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Issue 19, 2018
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A porous, electrically conductive hexa-zirconium(iv) metal–organic framework

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Engendering electrical conductivity in high-porosity metal–organic frameworks (MOFs) promises to unlock the full potential of MOFs for electrical energy storage, electrocatalysis, or integration of MOFs with conventional electronic materials. Here we report that a porous zirconium-node-containing MOF, NU-901, can be rendered electronically conductive by physically encapsulating C60, an excellent electron acceptor, within a fraction (ca. 60%) of the diamond-shaped cavities of the MOF. The cavities are defined by node-connected tetra-phenyl-carboxylated pyrene linkers, i.e. species that are excellent electron donors. The bulk electrical conductivity of the MOF is shown to increase from immeasurably low to 10−3 S cm−1, following fullerene incorporation. The observed conductivity originates from electron donor–acceptor interactions, i.e. charge-transfer interactions – a conclusion that is supported by density functional theory calculations and by the observation of a charge-transfer-derived band in the electronic absorption spectrum of the hybrid material. Notably, the conductive version of the MOF retains substantial nanoscale porosity and continues to display a sizable internal surface area, suggesting potential future applications that capitalize on the ability of the material to sorb molecular species.

Graphical abstract: A porous, electrically conductive hexa-zirconium(iv) metal–organic framework

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The article was received on 28 Feb 2018, accepted on 11 Apr 2018 and first published on 11 Apr 2018

Article type: Edge Article
DOI: 10.1039/C8SC00961A
Chem. Sci., 2018,9, 4477-4482
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    A porous, electrically conductive hexa-zirconium(IV) metal–organic framework

    S. Goswami, D. Ray, K. Otake, C. Kung, S. J. Garibay, T. Islamoglu, A. Atilgan, Y. Cui, C. J. Cramer, O. K. Farha and J. T. Hupp, Chem. Sci., 2018, 9, 4477
    DOI: 10.1039/C8SC00961A

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