Department of Chemistry, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Korea.
Sensors (Basel). 2020 Jan 21;20(3):600. doi: 10.3390/s20030600.
Development of fluorescence-based sensory materials for metal elements is currently in the mainstream of research due to the simplicity and usability of fluorescence as a method of detection. Herein, we report a novel ""-quinoline-based acyl hydrazone-named bQH that could be synthesized by a facile, low-cost method through simple condensation of hydrazide with an aldehyde. This acyl hydrazone showed emissive properties through Zn selective binding, especially in its solid-state, as shown by experiments such as UV-Vis, photoluminescence (PL), nuclear magnetic resonance (NMR), and inductively-coupled plasma-optical emission spectroscopies (ICP-OES), and energy-dispersive X-ray spectroscopy (EDS) mapping. The binding modes in which bQH coordinates to Zn was proved to consist of two modes, 1:1 and 1:2 (bQH:Zn), where the binding mode was controlled by the Zn ion content. Under the 1:1 binding mode, bQH-Zn complexes formed a polymeric array through the metallo-supramolecular assembly. The resulting bQH-Zn complex maintained its fluorescence in solid-state and exhibited excellent fluorescence intensity as compared to the previously reported quinoline-based acyl hydrazone derivative (mQH).
由于荧光作为一种检测方法具有简单易用的特点，基于荧光的金属元素传感材料的开发目前是研究的主流。本文报道了一种新型的基于“-喹啉的酰腙，命名为 bQH，它可以通过简单的缩合反应，通过腙与醛的缩合，以简单、低成本的方法合成。该酰腙通过 Zn 的选择性结合表现出发光性能，特别是在固态下，如紫外-可见、光致发光（PL）、核磁共振（NMR）和电感耦合等离子体-发射光谱（ICP-OES）以及能量色散 X 射线光谱（EDS）映射实验所示。证明 bQH 与 Zn 的配位结合模式由两种模式组成，1:1 和 1:2（bQH:Zn），其中结合模式由 Zn 离子含量控制。在 1:1 结合模式下，bQH-Zn 配合物通过金属超分子组装形成聚合物阵列。所得的 bQH-Zn 配合物在固态中保持其荧光，并表现出与先前报道的基于喹啉的酰腙衍生物（mQH）相比优异的荧光强度。
