Five organic–inorganic hybrids containing mixed–valence
multinuclear copper complexes and Keggin polyoxometalates, [CuI
5CuII
3(ptz)8(H2O)][HSiW12O40] (1), [CuI
10CuII
2(ptz)8(Cl)3][PW12O40] (2), [CuI
2CuII
4(ptz)6(OH)(H2O)2][PW12O40]·2H2O (3), CuI
2CuII
5(ptz)6(OH)2SiW12O40·6H2O (4), and [CuI
2CuII
5(ptz)6][PMoV
3MoVI
9O40]·8H2O (5) (ptz = 5-(2-pyridyl)-tetrazole), were hydrothermally
synthesized and structurally characterized. Compound 1 exhibits a three-dimensional (3D) network that features unprecedented
double chains consisting of tetranuclear Cu clusters. Compound 2 displays a 3D network that has unusual Cl-centered hexanuclear
Cu clusters and Cl-bridged tetranuclear Cu units. Compound 3 shows a 3D supramolecular network extended by two-dimensional (2D)
grid-like sheets which are composed of mixed-valence
multinuclear copper chains and PW12 polyanions. Isostructural
compounds 4 and 5 exhibit a 3D network consisting
of 2D ladder-like copper–ptz layers and SiW12 (PMo12 in 5) polyanions. The roles of copper ions
with different oxidation states and ptz ligands with different coordination
modes in the construction of the copper–ptz frameworks are
discussed. Their electrochemical properties were investigated as well.
By changing the polyoxoanions in the same metal-organic system (Ag/ptz), two novel inorganicorganic hybrids: [Ag 10 (ptz, are synthesized under hydrothermal conditions, and characterized by IR spectra, elemental analyses and single crystal X-ray diffraction. Compound 1 and 2 show 3D POMtemplated framework structures. In compound 1, a 2D layer is constructed by ''shield-like'' metalorganic circles templated by P 2 W 18 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.
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)).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.