Preparation of a Mg²⁺-containing MOF through ion exchange and its high ionic conductivity

Abstract

We first report on preparation and ionic conductivity of a Mg2+-included metal–organic framework (MOF) having Type A feature, i.e., anionic framework including Mg2+ as counter cations. We prepared Mg3[(MnMo6O18)2L] (L12–...

High ionic conduction in a robust anionic metal–organic framework containing Mg2+ under guest vapors

“…4 shows the temperature dependence of ionic conductivity under various guest vapors of small organic molecules or dry N 2 . As with a previous report (MOF-688-Mg), 9 SU-102-Mg exhibited insulating character under dry N 2 , clearly indicating that Mg 2+ located in the pores are strongly bound by the framework and thus cannot be migrated. Conversely, small guest molecules such as MeOH and MeCN drastically enhance its ionic conductivity.…”

“…The result suggested that the crystalline pores or regular channels of SU-102-Mg deeply contribute to the efficient migration of the included Mg 2+ . As listed in Table S1, † the activation energy of SU-102-Mg under each guest is also similar to that of MOF-688-Mg, 9 suggesting the similar conducting mechanisms under the guest vapors.…”

“…, high transport number), only one compound, MOF-688-Mg, which exhibits low crystallinity, has been reported to date. 9 Because its conductivity (1.3 × 10 −5 S cm −1 , 25 °C) 9 is still much lower than that of Type B compounds ( e.g. , MIL-101⊃{Mg(TFSI) 2 } 1.6 : 1.9 × 10 −3 S cm −1 , 25 °C), 7 the further development of Type A compounds is highly desired.…”