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Synthesis, Crystal Structure and Magnetic Properties of [Mn(L)2(N(CN)2)2], a One-Dimensional Systems with End to End Single Dicyanamide Bridges (L=4-Cyanopyridine N-Oxide)

100%

Zhao Q. , Liu Y. Q. , Fang R.

Polish Journal of Chemistry

2004

tom Vol. 78 / nr 3

343-348

Anew 1-D polymeric coordination compound [Mn(L)2(N(CN)2)2] (L = 4-cyanopyridine N-oxide) has been synthesized and characterized. The crystal structure of this compound was determined by X-ray diffraction analysis. In the crystal structure, the [Mn(L)2]2+ units are linked by [N(CN)2]- _-bridging ligands to form one dimensional structure. The manganese ions display four coordination, with two terminal N atoms of different [N(CN)2]- ligands and twoOatoms of different 4-cyanopyridine N-oxide ligands. Analysis of variable temperature magnetic susceptibility (2-300 K) indicates that the polymer shows weak antiferromagnetic interaction.

TiO2 supported on SiO2 photocatalysts prepared using ultrasonic-assisted sol-gel method

88%

Yang X. L. , Liu C. J. , Liu Y. Q. , Li X. , Xu Y. H.

Materials Science Poland

2011

tom Vol. 29, No. 3

189--194

Guangdong TiO2-SiO2 (TiO2 supported on SiO2) photocatalysts were prepared using an ultrasonic-assisted sol-gel method. These photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and photoluminescence spectra (PL). Their photocatalytic activities were investigated by the method of methyl orange oxidation. It was found that the photocatalytic activity of TiO2-SiO2 was optimal when the molar ratio of hexadecyl trimethyl ammonium bromide to titanium butoxide was 1:10. The average crystallite size of TiO2-SiO2 was smaller than that prepared by the stirring method. Furthermore, for pure anatase phase samples, it was shown that the lower the photoluminescence intensity, the higher the photocatalytic activity.