کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
744022 | 1462123 | 2011 | 8 صفحه PDF | دانلود رایگان |
A simple structure, a rhodamine fluorescent derivative, was synthesized easily by a one-step condensation reaction of rhodamine B ethylenediamine and acetylacetone. Its structure was characterized by X-ray crystallography, NMR, MS and IR spectroscopy. As a bi-functional and highly selective “OFF–ON” chemosensor for Fe3+ or Cu2+, the derivative displayed a selective fluorescence enhancement effect only with Fe3+ and an absorption enhancement effect only with Cu2+ by modulating the pH value. In an aqueous ethanol medium, Fe3+ formed a 1:1 complex with the derivative at pH 6, while Cu2+ formed a 1:1 complex at pH 8.5. The limits of detection of the ions were low: 3.9 × 10−9 and 4.8 × 10−8 mol L−1. The derivative also functioned as a fluorescence sensor for CT-DNA, in which the Fe3+ ion that was used as a bridge between the derivative and DNA forming a ternary complex.
Journal: Sensors and Actuators B: Chemical - Volume 160, Issue 1, 15 December 2011, Pages 662–669