Journal
CRYSTENGCOMM
Volume 15, Issue 45, Pages 9779-9786Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ce41228h
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Funding
- EPSRC [EP/G062129/1]
- Engineering and Physical Sciences Research Council [EP/G062129/1] Funding Source: researchfish
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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 N-2 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.
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