A High‐Nuclear Isopolymolybdate Cluster Assembled with an Anionic [{Mo24O48(OMe)32}]8− and Two Charge‐Neutral [{Mo24O52(OMe)28}] Cages

Abstract We synthesized a high‐nuclear isopolymolybdate cluster (n‐Bu 4 N) 6 H 2 [{Mo 24 O 48 (OMe) 32 }{Mo 24 O 52 (OMe) 28 } 2 ] ⋅ 25H 2 O ⋅ 6CH 3 CN (1) by using [Mo 6 O 19 ] 2− as the base precursor. Crystallographic characterization shows the cluster is composed of an anionic [{Mo 24 O 48 (OMe) 32 }] 8− cage and two charge‐neutral [{Mo 24 O 52 (OMe) 28 }] cages. Supported by the electrospray ionization mass spectrometry study, the polyoxoanion structural unit [Mo 24 O 48 (CH 3 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.