Used as a key monomer in the synthesis of polydiacetylenes, which are conjugated polymers known for their unique optical and electronic properties. These polymers are widely applied in sensor technologies, particularly in colorimetric biosensors that detect temperature, pH, or biomolecular interactions due to their visible color change upon external stimuli. Also employed in developing smart packaging and diagnostic tools, where real-time monitoring of environmental changes is required. Its rigid molecular structure enhances the stability and sensitivity of the resulting polymer matrices.