A Series of Cube-Shaped Polyoxoniobates Encapsulating Octahedral Cu12XmOn Clusters With Hydrolytic Decomposition for Chemical Warfare Agents

Abstract

This study reported a series of cube-shaped polyoxoniobates, {MCu12O8)(Cu12XmOn)(Nb7(OH)O21)8} [M = Nb(1, 2), Ln3+(3), X = I(1, m = 3, n = 3; 2, m = 5, n = 1), Br(3, m = 5, n = 1)]. As the first octahedral Cu12XmOn cluster incorporated polyoxoniobate, the cube-shaped three-shell structure of {MCu12O8)(Cu12XmOn)(Nb7(OH)O21)8} polyanion contains a {MCu12O8} body-centered cuboctahedron, a {Cu12XmOn} octahedron and a {Cu12(Nb7(OH)O21)8} cube. Compounds 1, 2, 3 show effective catalytic activities for the hydrolytic decomposition of chemical warefare agent simulants.

Nb2O5, LiNbO3, and (Na, K)NbO3 Thin Films from High-Concentration Aqueous Nb-Polyoxometalates

“…Both Cu-{Nb 24 } and Ag-{Nb 24 } exhibit an intermediate size and a less pronounced structure factor (Table 1 and Figures S6 and S7). This suggests some polydispersities in these solutions, which is not surprising since Cu−{Nb 7 } POMs that include Cu-oxo polynuclear subunits 66 and numerous Ag-POM aggregates have been isolated. 67,68 Diluted solutions of NH 4 −{Nb 24 } and Ca−{Nb 24 } (also for thin film deposition studies, discussed below) showed diminution of the structure factor and confirmed the dominance of the {Nb 24 }-dimer and {Nb 24 }monomer, respectively, for all concentrations (Figure S8).…”

Metal-oxide clusters with semiconductive heterojunction counterparts

“…77 Different from the lacunary POMs, polyoxoniobates coordinate with the core clusters in a face-to-face manner. 64 [Co14(OH)16(H2O)8Nb36O106] 20− (denoted as {Co14Nb36}) was synthesized using {Nb6} and Co(NO3)2 as precursors through the hydrothermal method. A strong basic environment is required for handling polyoxoniobates and syntheses of this type of compound.…”