信息来源： 发布日期: 2018-06-25浏览次数:

题 目: Aggregation of Giant Cerium-Bismuth Tungstate Clusters into a 3D Porous Framework with High Proton Conductivity

作 者: Jian-Cai Liu, Qing Han, Li-Juan Chen, Jun-Wei Zhao,* Carsten Streb* and Yu-Fei Song*

刊 名: Angew. Chem. Int. Ed

年卷页: 2018, 57, 1-5

影响因子：11.994

摘 要：The exploration of high nuclearity molecular metal oxide clusters and their reactivity is a great challenge for chemistry and materials science. Here, we report an unprecedented giant molecular cerium-bismuth tungstate superstructure formed by self-assembly from simple metal oxide precursors in aqueous solution. The compound, {[W₁₄Ce^IV₆O₆₁]([W₃Bi₆Ce^III₃(H₂O)₃O₁₄][B-α-BiW₉O₃₃]₃)₂}^34- was identified by single crystal X-ray diffraction and features 104 metal centres, a relative molar mass of ~24,000 and is ca. 3.0 x 2.0 x 1.7 nm³ in size. The cluster anion is assembled around a central {Ce₆}octahedron which is stabilized by several molecular metal oxide shells.Six trilacunary Keggin anions ([B-α-BiW₉O₃₃]^9-) cap the superstructure and limit its growth. In the crystal lattice, water-filled channels with diameters of ca. 0.5 nm are observed, and electrochemical impedance spectroscopy shows pronounced proton conductivity even at low temperature. The study therefore opens new bottom-up design routes to functional metal oxide materials based on giant polyoxometalate building blocks.

文章链接：https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201803649.