Heterostructured Tin oxide-pillared tetratitanate with enhanced photocatalytic activity.

An effective active heterostructured photocatalyst of porous SnO(2)-pillared tetratitanate nanocomposite is synthesized by assembling tetratitanate nanosheets with SnO(2) nanoparticles via an exfoliation-restacking route. The nanocomposite was characterized by powder X-ray diffraction, high-resolution transmission electron microscope, thermogravimetric analysis, UV-vis DRS, X-ray photoelectron spectroscopy, and N(2) adsorption-desorption measurements. It was found that the pillared nanaocomposite is mesoporous with a gallery height of about 2 nm and a specific surface area of 154 m(2)/g. The pillared nanaocomposite exhibited enhanced photocatalytic activity in the photodegradation of Rhodamine B under UV light irradiation. The improved performance is attributed to the electronic coupling between the host and the guest components, as well as its high surface area and mesoporosity.

Fe-doped and ZnO-pillared titanates as visible-light-driven photocatalysts.

Fe-doped cesium titanate was obtained by a solid state reaction with a mixture of Cs(2)CO(3), TiO(2), and Fe(2)O(3). ZnO-pillared doped titanate nanocomposite was successfully fabricated by exfoliating doped titanate and restacking its nanosheets with ZnO nanoparticles. The resulting nanocomposite was characterized by powder X-ray diffraction, scanning electron microscope, X-ray photoelectron spectroscopy, N(2) adsorption-desorption measurement, thermogravimetric analysis and UV-vis spectroscopy. It was revealed that the present nanocomposite exhibits greatly increased specific surface area with mesoporous texture and that there exists an electronic coupling between the host sheets and the guest nanoparticles in the pillared system. The results of degradation of methylene blue under visible light radiation suggest that doping iron ions improves the material spectral response region and that hybridizing with ZnO nanopillars can suppress the recombination of photogenerated electron-hole pairs.

Preparation and electrical conductivity of polypyrrole/WS2 layered nanocomposites.

Lithium intercalated tungsten disulfide Li(x)WS(2) with x>1 was solvothermally obtained. It was revealed that Li(x)WS(2) can remain mostly unchanged under vacuum (about 4 kPa) for 5 days. The pH dependences of surface zeta potential for single molecular layers of WS(2) were determined, illustrating that its isoeletric point is approximately at pH 3. The polypyrrole/WS(2) layered nanocomposites were prepared via the combination of the exfoliation-restacking technique and in situ oxidative polymerization. The intercalation of PPy into the host galleries resulted in an interlayer expansion of about 3.7 A, which suggested that the intercalated polymeric chains are in a monolayer arrangement with the pyrrole rings lying parallel to the WS(2) host layers. The resulting material shows good thermal stability with the decomposition of the interacted chains within the disulfide galleries occurring at around 400 degrees C. The electrical conductivity of PPy/WS(2) nanocomposite was found to be high in the order of 10(-2) S cm(-1) at ambient temperature.

Poly[propane-1,3-diammonium [tetra-micro3-oxo-hexaoxotrimolybdenum(VI)] dihydrate].

The crystal structure of the title compound, [(C(3)H(12)N(2))[Mo(3)O(10)].2H(2)O](n), is composed of [Mo(3)O(10)](2-) anionic chains, propane-1,3-diammonium cations and solvent water molecules. The [Mo(3)O(10)](2-) chain is constructed from edge-sharing MoO(6) octahedra. The protonated propane-1,3-diamine cations and solvent water molecules are located between the chains and are linked to the O atoms of the inorganic chains by hydrogen bonds.

Tris(ethylenediamine)zinc(II) molybdate(VI), [Zn(en)3][MoO4].

The crystal structure of the title compound, [Zn(C2H8N2)3][MoO4], is composed of [MoO4]2- anions and [Zn(en)3]2+ complex cations (en is ethylenediamine), both with symmetry 2, which are held together in a three-dimensional network via hydrogen-bonding interactions. The [Zn(en)3]2+ cations in the crystal structure exhibit two configurations, viz. Lambda(deltadeltadelta) and Delta(lambdalambdalambda), as a pair of enantiomers.

Synthesis, structure, and magnetism of a ferric 24-azametallacrown-8 complex.

A new pentadentate N-isobutyrylsalicylhydrazidate ligand (H(3)ibushz, C(11)H(14)N(2)O(3)) and a self-assembly synthesis of the first 24-azametallacrown-8, [Fe(8)(C(11)H(11)N(2)O(3))(8)(CH(3)OH)(8)].0.5CH(2)Cl(2).7.5CH(3)OH.3.5H(2)O, have been reported. Eight Fe(III) ions and eight deprotonated ibushz(3)(-) ligands construct a planar 24-membered ring based on the M-N-N-M linkage. The chiralities of the iron atoms on the 24-azametallacrown-8 ring alternate between the Lambda and Delta forms. The title octanuclear azametallacrown has no crystallographic centrosymmetry, while all the known metallacrowns and azametallacrowns with an even nuclear number have crystallographic centrosymmetry. The study of (1)H NMR spectra suggests that the title compound retains its metallacrown structure in solution at room temperature over a period of at least three months. There exists a strong antiferromagnetic exchange interaction between the iron paramagnetic centers.

Tetraaquacobalt(II) bis[vanadyl(IV) phosphate], [Co(H(2)O)(4)][VO(PO(4))](2).

The structure of [Co(H(2)O)(4)][VO(PO(4))](2) is composed of [VO(PO(4))] layers and interlayer tetrahydrated Co(2+) ions. Alternating VO(5) square pyramids and PO(4) tetrahedra share O-atom vertices, thus forming the vanadyl phosphate layers. Two vanadyl oxo groups from neighbouring layers are coordinated to each Co atom in a trans fashion, with Co-O distances of 2.157 (4) A, thus generating a three-dimensional framework structure.

First hexadecavanadate compound: hydrothermal synthesis and characterization of a three-dimensional framework [(Cu(1,2-pn)2)7(V16O38(H2O))2].4H2O.

The hydrothermal reaction of V2O5, Cu(CH3COO)2.H2O, 1,2-diaminopropane and [N(CH3)4]OH yields the novel three-dimensional open-framework solid [(Cu(1,2-pn)2)7-(V16O38(H2O))2].4H2O constructed from the new mixed-valence [V16O38(H2O)]7- clusters interconnected through mu 2-[Cu(1,2-pn)2]2+ groups.

Layered (ethylenediamine-kappa2N,N')cobalt(II) molybdate(VI).

The structure of poly[[(ethylenediamine-kappa2N,N')cobalt(II)]-mu-tetraoxomolybdato(VI)], [Co(C(2)H(8)N(2))MoO(4)](n) or [CoMoO(4)(C(2)H(8)N(2))](n), is composed of puckered layers constructed from MoO(4) tetrahedra and CoN(2)O(4) octahedra, with the ethylenediamine ligand coordinated to the Co atom in a cis fashion. Each pair of cobalt sites forms a binuclear edge-sharing unit through a (Co(2)O(2)) interaction. The binuclear octahedral units are interconnected through the bridging MoO(4) tetrahedra into a layer structure.