Electrically conductive metal−organic frameworks have emerged as an attractive class of materials for sensing and energy storage applications with unique electronic properties. However, the field lacks structural diversity often because of the limited choices for metal nodes. In this regard, the incorporation of iron has been desirable due to its rich redox chemistry. Herein, we report an Fe-based 2D electrically conductive MOF with 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP), namely Fe-HHTP, that shows redox features and mesoporosity. Fe-HHTP exhibits an electrical conductivity of 3.55×10<sup>-5</sup> S cm<sup>-1</sup> despite a large interlayer spacing of ~6.5 Å due to N,N-dimethylformamide (DMF) axial coordination at the Fe nodes. Spectroscopic results confirm that Fe-HHTP exhibits a mixed valency of Fe(II)/Fe(III) with Fe(II) being dominant. Fe-HHTP boasts exceptional electrical capacitance and apparent redox features compared to the previously reported analogs using the same ligand. We envision that Fe-HHTP can be an excellent candidate for applications in chemical sensing and energy storage where discrete redox potentials are essential.

Iron-based 2-D conductive metal-organic framework with enhanced pseudocapacitance

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