Thiourea‐ and Amino‐Substituted Benzoxadiazole Dyes with Large Stokes Shifts as Red‐Emitting Probe Monomers for Imprinted Polymer Layers Targeting Carboxylate‐Containing Antibiotics
作者:Virginia Valderrey、Kornelia Gawlitza、Knut Rurack
DOI:10.1002/chem.202104525
日期:2022.4.12
core. Concerted charge transfer in this electron donor-acceptor-donor architecture endows the dyes with strongly Stokes shifted (up to >250 nm) absorption and fluorescence. Binding of electron-rich carboxylate guests at the thiourea receptor leads to further analyte-induced red-shifts of the emission, shifting the fluorescence maximum of the complexes to ≥700 nm. Association constants for acetate are
描述了基于苯并恶二唑 (BD) 发色团的双功能荧光分子含氧阴离子探针,其在 BD 核心的 4,7 位上整合了硫脲结合基序和可聚合的甲基丙烯酸 2-氨基乙酯单元。这种电子供体-受体-供体结构中的协同电荷转移赋予染料强烈的斯托克斯位移(高达 >250 nm)吸收和荧光。富含电子的羧酸客体与硫脲受体的结合导致分析物引起的发射进一步红移,将复合物的荧光最大值移动到≥700 nm。乙腈中乙酸盐的缔合常数范围为 1-5×105 M-1。将其中一种荧光探针通过其可聚合部分整合到从亚微米二氧化硅核心表面接枝的分子印迹聚合物(MIP)中,产生了荧光 MIP 涂层颗粒探针,用于选择性检测含有脂肪族羧酸酯基团的抗生素,例如依诺沙星(ENOX)。高极性溶剂(如乙腈)中的微摩尔浓度。