title: Cooperative Crystallization of Heterometallic Indium-Chromium Metal-Organic Polyhedra and Their Fast Proton Conductivity.
abstract: Metal-organic polyhedra (MOPs) or frameworks (MOFs) based on Cr(3+) 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 In(3+) and Cr(3+) 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 5.8×10(-2) S cm(-1) at 22.5 °C and 98% relative humidity, single crystal).
authors.affiliation: Department of Chemistry, University of California, Riverside, CA 92521 (USA) http://research.chem.ucr.edu/groups/feng/
authors.forename: Quan-Guo
authors.initials: QG
authors.lastname: Zhai
authors.affiliation: Department of Chemistry, University of California, Riverside, CA 92521 (USA) http://research.chem.ucr.edu/groups/feng/
authors.forename: Chengyu
authors.initials: C
authors.lastname: Mao
authors.affiliation: Department of Chemistry, University of California, Riverside, CA 92521 (USA) http://research.chem.ucr.edu/groups/feng/
authors.forename: Xiang
authors.initials: X
authors.lastname: Zhao
authors.affiliation: Department of Chemistry, University of California, Riverside, CA 92521 (USA) http://research.chem.ucr.edu/groups/feng/
authors.forename: Qipu
authors.initials: Q
authors.lastname: Lin
authors.affiliation: Department of Chemistry, University of California, Riverside, CA 92521 (USA) http://research.chem.ucr.edu/groups/feng/
authors.forename: Fei
authors.initials: F
authors.lastname: Bu
authors.affiliation: Department of Chemistry, University of California, Riverside, CA 92521 (USA) http://research.chem.ucr.edu/groups/feng/
authors.forename: Xitong
authors.initials: X
authors.lastname: Chen
authors.affiliation: Department of Chemistry and Biochemistry, California State University, Long Beach, CA 90840 (USA) http://www.csulb.edu/∼xbu/. xianhui.bu@csulb.edu.
authors.forename: Xianhui
authors.initials: X
authors.lastname: Bu
authors.affiliation: Department of Chemistry, University of California, Riverside, CA 92521 (USA) http://research.chem.ucr.edu/groups/feng/. pingyun.feng@ucr.edu.
authors.forename: Pingyun
authors.initials: P
authors.lastname: Feng
keywords: chromium(III); cooperative crystallization; indium; metal-organic polyhedra; proton conductivity