A Highly Selective Fluorescent
Sensor for Distinguishing
Cadmium from Zinc Ions Based on a Quinoline Platform
- Publication date
- Publisher
Abstract
A fluorescent sensor, <i>N</i>-(quinolin-8-yl)-2-(quinolin-8-yloxy)acetamide
(<b>HL</b>), based on 8-aminoquinoline and 8-hydroxyquinoline
platforms has been synthesized. This sensor displays high selectivity
and sensitive fluorescence enhancement to Cd<sup>2+</sup> in ethanol.
Moreover, sensor <b>HL</b> can distinguish Cd<sup>2+</sup> from
Zn<sup>2+</sup> via two different sensing mechanisms (photoinduced
electron transfer for Cd<sup>2+</sup>; internal charge transfer
for Zn<sup>2+</sup>). The composition of the complex Cd<sup>2+</sup>/<b>HL</b> or Zn<sup>2+</sup>/<b>L</b><sup>–</sup> has been found to be 1:1, based on the fluorescence/absorption
titration and further confirmed by X-ray crystallography