科研之友
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摘要
Three colorimetric chemosensors were designed and synthesized by incorporating dimethyl yellow dye and multidentate chelating moieties into the preorganized dipodal receptors. The novel sensors display high selectivity for Cr3+ over a wide range of tested metal ions in a rapid visual output manner. UV-vis titrations with Cr3+ revealed the appearance of a new intense absorption band centered at about 515-530 nm which was accompanied by a dramatic change in color from light yellow to magenta, with the association constant being about 2.0 to 3.0 x 10(5) M-1. Further binding model studies by mass spectroscopy, Job's plot, and linear fitting of the UV-vis titration curve demonstrated that the receptors formed 4 : 4, 1 : 2, and 4 : 4 binding modes with Cr3+, respectively. The easy-to-prepare test papers indicated the potential application for detecting Cr3+ in natural aqueous environments without any spectroscopic instrumentation.
- 出版日期2016
- 单位辽宁石油化工大学
