Used as a key intermediate in the synthesis of fluorescent dyes and probes due to its ability to form conjugated systems that enhance photostability and emission intensity. Commonly employed in the development of sensors for detecting metal ions and biological molecules. Its rigid julolidine structure improves quantum yield in laser dyes and is utilized in optoelectronic applications, including organic light-emitting diodes (OLEDs). Also serves as a building block in medicinal chemistry for designing bioactive molecules with imaging capabilities.