Frontiers in Chemistry (Jul 2022)

Fluorescence Enhancement of Dicyanomethylene-4H-Pyran Derivatives in Solid State for Visualization of Latent Fingerprints

  • Yi Cai,
  • Ting-Ting Hou,
  • Cai-Yun Wang,
  • Ying-Hao Tang,
  • Zhen-Yu Zhang,
  • Deteng Zhang,
  • Ming-Qiang Zhu,
  • Ya-Long Wang,
  • Ya-Long Wang,
  • Ya-Long Wang

DOI
https://doi.org/10.3389/fchem.2022.943925
Journal volume & issue
Vol. 10

Abstract

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The efficient development of latent fingerprint (LFP) is attractively important for criminal investigation. The low-cost and high-contrast developer is still a challenge. In this study, we designed and synthesized dicyanomethylene-4H-pyran (DCM) derivatives PZ-DCM and Boc-PZ-DCM by introducing of large steric hindrance group Boc, the solid-state fluorescence of DCM derivatives was greatly enhanced. The low-cost fluorescent LFP developers were prepared by blending with different proportion of montmorillonite (MMT). As a result, clear and high contrast fingerprint patterns were obtained with dusting method by the developer with 3% content of Boc-PZ-DCM. Furthermore, we employed the developer with 3% content of Boc-PZ-DCM to develop the sweat latent fingerprints on different substrates by powder dusting, and collected clear fingerprint patterns, indicating that the developer is universal. In a word, the Boc-PZ-DCM/MMT powder is a promising candidate for LFP developer.

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