Based on a cyclic chalcone framework, the dye named CCF was constructed using 1,3-indanedione and 4-(9H-carbazol-9-yl)benzaldehyde. Quantum chemical calculations revealed its optimized molecular configuration and pronounced intramolecular charge transfer (ICT) characteristics. CCF exhibits significant polarity sensitivity, attributed to its substantial dipole moment (2.89 D). Leveraging this property, a fluorescent fingerprint powder, CCF-MMT, was prepared by combining CCF with montmorillonite. This composite exhibits a responsive color-change behavior when interacting with latent fingerprints: upon contact with sebaceous present in fingerprint residues, its fluorescence shifts from dark red to moderate red. This visual enhancement enables high-quality fingerprint development even on rough or curved surfaces where excess powder may adhere. Furthermore, the red fluorescence emission effectively suppresses interference from the blue fluorescence background commonly caused by commercial additives. With its high resolution, visual enhancement, exceptional contrast, broad adaptability, real-time development capability, and cost-effectiveness, CCF-MMT provides a high-quality solution for latent fingerprint visualization, positioning it as an ideal choice for complex crime scene investigations.
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