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Issue 45, 2013

Post-synthetic incorporation of nickel into CPO-27(Mg) to give materials with enhanced permanent porosity

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Abstract

Nickel cations have been introduced into framework sites of the magnesium dioxiterephthalate MOF, CPO-27(Mg), via a procedure involving post-synthetic treatment with an aqueous solution of Ni2+ cations and a weak acid. The final solids have Ni concentrations up to 70 mol% of the total cation content. Selected area EDX analysis, synchrotron X-ray powder diffraction and XPS surface analysis indicate that Ni2+ is distributed throughout the crystals with highest concentration at the external surface. A mechanism involving both crystallisation and predominant isomorphous cation replacement is proposed. The modified solids have much enhanced adsorption capacities following simple thermal evacuation under vacuum than unmodified CPO-27(Mg), particularly for N2 at 77 K, for which uptakes of 17 mmol g−1 are achieved. This is attributed to surface modification that makes the surface more stable to heating under evacuation.

Graphical abstract: Post-synthetic incorporation of nickel into CPO-27(Mg) to give materials with enhanced permanent porosity

Supplementary files

Article information


Submitted
25 Jun 2013
Accepted
26 Sep 2013
First published
26 Sep 2013

CrystEngComm, 2013,15, 9779-9786
Article type
Paper

Post-synthetic incorporation of nickel into CPO-27(Mg) to give materials with enhanced permanent porosity

J. Kahr, R. E. Morris and P. A. Wright, CrystEngComm, 2013, 15, 9779 DOI: 10.1039/C3CE41228H

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