High Proton Conductivity by a Metal–Organic Framework Incorporating Zn<sub>8</sub>O Clusters with Aligned Imidazolium Groups Decorating the Channels
作者:Susan Sen、Nisanth N. Nair、Teppei Yamada、Hiroshi Kitagawa、Parimal K. Bharadwaj
DOI:10.1021/ja3076378
日期:2012.11.28
A novel Metal organic framework (Zn-0.25)(8)(O)}Zn-6(L)(12)(H2O)(29)(DMF)(69)(NO3)(2)](n) (1) H2L = 1,3-bis(4-carbcixYphehyl)imidaiolitirn}, has been synthesized. under solvothermal conditions in good yield. It shows a Zn-80, cluster that is coordinated to six ligands and forms an overall three-dimensional structure with channels along the crystallographic a and b axes. The imidazolium groups of the ligand Moiety are aligned in the channels., The channels are not.. empty but are occupied by a large number of DMF and water Molecules: Upon heating these Solvent molecules can be removed withont:breakdown,of the overall structure of the framework as shown by variable temperature powder X-ray diffraction patterns. Of great interest is the fact that the compound exhibits high proton conductivity with a low activation energy that is comparable to those of Nafion presently used in fuel cells.