The Structure Control And Properties Of Azo Dye Intercalation Material

Azo Compounds with its unique optical properties, the characteristics of N=N double bond and cis-trans isomerization, were wildly used in molecular devices, optical information storage, molecular imprinting and so on. There is a variety of azo compounds poor thermal stability of light, while likely to cause environmental pollution problems. How to use these dyes more efficiency and reduce the pollution of its cost at the same time become to a hot topic. Hydrotalcite-like compounds have stacked layers of laminated structure, Using this structure to solve the problem azo compounds become an important part of the study.In this paper, the structural characteristics and the preparation methods of the azo dyes LDHs were studied from the experimental point of view. By the way of theoretical calculation, we optimized the geometry of azo dyes LHDs, which consistent with the experimental results well. The Zn/Al-mordant yellow 10 (MY10)-LDHs was successful prepared by ion exchange method, and the acid orange 7 (AO7)-pillared Zn/Al layered double hydroxides were successfully synthesized with both the coprecipitation method and ion exchange method. In this experiment, many synthetic parameters, such as the temperature, the pH values and the ratios of the raw materials, total reaction time had been separately varied in order to study their influences to the structure of LDHs. The characterization of samples was carried out by x-ray diffraction (XRD), thermal analysis (TG-DTA) and Fourier transform infrared (FT-IR), which confirm the most appropriate conditions of the experiment. And thermal stability was increased after azo intercalation into the LDHs. The geometries of AO7-LDH were calculated by quantum chemistry method and the gallery heights were 2.33 nm at B3PW91/6-31G (d, p) level, which agreed well with experiment results. For a further study on the structural characteristics of the LDHs, Formamide was chosen as the solvent in the experiment of delamination of layered double hydroxides. The XRD pattens showed the characterization of samples, the reaction mechanism of delamination experiment was discussed.