Two distinct manganese molybdenum(V) phosphates directed by different organic amines

By employing different organic amines as structure-directing agents, two new distinct 3D porous inorganic frameworks based on molybdenum(V) phosphates and MnII, (H2en)2{[Mn(H2O)]2[MnMo12O24(OH)6(H2PO4)2(HPO4)4(PO4)2]}·7H2O (en = ethylenediamine) (1) and (H3dien)2{[Mn(H3O)2][Mn3Mo12O24(OH)6(HPO4)2(PO4)6]}·5H2O (dien = diethylenetriamine) (2), have been hydrothermally synthesized, and characterized by routine physical methods. In compound 1, MnII all adopt octahedral coordination mode and each sandwich cluster Mn[Mo6P4O31]2 (abbreviated as Mn[Mo6P4]2) acts as an octa-dentate ligand linking eight MnII, which result in a 3D inorganic (4, 8)-connected framework with the (46)(410·612·86) topology. Compound 2 shows a 3D (4, 10)-connected framework with the (31·44·61)(34·49·57·617·74·84) topology, in which MnII ions exhibit both tetrahedral and octahedral coordination modes, and each Mn[Mo6P4]2 links ten MnII. Interestingly, there exist channels along the a and b axes in 1, while along the a and c axes in 2. The differences between the two compounds should be ascribed to the distinctions of the organic amines. Primary de-/rehydration behaviors and electrochemistry properties have also been studied for the two compounds.

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