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Ternary gradient metal–organic frameworks

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Abstract

Gradient MOFs contain directional gradients of either structure or functionality. We have successfully prepared two ternary gradient MOFs based on bMOF-100 analogues, namely bMOF-100/102/106 and bMOF-110/100/102, via cascade ligand exchange reactions. The cubic unit cell parameter discrepancy within an individual ternary gradient MOF crystal is as large as ∼1 nm, demonstrating the impressive compatibility and flexibility of the component MOF materials. Because of the presence of a continuum of unit cells, the pore diameters within individual crystals also change in a gradient fashion from ∼2.5 nm to ∼3.0 nm for bMOF-100/102/106, and from ∼2.2 nm to ∼2.7 nm for bMOF-110/100/102, indicating significant porosity gradients. Like previously reported binary gradient MOFs, the composition of the ternary gradient MOFs can be easily controlled by adjusting the reaction conditions. Finally, X-ray diffraction and microspectrophotometry were used to analyse fractured gradient MOF crystals by comparing unit cell parameters and absorbance spectra at different locations, thus revealing the profile of heterogeneity (i.e. gradient distribution of properties) and further confirming the formation of ternary gradient MOFs.

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Publication details

The article was received on 30 Jan 2017, accepted on 16 Feb 2017 and first published on 16 Feb 2017


Article type: Paper
DOI: 10.1039/C7FD00045F
Citation: Faraday Discuss., 2017, Advance Article
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    Ternary gradient metal–organic frameworks

    C. Liu and N. L. Rosi, Faraday Discuss., 2017, Advance Article , DOI: 10.1039/C7FD00045F

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