Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 54, Issue 27, Pages 7886-7890Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201503095
Keywords
chromium(III); cooperative crystallization; indium; metal-organic polyhedra; proton conductivity
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Funding
- US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division [DE-FG02-13ER46972]
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Metal-organic polyhedra (MOPs) or frameworks (MOFs) based on Cr3+ are notoriously difficult to synthesize, especially as crystals large enough to be suitable for characterization of the structure or properties. It is now shown that the co-existence of In3+ and Cr3+ induces a rapid crystal growth of large single crystals of heterometallic In-Cr-MOPs with the [M8L12] (M=In/Cr, L=dinegative 4,5-imidazole-dicarboxylate) cubane-like structure. With a high concentration of protons from 12 carboxyl groups decorating every edge of the cube and an extensive H-bonded network between cubes and surrounding H2O molecules, the newly synthesized In-Cr-MOPs exhibit an exceptionally high proton conductivity (up to 5.8x10(-2)Scm(-1) at 22.5 degrees C and 98% relative humidity, single crystal).
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