Bisodium-substituted vanadium oxide cluster with encapsulated [VO4]4− core and its electrochemical property

A new hybrid compound [Cu(en)2]4[Na2VV14VIV2O42(VIVO4)]·2H2O (1) (en = ethylenediamine) has been hydrothermally synthesized. Single-crystal structural analysis indicates that compound 1 contains a novel bisodium-substituted [Na2V16O42(VO4)]8− cluster (abbreviated as Na2V16) with an encapsulated [VO4]4− core. The Na2V16 cluster exhibits a eight-connected model by providing eight terminal O atoms to link eight [Cu(en)2]2+ units, generating a three-dimensional (3D) network with 412·63 topology. Furthermore, the electrochemical property of 1 has been studied.