作者:Da-Yu Wu、Li-Xia Xie、Chang-Li Zhang、Chun-Ying Duan、Yong-Gang Zhao、Zi-Jian Guo
DOI:10.1039/b605653a
日期:——
New selective Zn2+ fluorescent sensors, di(2-quinoline-carbaldehyde)-2,2′-bibenzoyl-hydrazone (QB1) and di(2-quinolinecarbaldehyde)-6,6′-dicarboxylic acid hydrazone-2,2′-bipyridine (QB2), have been designed and prepared. Both QB sensors exhibit an emission band centered at 405 nm (excitation at 350 nm) with low quantum yield. Zinc binding not only red-shifts the emission band to 500 nm, but also enhances the fluorescence intensity by an order of magnitude based on the deprotonization strategy via self-assembly. These probes are highly selective for Zn2+ over biologically relevant alkali metals, alkaline earth metals and the first row transition metals such as Mn2+, Fe2+, Co2+ and Ni2+ in buffered aqueous DMSO solution.
我们设计并制备了新型选择性 Zn2+ 荧光传感器--二(2-喹啉-甲醛)-2,2′-联苯甲酰基腙(QB1)和二(2-喹啉-甲醛)-6,6′-二羧酸腙-2,2′-联吡啶(QB2)。这两种 QB 传感器都显示出以 405 纳米为中心的发射带(激发波长为 350 纳米),但量子产率较低。通过自组装的去质子化策略,锌结合不仅能将发射带红移到 500 纳米,还能将荧光强度提高一个数量级。在缓冲 DMSO 水溶液中,这些探针对 Zn2+ 具有高度选择性,而对生物相关的碱金属、碱土金属和第一排过渡金属(如 Mn2+、Fe2+、Co2+ 和 Ni2+)则没有选择性。