Cation-Dependent Intrinsic Electrical Conductivity in Isostructural Tetrathiafulvalene-Based Microporous Metal-Organic Frameworks

Sarah S. Park, Eric R. Hontz, Lei Sun, Christopher Holman Hendon, Aron Walsh, Troy Van Voorhis, Mircea Dinca

Research output: Contribution to journalArticle

179 Citations (Scopus)
24 Downloads (Pure)

Abstract

The isostructural metal-organic frameworks M2(TTFTB) (M = Mn, Co, Zn, and Cd; H4TTFTB = tetrathiafulvalene-tetrabenzoate) exhibit a striking correlation between their single crystal conductivities and the shortest S…S interaction defined by neighboring TTF cores, which inversely correlates with the ionic radius of the metal ions. The larger cations cause a pinching of the S…S contact, which is responsible for better orbital overlap between pz orbitals on neigh-boring S and C atoms. DFT calculations show that these orbitals are critically involved in the valence band of these materials, such that modulation of the S…S distance has an important effect on band dispersion and, implicitly, on the conductivity. The Cd analog, with the largest cation and shortest S…S contact shows the largest electrical conductivity, σ = 2.86 (±0.53) × 10-4 S/cm, which is also among the highest in microporous MOFs. These results describe the first demonstration of tunable intrinsic electrical conductivity in this class of materials and serve as a blueprint for con-trolling charge transport in MOFs with π-stacked motifs.
Original languageEnglish
Pages (from-to)1774-1777
Number of pages4
JournalJournal of the American Chemical Society
Volume137
Issue number5
Early online date18 Jan 2015
DOIs
Publication statusPublished - 11 Feb 2015

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