Liu Nan, Hao Juan, Chen Lili, Song Yonghai, Wang Li
Key Laboratory of Functional Small Organic Molecule, Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, China.
Luminescence. 2019 Mar;34(2):193-199. doi: 10.1002/bio.3593. Epub 2019 Jan 28.
Zeolitic imidazolate framework-8 (ZIF-8) loading rhodamine-B (ZIF-8@rhodamine-B) nanocomposites was proposed and used as ratiometric fluorescent sensor to detect copper(II) ion (Cu ). Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, nitrogen adsorption/desorption isotherms and fluorescence emission spectroscopy were employed to characterize the ZIF-8@rhodamine-B nanocomposites. The results showed the rhodamine-B was successfully assembled on ZIF-8 based on the π-π interaction and the hydrogen bond between the nitrogen atom of ZIF-8 and -COOH of rhodamine-B. The as-obtained ZIF-8@rhodamine-B nanocomposites were octahedron with size about 150-200 nm, had good water dispersion, and exhibited the characteristic fluorescence emission of ZIF-8 at 335 nm and rhodamine-B at 575 nm. The Cu could quench fluorescence of ZIF-8 rather than rhodamine-B. The ZIF-8 not only acted as the template to assemble rhodamine-B, but also was employed as the signal fluorescence together with the fluorescence of rhodamine-B as the reference to construct a novel ratiometric fluorescent sensor to detect Cu . The resulted ZIF-8@rhodamine-B nanocomposite fluorescence probe showed good linear range (68.4 nM to 125 μM) with a low detection limit (22.8 nM) for Cu combined with good sensitivity and selectivity. The work also provides a better way to design ratiometric fluorescent sensors from ZIF-8 and other fluorescent molecules.
提出了负载罗丹明 B 的沸石咪唑酯骨架材料 -8（ZIF-8@罗丹明 -B）纳米复合材料，并将其用作比率荧光传感器来检测铜离子（Cu²⁺）。采用扫描电子显微镜、傅里叶变换红外光谱、X 射线粉末衍射、氮气吸附/脱附等温线和荧光发射光谱对 ZIF-8@罗丹明 -B 纳米复合材料进行了表征。结果表明，基于 ZIF-8 的氮原子与罗丹明 -B 的 -COOH 之间的 π-π 相互作用和氢键，罗丹明 -B 成功组装在 ZIF-8 上。所制备的 ZIF-8@罗丹明 -B 纳米复合材料为八面体，尺寸约为 150 - 200 nm，具有良好的水分散性，在 335 nm 处表现出 ZIF-8 的特征荧光发射，在 575 nm 处表现出罗丹明 -B 的特征荧光发射。Cu²⁺ 可猝灭 ZIF-8 的荧光，而不是罗丹明 -B 的荧光。ZIF-8 不仅作为组装罗丹明 -B 的模板，还与罗丹明 -B 的荧光一起作为信号荧光，以构建一种新型的比率荧光传感器来检测 Cu²⁺。所得的 ZIF-8@罗丹明 -B 纳米复合荧光探针在检测 Cu²⁺ 时显示出良好的线性范围（68.4 nM 至 125 μM），检测限低（22.8 nM），且具有良好的灵敏度和选择性。该工作还为利用 ZIF-8 和其他荧光分子设计比率荧光传感器提供了一种更好的方法。
