科研之友
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摘要
This paper demonstrates a systematic study of the synthesis and characterization of the hybrid of Mg-Al layer double hydroxides (LDHs), poly(epsilon-caprolactone) (PCL), and terbium ions (Tb3+). The hybrid LDH-g-PCL-Tb3+-1,10-phenanthroline (Phen) was prepared by the combination of ring opening polymerization (ROP), click chemistry, and coordination chemistry. First, LDHs with a molar ratio of Mg/Al = 2 were prepared by the co-precipitation method, which was subsequently functionalized with (3-chloropropyl) trimethoxysilane in order to introduce azide groups through the reaction of chlorine with sodium azide. Meanwhile, the acetylene functionalized PCL was prepared by ROP of epsilon-CL, followed by esterification of the hydroxyl groups using succinic anhydride. The click reaction of alkyne-PCL and N-3-LDHs successfully afforded LDH-g-PCL, which was coordinated with Tb3+ ions in the presence of Phen. The structure and properties of the nanohybrids were investigated by FT-IR, XPS, EDS, SEM, and TGA analyses. The data indicate the coordination of Tb3+ ions with LDH-g-PCL nanohybrids. The content of Tb3+ ions in the LDH-g-PCL-Tb3+-Phen complex was calculated to be 8.7% (w/w). The LDH-g-PCL-Tb3+-Phen complexes showed four emission bands with high fluorescence intensity centered at 489 nm (D-5(4) -%26gt; F-7(6)), 546 nm (D-5(4) -%26gt; F-7(5)), 586 nm (D-5(4) -%26gt; F-7(4)) and 623 nm (D-5(4) -%26gt; F-7(3)) with excitation at 328 nm (F-3(6) -%26gt; (5)G(6)). The stability of LDH-g-PCL-Tb3+-Phen complexes under UV irradiation was high, and no leaching effect was observed.
- 出版日期2014-1-5
