Division of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Chennai 600127, India.
Division of Chemistry, School of Advanced Sciences, Vellore Institute of Technology, Chennai 600127, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2023 Sep 5;297:122696. doi: 10.1016/j.saa.2023.122696. Epub 2023 Apr 7.
The self-assembly behaviour of a newly synthesized amphiphilic core-positioned thioester appended with carboxylic acid functionalized perylene diimide derivative is studied in different organic solvents. Fluorescent J-type hemispherical aggregates are formed in THF solution. The effect of added metal ions on these fluorescent aggregates is evaluated using spectroscopic techniques, where we found these probes bind selectively to Fe and Ba ions. Two equivalents of Fe ions bind cooperatively to one equivalent of perylene diimide derivative in the hemispherical aggregates with a binding constant of 1.4×10 M and the limit of detection (LOD) was calculated to be 8.66×10 M. The positive cooperative binding effect of Fe ions towards hemispherical aggregates equipped with perylene diimide derivatives leads to supramolecular polymerization. Ba ions showed selectivity and sensitivity towards the fluorescent aggregates in THF by quenching the fluorescence intensity completely. The linear Stern-Volmer plot with a Stern-Volmer constant value of 502.6 M signifies the heavy atom effect of Ba ions, leading to fluorescence quenching. The morphological transformation of the fluorescent J-type hemispherical aggregates in the presence of Fe and Ba was studied in detail using electron microscopy.
一种新合成的两亲性核心位置硫酯与羧酸功能化苝二酰亚胺衍生物的自组装行为在不同有机溶剂中进行研究。在 THF 溶液中形成荧光 J-型半球形聚集体。使用光谱技术评估添加的金属离子对这些荧光聚集体的影响，我们发现这些探针选择性地与 Fe 和 Ba 离子结合。两个当量的 Fe 离子以协同方式与半球形聚集体中的一个当量的苝二酰亚胺衍生物结合，结合常数为 1.4×10 M，检测限（LOD）计算为 8.66×10 M。配备苝二酰亚胺衍生物的半球形聚集体中 Fe 离子的正协同结合效应导致超分子聚合。Ba 离子通过完全猝灭荧光强度对 THF 中的荧光聚集体表现出选择性和灵敏度。线性 Stern-Volmer 图的 Stern-Volmer 常数值为 502.6 M，表明 Ba 离子的重原子效应导致荧光猝灭。使用电子显微镜详细研究了 Fe 和 Ba 存在下荧光 J-型半球形聚集体的形态转变。
