New phosphotetradecavanadate hybrids: crystal structure, DFT analysis, stability and binding interactions with bio-macromolecules.

Two novel bicapped Keggin polyoxidovanadates with organic cations, (CHN)[HPVO]·5HO (1) and (CHN)(NH)[HPVO]·11HO (2), (PVO = PV14, CHN = 3-picoline and CHN = methenamine) were synthesized. These compounds were isolated and characterized in the solid state and in solution by elemental analysis, powder X-ray diffraction, FTIR, UV-vis, V, P, C and H NMR, and fluorescence spectroscopy. Further confirmation of the PV14 structures was obtained by single-crystal X-ray diffraction studies of 1 and 2.

Activated Carbons from Hydrochars Prepared in Milk.

Hydrothermal carbonization converts organics in aqueous suspension to a mixture of liquid components and carbon-rich solids (hydrochars), which in turn can be processed into activated carbons. We investigated whether milk could be used as a medium for hydrothermal carbonization, and found that hydrochars prepared from milk, with or without an added fibrous biomass, contained more carbon (particularly aliphatic carbon), less oxygen, and more mineral components than those prepared from fibrous biomass in water. Activated carbons produced from hydrochars generated in milk had lower specific surface areas and CO capacities than those from hydrochars formed in water; however, these differences disappeared upon normalizing to the combustible mass of the solid.

Dawson-type polyoxometalate nanoclusters confined in a carbon nanotube matrix as efficient redox mediators for enzymatic glucose biofuel cell anodes and glucose biosensors.

Two new inorganic-organic hybrid materials based on heteropolyoxometalates (POMs): (CHN)[PMoO]·4HO (PMo) and (CHNO)[HPWO]·6HO (PW) are reported as mediators for electron transfer between FAD-dependent glucose dehydrogenase (FAD-GDH) and a multiwalled carbon nanotube (MWCNT) matrix for glucose biofuel cell and biosensor applications. These polyoxometalates were chosen due to their promising redox behavior in a potential range for mediated electron transfer with the glucose oxidizing enzyme, FAD-GDH. PMo and PW were immobilized on 1-pyrenemethylamine (PMA) functionalized MWCNT deposits.

A new sodium dimangnesium trivanadate, NaMg(2)V(3)O(10).

A single crystal of NaMg(2)V(3)O(10) has been prepared by solid-state reaction at 1173 K. The [Mg(2)(V(3)O(10))](-) anions are built up from edge-sharing MgO(6) octa-hedra to form [Mg(4)O(18)] units, which are linked to each other by trivanadate groups (V(3)O(10)). The Na(+) ions are located in the tunnel space.

Na(1.72)Mn(3.2)8(AsO(4))(3).

The single crystal of sodium manganese arsenate (1.72/3.28/12), Na(1.