Synthesis and Applications of Functionalized Dibenzothiophene S,S‐Dioxides in Optoelectronics and Bioimaging

Functionalized dibenzothiophene‐S,S‐dioxides (DBTO) have emerged as a versatile class of heteroaromatic scaffolds with remarkable optoelectronic and photophysical properties. Their rigid π ‐conjugated framework, combined with the strong electron‐withdrawing nature of the sulfone group, facilitates precise tuning of frontier molecular orbitals, enhancing charge transport and luminescence. This review presents a comprehensive exploration of synthetic strategies aimed at diversifying the structural and electronic landscape of functionalized DBT‐SO 2 derivatives. Key methodologies include regioselective bromination, directed lithiation, Suzuki–Miyaura and Stille cross‐coupling reactions, as well as oxidative and reductive modifications to introduce electron‐donating (or) electron‐withdrawing substituents. By fine‐tuning the substitution pattern and conjugation length, a diverse set of DBTO based molecules was synthesized with tailored optical bandgaps and charge transport properties. The resulting compounds exhibit tunable absorption and emission properties, high photostability, and strong fluorescence quantum yields, making them promising candidates for multifunctional applications. Detailed spectroscopic, electrochemical, and thermal characterizations reveal structure–property relationships critical for optimizing performance in organic light‐emitting diodes (OLEDs), organic field‐effect transistors (OFETs), and fluorescence‐based bioimaging platforms. Furthermore, select derivatives demonstrate excellent photostability and biocompatibility, enabling their use as fluorescent probes for cellular imaging. Their strong absorption in the UV–visible region, combined with deep‐blue to green emission and low cytotoxicity, underscores their promise in biomedical applications. Overall, this work provides a systematic framework for the molecular design and functional optimization of DBT‐SO 2 ‐based materials. The results emphasize how structural engineering can be leveraged to unlock multifunctional performance, bridging the fields of organic electronics and bioimaging. These findings open new avenues for the development of high performance, tunable organic materials based on the DBTO scaffold.