Cuili Meng

Polyoxoanion-enveloped Ag/ptz inorganic–organic hybrid system: From a single to a double template

By changing the polyoxoanions in the same metal–organic system (Ag/ptz), two novel inorganic–organic hybrids: [Ag10(ptz)5(HP2W18O62)(H2O)4]·2H2O (1), [Ag7(ptz)5(H2SiW12O40)(H2O)] (2) (ptz = 5-(4-pyridyl)-tetrazolate), are synthesized under hydrothermal conditions, and characterized by IR spectra, elemental analyses and single crystal X-ray diffraction. Compound 1 and 2 show 3D POM-templated framework structures. In compound 1, a 2D layer is constructed by “shield-like” metal–organic circles templated by P2W18 polyoxoanions, which is extended to a 3D structure by covalent bonds in an interdigital mode. In compound 2, a 3D network is constructed by 2D layers and a “double bridge-pillar”, the Keggin polyoxoanion templates are enveloped in pairs in nanocages. The influences of polyoxoanion templates on the frameworks are discussed. The electrochemical behavior and luminescent properties for compound 1 and 2 are investigated.

Preparation and application of multiple-component-doped keggin polyoxometalate microtubes--towards a component-tunable hollow structure.

In this paper, the preparation of ascorbic acid (AA)-doped polyoxometalate (SiW(12)-AA) microtubes is described. The SiW(12)-AA microtubes convert to heteropoly blue microtubes upon exposure to ammonia gas, which is an ammonia-triggered solid-solid redox reaction between AA molecules and polyoxometalates, and can possibly be applied to a chemical sensor for detecting ammonia and volatile organic amines. Furthermore, the SiW(12)-AA microtubes have been applied to the in situ synthesis of Ag nanoparticles (NPs) through the redox reaction between the AA component and Ag(+) ions occurring on the surfaces of the SiW(12)-AA microtubes to give silver NPs immobilized on polyoxometalate microtubes (Ag@SiW(12)).

Fabrication and Characterization of LuminescentMultilayer Films Based on Polyoxometalates and Fuchsin Basic

A luminescent multilayer film has been fabricated from the polyoxometalate anion α- [PMo12O40]3− (α-PMo12) and the cation Fuchsin Basic (FB) through an electrostatic layer-by-layer (LbL) self-assembly method and characterized by UV/Vis spectra, atomic force microscopy and X-ray photoelectron spectra. The fluorescence properties of the LbL film have also been investigated. Cyclic voltammetry measurements have demonstrated that the electrochemical properties of the polyoxometalate and FB are maintained in the multilayer film, which exhibits electrocatalytic activity for the reduction of bromate Graphical Abstract Fabrication and Characterization of LuminescentMultilayer Films Based on Polyoxometalates and Fuchsin Basic

Synthesis and Characterization of Fluorescent Polyoxometalate Nano-/Microrods

Fluorescent nano-/microrods of the polyoxometalate (POM) K4H[Eu(α-SiW11O39)- (H2O)2] ・ 17H2O were obtained in aqueous solution by a conventional synthesis method. The nano-/microrods have been characterized by elemental analysis and FT-IR, UV/Vis, and TG-DTA data, and their morphology was examined by ESEM-FEG, showing that the average ratio of diameter to length is 1 : 20. The obtained nano-/microrods exhibit a regular profile and an intense fluorescence. Graphical Abstract Synthesis and Characterization of Fluorescent Polyoxometalate Nano-/Microrods