Preparation and Characterization of Mesoporous Al-MCM-41 Layers Deposited on FeCrAl Metallic Foils by an In-situ Hydrothermal Method

A new class of activated mesoporous Al-MCM-41 layers was deposited on Fe-CrAl metallic foils in the presence of cationic surfactant cetyltrimethylammonium bromide under basic conditions by an in-situ hydrothermal method. The characterization techniques including X-ray diffraction, nitrogen adsorption and transmission electron microscopy, as well as field-emission scanning electron microscopy were performed to investigate the pore structure and surface morphology of the Al-MCM-41 layers. The Al-MCM-41 materials are of amorphous structure but exhibit large BET surface area （up to 757.0 m2/g） and pore volume （up to 0.72 cm3/g）, as well as a mean pore diameter of 3 nm. The layers deposited on the FeCrAl foils are continuous despite with a few of holes on the surface.

Synthesis, Crystal Structure and Photocatalytic Properties of a Supramolecular Assembly Based on Keggin Polyoxotungstate

A new supramolecular compound （4,4＇-bipyH）4[SiW12O40]（4,4＇-bipy） （4,4＇-bipy = 4,4＇-bipyridine） was synthesized hydrothermally and characterized by single-crystal X-ray diffraction and IR spectrum. The crystallography analysis for the title compound reveals that the crystal crystallizes in monoclinic, space group C2/m with a = 22.2767（12）, b = 21.1879（11）, c = 15.6942（8） A, β = 97.068（3）°, V = 7351.3（7） A3, Cs0H44N10040SiW12, Mr = 3659.24, Z = 4, Dc = 3.306 g/cm3, F（000） = 6544, GOOF = 1.137, R = 0.0577 and wR = 0.1579. The title compound consists of a discrete Keggin-type [SiWl2O40]4- anion, one 4,4＇-bipy and four protonated （4,4＇-bipyH）＋ cations. The [SiWl2O40]4- anion and protonated 4,4＇-bipy are connected to form a supramolecular structure by hydrogen bonds. Meanwhile, the title compound exhibits good photocatalytic activity for color degradation of Rhodamine-B dye solution under visible-light irradiation.

One New Zinc Coordination Polymer Based on 2-Chloro-benzoate and 4,4'-Bipyridine: Synthesis, Crystal Structure and Luminescence

A Zn-based coordination polymer [Zn（2-cb）2（4,4′-bpy）0.5]n （1, 2-cb = 2-chloro- benzoate, 4,4＇-bpy = 4,4′-bipyridine） was prepared by hydrothermal synthesis using 2-chloro- benzoic acid and 4,4′-bipyridyl as ligands. The compound was characterized by elemental analysis, IR, TGA, and X-ray single-crystal diffraction. The crystal belongs to the monoclinic system, space group PI with a = 8.0471（5）, b = 9.7338（6）, c = 11.7830（7） A, a = 96.2230（10）, β = 92.542（2）, γ = 103.7560（10）°, V = 888.84（9） A3, Z = 2, Mr = 454.57, Dc = 1.698 g/cm3,μ（MoKa） = 1.708 mm.1, F（000） = 458, the final R = 0.0359 and wR = 0.0936 for 3167 observed reflections with I 〉 2σ（I）. The crystal analysis indicates that 1 exhibits a 1-D chain structure constructed by 4,4′-bpy and a dicaryon secondary-building-unit of [Zn2（2-cb）4]. Luminescence analysis revealed that compound 1 emits blue fluorescence with a fluorescence lifetime of 55.03 ns.