Journal
CHEM
Volume 1, Issue 2, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2016.06.013
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Funding
- Center for Excitonics, an Energy Frontier Research Center - Basic Energy Sciences program of the US Department of Energy Office of Science [DE-SC0001088]
- Saudi Aramco
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The deliberate insertion of redox-active naphthalene diimide ligands into the versatile family of metal-organic frameworks known as MOF-74 (CPO-27) gives rise to a mesoporous electrochromic MOF that can be switched from transparent to dark, a desirable feature in electrochromic devices such as smart windows. Specifically, we report two new materials that have the MOF-74 topology and display redox activity stemming from a naphthalene diimide salicylic acid (NDISA) ligand. We show that these materials can be deposited as thin films on fluorine-doped tin oxide glass. The surprisingly different morphologies of MOF films obtained from Mg2+ and Ni2+ ions is likely controlled by the nucleation kinetics of Mg-2(NDISA) and Ni-2(NDISA), respectively. Both materials exhibit well-behaved quasi-reversible redox events associated with the [NDI]/[NDI](center dot-) and [NDI](center dot-)/[NDI](2-) redox couples, which are also responsible for the electrochromic switching.
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