Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram 624302, India.
Department of Chemistry, Gandhigram Rural Institute (Deemed to be University), Gandhigram 624302, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Nov 5;241:118610. doi: 10.1016/j.saa.2020.118610. Epub 2020 Jun 18.
A bis (thiosemicarbazone) based probe has been synthesized and structurally characterized. The probe exhibits good selectivity towards Zn(II), Cd(II) and Hg(II) ions in an aqueous solution containing 95% water with ratiometric fluorescence changes. The modes of coordination of the probe with these metal ions and binding properties have been examined using different spectral techniques. The binding constants, determined using fluorescence titration data, are found to be 9.8 × 10, 1.39 × 10 and 2.03 × 10 M, respectively for Zn(II), Cd(II) and Hg(II) complexes. The high sensitivity of the probe has been demonstrated by the very low limit of detection i.e. 5.1, 3.4 and 0.51 μM for Zn(II), Cd(II) and Hg(II) ions, respectively. Different coordination mode of these metal ions with the probe has resulted in varying intra-ligand fluorescence (λ nm, Zn(II): 488, Cd(II): 470 and Hg(II): 578) among these metal complexes.
一种双（硫代氨基甲肟）基探针已被合成并进行了结构表征。该探针在含有 95%水的水溶液中对 Zn(II)、Cd(II)和 Hg(II)离子表现出良好的选择性，具有比比率荧光变化。使用不同的光谱技术研究了探针与这些金属离子的配位模式和结合特性。使用荧光滴定数据确定的结合常数分别为 9.8×10、1.39×10 和 2.03×10 M，分别为 Zn(II)、Cd(II)和 Hg(II)配合物。探针的高灵敏度通过非常低的检测限证明，即 Zn(II)、Cd(II)和 Hg(II)离子的检测限分别为 5.1、3.4 和 0.51 μM。这些金属离子与探针的不同配位模式导致这些金属配合物之间的内配体荧光（λnm，Zn(II)：488、Cd(II)：470 和 Hg(II)：578）有所不同。
