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Lanthanide-based coordination polymers: a fluorometric Frontier in explosive sensing.

Samika Anand1, Abhishek Kumar2,3, Kalathiparambil Rajendra Pai Sunajadevi1

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Lanthanide-based coordination polymers (Ln-COPs) offer a sensitive method for detecting explosives. These novel materials provide a scalable and cost-effective solution for trace-level explosive detection in security applications.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Current explosive detection methods face challenges in sensitivity, selectivity, and cost.
  • Trace-level detection of explosives is crucial for public safety and counter-terrorism efforts.

Purpose of the Study:

  • To develop a simple and scalable synthesis of lanthanide-based coordination polymers (Ln-COPs).
  • To evaluate the potential of these Ln-COPs as sensitive fluorescent sensors for explosive detection.

Main Methods:

  • Synthesis of Ho(DAB) and Tb(DAB) via coordination of Ho(iii)/Tb(iii) ions with 3,3'-diaminobenzidine (DAB).
  • Characterization using spectroscopic and electron microscopic analyses.
  • Assessment of sensing capabilities for nitroaromatic and non-nitroaromatic explosives via fluorescence quenching.

Main Results:

  • Confirmed two-dimensional planar structures of the Ln-COPs.
  • Demonstrated high sensitivity in detecting explosives through fluorescence quenching.
  • Achieved a limit of detection of 7.7 µM for TNP using Tb(DAB).

Conclusions:

  • Ln-COPs exhibit excellent performance as explosive sensors.
  • The developed Ln-COPs are sensitive, selective, and practical for advanced explosive detection systems.
  • This research highlights the potential of Ln-COPs in enhancing security and safety measures.