliang and Pow, Mr Robert William and Bell, Dr Nicola and Cronin, Professor Lee
Authors: Pow, R. W., Xuan, W., Long, D.-L., Bell, N. L., and Cronin, L.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Chemical Science
Publisher:Royal Society of Chemistry
ISSN (Online):2041-6539
Published Online:23 January 2020
Copyright Holders:Copyright © 2020 The Royal Society of Chemistry
First Published:First published in Chemical Science 11(9): 2388-2393
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
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