(meso-5,5,7,12,12,14-Hexamethyl-1,4,8,11-tetra-aza-cyclo-tetra-deca-ne)nickel(II) bis-[O,O'-(1,2-phenyl-ene) dithio-phosphate].

In the crystal structure of the title compound, [Ni(C(16)H(36)N(4))](C(6)H(4)O(2)PS(2))(2), the Ni(II) cation is located on a center of inversion and is chelated by the folded tetra-amine macrocycle ligand in a slightly distorted NiN(4) square-planar geometry. Two symmetry-related O,O'-(1,2-phenyl-ene)dithio-phosphate anions are located on either side of the Ni(II) cation, with Ni⋯S of 3.9558 (5) Å, and link to the tetra-amine macrocycle ligand via N-H⋯S hydrogen bonding.

Tris(1,10-phenanthroline)cadmium 3,3'-dicarb-oxy-4,4'-diazenedi-yl-dibenzoate-4,4'-diazenediyldiphthalic acid-methanol (1/0.5/1).

In the title compoud, [Cd(C(12)H(8)N(2))(3)](C(16)H(8)N(2)O(8))·0.5C(16)H(10)N(2)O(8)·CH(3)OH, the Cd(II) atom has a distorted octa-hedral coordination formed by six N atoms from three separate phenanthroline ligands. One of the 4,4'-diazenediyldiphthalic acid mol-ecules is arranged around an inversion center and possesses two -COOH groups, while the other is partially deprotonated and is a dianion for charge balance. It can be noted that, in the undeprotonated acid, the -COOH groups are disordered over two positions by rotation around the C-C bond linking the -COOH group to the phenyl ring. Surprisingly, the H atom is not involved in the disorder. In the dianion, the remaining H atom is located between the two COO groups. These deprotonated and undeprotonated mol-ecules are linked by O-H⋯O hydrogen bonds, forming a chain developing parallel to the [111] direction. The methanol solvent molecule is highly disordered; it was not considered in the final model by elimination of its contribution from the intensity data.

Bis(4'-hy-droxy-biphenyl-4-carboxyl-ato-κO)(1,10-phenanthroline-κN,N')zinc.

In the title compound, [Zn(C(13)H(9)O(3))(2)(C(12)H(8)N(2))], the Zn(II) atom is located on a twofold rotation axis and has a distorted tetra-hedral coordination with two N atoms from the phenanthroline ligand arranged around the twofold axis and two O atoms from two symmetry-related 4'-hy-droxy-biphenyl-4-carboxyl-ate ligands. The mol-ecules are linked by O-H⋯O hydrogen bonds, forming a chain developing parallel to [101].

Characterization and photocatalytic property of Pd/TiO2 with the oxidation of gaseous benzene.

Increasing environmental pollution caused by the volatile organic compounds due to their toxicity is a matter of great concern. So it is crucial to develop processes which can destroy these compounds effectively. It has been found that the photocatalytic activity of TiO(2) towards the decomposition of gaseous benzene can be greatly enhanced by loading Pd on the surface of TiO(2). The results show that the optimum palladium loading is 0.25wt.%. The prepared photocatalysts were characterized by XRD, UV-vis diffuse reflectance and XPS. XRD results indicate that no peaks of Pd are detected in the 2theta region from 10 degrees to 90 degrees . Pd/TiO(2) absorbs much more light than TiO(2) in the visible light region. The XPS spectrum shows that there are Ti, O, C and Pd elements on the surface of the Pd/TiO(2), the binding energy values of Ti2p of 0.25%Pd/TiO(2) transfer to a lower value. In addition, the photocatalytic performance of 0.25%Pd/TiO(2) was investigated, the result illustrates that 0.25%Pd/TiO(2) demonstrates 2.32 times the photocatalytic activity of pure TiO(2). The reason of promotion of photocatalytic performance was discussed.