Synthesis, characterization of the amido-conjugates of 1,1′-methylene-bis(2-naphthol) and recognition of Cu2+ in aqueous acetonitrile
作者:Garima Singh Baghel、Jugun Prakash Chinta、Chebrolu P. Rao
DOI:10.1039/c2nj40409e
日期:——
Di-amido-derivatives of 1,1â²-methylene-bis(2-naphthol) (mbn), viz.; L1 to L6 and L7, have been synthesized and characterized. The single crystal X-ray structure of L2 has been established. All these derivatives have been studied for metal ion recognition by fluorescence and absorption techniques. Among these, L6 and L7 were found to be selective towards Cu2+ even in the presence of other metal ions in aqueous acetonitrile owing to the presence of the N,O-binding core up to the lowest concentration of 210 ± 11 and 144 ± 3 ppb, respectively. The binding region has been identified by 1H NMR studies. The proposed mode of binding has been modelled by DFT computations.
合成并鉴定了 1,1â²-亚甲基双(2-萘酚)(mbn)的二氨基衍生物,即 L1 至 L6 和 L7。L2 的单晶 X 射线结构已经确定。通过荧光和吸收技术研究了所有这些衍生物对金属离子的识别能力。在这些衍生物中,L6 和 L7 被发现对 Cu2+ 具有选择性,即使在乙腈水溶液中存在其他金属离子的情况下也是如此,这是因为在最低浓度分别为 210 ± 11 ppb 和 144 ± 3 ppb 时存在 N,O 结合核。通过 1H NMR 研究确定了结合区域。拟议的结合模式已通过 DFT 计算建立了模型。