A Highly Selective Fluorescent Sensor for Distinguishing Cadmium from Zinc Ions Based on a Quinoline Platform

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 Cd²⁺ in ethanol. Moreover, sensor <b>HL</b> can distinguish Cd²⁺ from Zn²⁺ via two different sensing mechanisms (photoinduced electron transfer for Cd²⁺; internal charge transfer for Zn²⁺). The composition of the complex Cd²⁺/<b>HL</b> or Zn²⁺/<b>L</b>^– has been found to be 1:1, based on the fluorescence/absorption titration and further confirmed by X-ray crystallography

A Highly Selective Fluorescent Sensor for Distinguishing Cadmium from Zinc Ions Based on a Quinoline Platform

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 Cd²⁺ in ethanol. Moreover, sensor <b>HL</b> can distinguish Cd²⁺ from Zn²⁺ via two different sensing mechanisms (photoinduced electron transfer for Cd²⁺; internal charge transfer for Zn²⁺). The composition of the complex Cd²⁺/<b>HL</b> or Zn²⁺/<b>L</b>^– has been found to be 1:1, based on the fluorescence/absorption titration and further confirmed by X-ray crystallography