Add time:07/18/2019         Source:sciencedirect.com

An organic UV absorber, cinnamic acid, was intercalated into the interlayer gallery of layered yttrium hydroxynitrate (LYH) via the anion-exchange reaction. The complete replacement of interlayer nitrate by cinnamate was confirmed by thermogravimetric analysis of the obtained intercalation compound (cin-LYH). FT-IR spectra and powder X-ray diffraction patterns before and after intercalation reaction of LYH provided an information on the interaction of cinnamate anions with the inorganic host layer. Measured chemical composition and interlayer distance of cin-LYH and van der Waals dimensions of cinnamate proposed partially interdigitated bilayer arrangement of cinnamate anions in the interlayer space of LYH. The intercalation of cinnamate into the inorganic LYH layers highly improved its thermal stability in comparison with pure cinnamic acid. The comparison of reflectance spectra of pure cinnamic acid and cin-LYH before and after exposure to solar-simulated radiation showed that the trans- to cis- photoisomerization of cinnamate accompanied with a significant change of the molecular packing is not facilitated in the interlayer space of LYH. In contrast, only a slight variation in width and position of absorption band indicated no strong interaction between aromatic groups of cinnamate in the interlayer space of LYH. Quartz glasses coated with cin-LYH could be readily obtained by a simple dip-coating method in colloidal solutions and showed effective UV-filtering ability particularly in UV-B region (280–320 nm) without significant loss of the transparency of quartz glass. The release studies revealed that the interlayer space of LYH is effective for the retention of cinnamate for long time and this release reaching an equilibrium state at low concentration is suitable for long-term UV-screening service.

We also recommend Trading Suppliers and Manufacturers of zinc cinnamate (cas 18957-59-0). Pls Click Website Link as below: cas 18957-59-0 suppliers