Dual Proton-Electron Conductivity in 2D Azaborine Metal-Organic Frameworks
Alice Y Su1, Julius J Oppenheim1, Mircea Dincă1
1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Abstract:
Dual proton-electron conductors are highly sought after for applications in electronics and energy storage. Whereas two-dimensional metal-organic frameworks (MOFs) (2D MOFs) with high electrical conductivity are now numerous, introducing conduits for ion transport in these is challenging. Herein, we report the synthesis of two new mixed electron-proton conductors, M3TABC2 (M = Cu, Zn; TABC = hexahydroxy-1,5,9-triaza-2,6,10-trihydroxyboracoronene), made from a new conjugated azaborine ligand with mobile protons. Cu3TABC2 and Zn3TABC2 show high electronic conductivities of 6.0 × 10-2 S/cm and 2.2 × 10-4 S/cm, and ionic conductivities of 1.6 ± 0.1 × 10-5 S/cm and 1.9 ± 0.4 × 10-5 S/cm, respectively. Overall, this work demonstrates the incorporation of mobile protons into aromatic ligands as a strategy for enabling mixed conductivity in 2D MOFs.
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