Preparation and characterization of a novel strong-fluorescent hydrotalcite-like compound (Al-HTLc)

Preparation and characterization of a novel strong-fluorescent hydrotalcite-like compound (Al-HTLc)

作者：; 作者机构：; 来源：中国科学 年：2008 卷：000 期：009

页码：P.834-841 页数：8

中图分类：O611.3 正文语种：CHI

关键词：hydrotalcite-like;compound;8-hydroxyquinoline;aluminum;intercalation;assembly;supramolecule;fluorescence;fluorescent;lifetime

摘要：A novel strong-fluorescent hydrotalcite-like compound (Al-HTLc) was synthesized by coprecipitation. In the sample, the content of aluminum(III) in the layers was decreased to a proper value. The Al3+ ions coordinated with 8-hydroxyquinolines (8-HQ) which were dispersed into the anions in the interlayer region. The sample was characterized by XRD, XPS, FT-IR, TG-DSC, UV-Vis, and fluorescence spec- troscopy; its composition and structure were also determined. The results indicate that the sample can emit fluorescence (487 nm) with a strong fluorescence intensity (4.9×105 (a.u.)). The fluorescent lifetime and fluorescence quantum yield of Al-HTLc were measured to be 21.24 ns and 67%, respectively, higher than those of pure 8-hydroxyquinoline

aluminum (Alq3). The result of TG-DSC measurement clearly shows the enhanced thermal stability of Al-HTLc compared with that of MgAl-LDH and pure Alq3. Al-HTLc may be used as a novel luminescent functional material.