Ultra-Tuning of the Rare-Earth fcu-MOF Aperture Size for Selective Molecular Exclusion of Branched Paraffins

Ayalew Hussen Assen Assen, Youssef Belmabkhout, Karim Adil, Prashant Bhatt, Dongxu Xue, Hao Jiang, Mohamed Eddaoudi

Research output: Contribution to journalArticlepeer-review

144 Scopus citations

Abstract

Using isoreticular chemistry allows the design and construction of a new rare-earth metal (RE) fcu-MOF with a suitable aperture size for practical steric adsorptive separations. The judicious choice of a relatively short organic building block, namely fumarate, to bridge the 12-connected RE hexanuclear clusters has afforded the contraction of the well-defined RE-fcu-MOF triangular window aperture, the sole access to the two interconnected octahedral and tetrahedral cages. The newly constructed RE (Y and Tb) fcu-MOF analogues display unprecedented total exclusion of branched paraffins from normal paraffins. The resultant window aperture size of about 4.7 Å, regarded as a sorbate-size cut-off, enabled a complete sieving of branched paraffins from normal paraffins. The results are supported by collective single gas and mixed gas/vapor adsorption and calorimetric studies.
Original languageEnglish (US)
Pages (from-to)14353-14358
Number of pages6
JournalAngewandte Chemie International Edition
Volume54
Issue number48
DOIs
StatePublished - Oct 2 2015

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