What question did this study set out to answer?

The study aims to improve latent fingerprint detection by employing advanced light-harvesting systems and molecular switching techniques.

May 28, 2026

High-Resolution Latent Fingerprinting by AIE-Active Light-Harvesting BODIHYs and pH-Induced Configurational Molecular Switching in Hydrazones

Key Points

The study aims to improve latent fingerprint detection by employing advanced light-harvesting systems and molecular switching techniques.
Utilized artificial light-harvesting systems combining BODIHYs and Rhodamine 6G for imaging.
Employed X-ray single-crystal analyses to assess interactions in AIE and ACQ systems.
Demonstrated pH-induced configurational switching in hydrazones for practical applications.
Achieved high-resolution fluorescence images of latent fingerprints at detail levels 1–3.
Demonstrated effective energy transfer efficiency with BODIHYs serving as donors and R6G as an acceptor.
Showed successful rapid and reversible E/Z configuration transitions in hydrazone L3 under varying pH.

Abstract

Latent fingerprint (LFP) detection is essential in criminal investigations, especially for identifying suspects. This study delves into the advancements in LFP imaging using artificial light-harvesting systems (ALHSs). These systems demonstrate high energy transfer efficiency and the antenna effect of BODIHYs (B1–B3) when combined with Rhodamine 6G (R6G), which led to the generation of high-resolution fluorescence images of LFPs, capturing details at levels 1–3 with great success. In these systems, BODIHYs (B1–B3) serve as a donor, while R6G serves as an acceptor. The BODIHYs were created from specific compounds: (E)-N′-(4-benzoylphenyl)picolinohydrazonoyl cyanide (L1), (Z)-N′-(4-benzoylphenyl)benzod-thiazole-2-carbohydrazonoyl cyanide (L2), and (Z)-ethyl 2-(benzodthiazol-2-yl)-2-(2-(4-benz-oylphenyl)hydrazono)acetate (L3). The ligands and BODIHYs exhibit strong emission properties in solution, aggregate, and solid states. The vital roles of various interactions in aggregation-induced emission (AIE; L2 and B1–B3) and aggregation-caused quenching (ACQ; L1) have been rationalized by X-ray single-crystal analyses. Notably, the hydrazone L3 contains a secondary hydrogen bond acceptor (−COOC2H5) and displays intramolecular hydrogen bonding, functioning as an effective molecular switch. Its ability to rapidly and reversibly transition between E and Z configurations under pH variations has been clearly demonstrated, which has practical application in inkless writing.

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Cite This Study

Yadav et al. (Tue,) studied this question.

synapsesocial.com/papers/6a17dcdf3fad632b0f9d98cd https://doi.org/https://doi.org/10.1021/acsaom.6c00117

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