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

Subhadip Goswami, Debmalya Ray, Ken Ichi Otake, Chung Wei Kung, Sergio J. Garibay, Timur Islamoglu, Ahmet Atilgan, Yuexing Cui, Christopher J. Cramer, Omar K. Farha, Joseph T. Hupp

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Abstract

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.

Original languageEnglish
Pages (from-to)4477-4482
Number of pages6
JournalChemical Science
Volume9
Issue number19
DOIs
Publication statusPublished - Jan 1 2018

ASJC Scopus subject areas

  • Chemistry(all)

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    Goswami, S., Ray, D., Otake, K. I., Kung, C. W., Garibay, S. J., Islamoglu, T., Atilgan, A., Cui, Y., Cramer, C. J., Farha, O. K., & Hupp, J. T. (2018). A porous, electrically conductive hexa-zirconium(iv) metal-organic framework. Chemical Science, 9(19), 4477-4482. https://doi.org/10.1039/c8sc00961a