Novel Layered Zn-Y Hydroxide and Study of Their UV Properties by Intercalation of Organic Aliphatic and Aromatic UV-Absorbent Molecules

摘要

The layered Zn-Y hydroxides containing succinate, adipate, sebacate and benzoate as inter layer anions were synthesized with the objective of integrating organic molecules with inorganic structures to produce hybrid materials where in the advantages of both the components can be retained in one material. The structures were characterized by various analytical techniques such as PXRD, FTIR and TGA techniques. The optical characteristics of these samples were evaluated using UV-visible and PL spectroscopic techniques. While the monolayer arrangement within the interlayer could be conceived for succinate, adipate and sebacate from their PXRD patterns and FTIR spectra, presence of tilted bilayers of benzoate in the interlayer between Zn-Y hydroxides was identified. The interlayer separation of the intercalated samples varied linearly with the number of -CH_2 groups, n, in the aliphatic chain of dicarboxylates. Intercalated samples showed higher thermal stability as compared to acetate intercalated system. In addition to the π-π* transitions from carboxylates, surface defects of Zn-Y hydroxide system was observed as luminescence emission in the visible region of the spectrum.