A High-Nuclear Isopolymolybdate Cluster Assembled with an Anionic [{Mo24 O48 (OMe)32 }]8- and Two Charge-Neutral [{Mo24 O52 (OMe)28 }] Cages.

Abstract

We synthesized a high-nuclear isopolymolybdate cluster (n-Bu4 N)6 H2 [{Mo24 O48 (OMe)32 }{Mo24 O52 (OMe)28 }2 ] ⋅ 25H2 O ⋅ 6CH3 CN (1) by using [Mo6 O19 ]2- as the base precursor. Crystallographic characterization shows the cluster is composed of an anionic [{Mo24 O48 (OMe)32 }]8- cage and two charge-neutral [{Mo24 O52 (OMe)28 }] cages. Supported by the electrospray ionization mass spectrometry study, the polyoxoanion structural unit [Mo24 O48 (CH3 O)27 ]3- demonstrates strong stability in acetonitrile solution. Moreover, 1 exhibits good proton conductivity of 1.79×10-3 S cm-1 at 358 K and 98 % relative humidity.