Azole-Derived Fluorescent and Colorimetric Sensors for Zn 2+ Detection: Bioimaging and Emerging Applications

Azole-based heterocyclic compounds have gained significant attention for developing fluorimetric and colorimetric sensors due to their unique structures and electronic properties. Azoles such as imidazole, triazole, tetrazole, and pyrazole contain nitrogen donor atoms, which enable effective coordination with metal ions. Their tunable electronic structure, high stability, and ease of modification make them excellent building blocks for designing highly sensitive and selective probes. Notably, azole derivatives are widely used in designing fluorescent and colorimetric probes for detecting biologically important metal ions. The ability to detect Zn2+ with high precision is particularly important because Zn2+ plays essential roles in numerous biological processes, including enzyme regulation, cellular signaling, and gene expression. Consequently, azole-based probes find valuable applications in cellular studies, and environmental monitoring. This review covers recent advances in azole-derived sensors for Zn2+ detection, focusing on their design strategies, sensing mechanisms, and new applications in bioimaging and related research.