Department of Chemistry, International Research Centre, Centre for Supramolecular Chemistry, Kalasalingam Academy of Research and Education (KARE), Anand Nagar, Srivilliputtur Tamil Nadu, 626126, Krishnankoil, India.
J Fluoresc. 2021 Sep;31(5):1303-1309. doi: 10.1007/s10895-021-02765-6. Epub 2021 Jun 10.
A pyrene based probe associated with π···hole - hydrazone as one of the recognizing elements is synthesized and its turn in to a selective colorimetric and turn-on fluorescent sensor, (L) for cyanide anion. This chemo sensor show high selectivity towards cyanide anion through photo electron transfer (PET) mechanism. The binding strength and sensitivity of the chemo sensor L towards cyanide are found to be 2.0 X 10, and 4.44 x 10 respectively. We have compared this high selectivity of the receptor towards cyanide, with our previously reported receptors L and L. The detailed UV-Vis, Emission, H-NMR, IR spectroscopic and Molecular Electrostatic Potential (MEP) studies reveals that the homogeneous π···hole dispersion in the aromatic ring governing the selectivity of the receptor towards cyanide anion. Such a positive π···hole homogeneous dispersion is missing in the case of sensor L, instead we have polarized π···hole dispersion towards 2 and 4 position of di-nitrophenyl chromophoric unit in L.
一种基于芘的探针与π···孔-腙作为识别元素之一结合，合成了一种选择性比色和荧光开启的传感器（L），用于检测氰根阴离子。这种化学传感器通过光电子转移（PET）机制对氰根阴离子表现出高选择性。实验发现，该化学传感器 L 与氰根阴离子的结合强度和灵敏度分别为 2.0×10 和 4.44×10。我们将受体 L 对氰根的高选择性与我们之前报道的受体 L 和 L 进行了比较。详细的紫外-可见、发射、H-NMR、IR 光谱和分子静电势（MEP）研究表明，芳香环中均匀的π···孔分散作用控制着受体对氰根阴离子的选择性。在传感器 L 的情况下，这种正的π···孔均匀分散作用缺失，相反，我们在 L 的二硝基苯生色团单元的 2 和 4 位置上产生了极化的π···孔分散作用。
