This article reports an amide based Chemosensor used for selective detection of divalent Cu+2 and Ni+2 ions via Fluorescence turn off. The selective sensing ability of Chemosensor was investigated in presence of different metal ions Mg2+, Ag+, Fe2+, K+, Cu2+, Ni2+, Hg2+, Pb2+, Mn2+, Pd2+, Cd2+ and Mn3+ as competitive ions. The receptor i. e. Chemosensor formed complexes with metal ions in 1:1 stoichiometric ratio. The detection limit and binding constant calculated as 1.92×10–4 and 1.4×10–4 M and 2.16×103 M−1 and 3.09×103 M−1 for Cu2+ and Ni2+ions respectively. The complexes were characterized by UV/visible, FT-IR, 13C NMR and 1H NMR spectroscopy. Further the structure and Crystallinity were calculated by P-XRD spectral analysis. The crystallinity found to be 65.27 and 67.87% respectively

中文翻译：

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用于检测 Cu2+ 和 Ni2+ 离子的 N2, N6-双（5-甲基噻唑-2-基）吡啶-2,6-二甲酰胺荧光传感器的合成

本文报道了一种基于酰胺的化学传感器，用于通过关闭荧光来选择性检测二价 Cu+2 和 Ni+2 离子。在存在不同金属离子 Mg2+、Ag+、Fe2+、K+、Cu2+、Ni2+、Hg2+、Pb2+、Mn2+、Pd2+、Cd2+ 和 Mn3+ 作为竞争离子的情况下，研究了化学传感器的选择性传感能力。受体 i。e. 化学传感器与金属离子以 1:1 的化学计量比形成络合物。Cu2+ 和 Ni2+ 离子的检测限和结合常数分别计算为 1.92×10-4 和 1.4×10-4 M 和 2.16×103 M-1 和 3.09×103 M-1。通过紫外/可见光、FT-IR、13C NMR 和 1H NMR 光谱表征复合物。此外，通过P-XRD光谱分析计算结构和结晶度。结晶度分别为 65.27% 和 67.87%