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A Ratiometric Fluorescent Sensor for Cd2+ Based on Internal Charge Transfer.

Dandan Cheng1, Xingliang Liu2, Yadian Xie3

  • 1Chemical Engineering College, Qinghai University, Xining 810016, China. 1994990022@qhu.edu.cn.

Sensors (Basel, Switzerland)
|November 4, 2017
PubMed
Summary

A new fluorescent sensor detects cadmium ions (Cd2+) with high sensitivity and selectivity. This sensor offers a low limit of detection, crucial for ensuring drinking water safety.

Keywords:
Cd2+ ionICTMe4BOPHYratiometric fluorescent sensor

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Cadmium (Cd2+) is a toxic heavy metal pollutant with significant environmental and health concerns.
  • Accurate and sensitive detection methods for Cd2+ are essential for environmental monitoring and public health protection.
  • Fluorescent sensors offer advantages such as high sensitivity, rapid response, and visual detection.

Purpose of the Study:

  • To develop and characterize a novel ratiometric fluorescent sensor for the selective detection of Cd2+ ions.
  • To investigate the sensing mechanism based on internal charge transfer (ICT) and π-π transitions.
  • To evaluate the sensor's performance, including limit of detection and selectivity, for practical applications.

Main Methods:

  • Synthesis of a novel fluorescent sensor molecule (Sensor 1) based on a tetramethyl substituted bis(difluoroboron)-1,2-bis[(1H-pyrrol-2-yl)methylene]hydrazine (Me₄BOPHY) core.
  • Modification of the Me₄BOPHY core with an electron-donating moiety for tunable electronic properties.
  • Spectroscopic characterization (absorption and emission) of the sensor in the visible region.
  • Investigation of the sensing mechanism through fluorescence spectroscopy upon binding with Cd2+ ions.

Main Results:

  • Sensor 1 exhibits absorption at 550 nm and emission at 675 nm, with long-wavelength spectral response facilitating detector fabrication.
  • Cd2+ ion binding modulates the internal charge transfer (ICT) and π-π transitions, enabling ratiometric fluorescence sensing.
  • Achieved a low limit of detection (LOD) of 0.77 ppb for Cd2+, significantly below the WHO safety limit of 3 ppb for drinking water.
  • Demonstrated high selectivity for Cd2+ over other common interfering metal ions.

Conclusions:

  • The developed Me₄BOPHY-based fluorescent sensor provides a sensitive and selective platform for Cd2+ detection.
  • The ratiometric sensing mechanism ensures reliable quantification and minimizes environmental interference.
  • This sensor holds promise for real-time monitoring of Cd2+ in environmental samples, particularly drinking water.