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

DOI: 10.1039/c3ce41228h DOI Help

Authors: Juergen Kahr (University of St Andrews) , Russell Morris (University of St Andrews) , Paul Wright (University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Crystengcomm

State: Published (Approved)
Published: October 2013

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.

Diamond Keywords: Gas Separation

Subject Areas: Chemistry, Materials, Engineering

Instruments: I11-High Resolution Powder Diffraction

Added On: 04/10/2013 10:12

Discipline Tags:

Chemistry Materials Science Metal-Organic Frameworks Metallurgy Organometallic Chemistry

Technical Tags:

Diffraction X-ray Powder Diffraction