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Luminescent materials have garnered significant research interest due to their potential applications in optoelectronics, sensing, and medical diagnostics. Within this context, tetra-coordinated organoboron complexes have emerged as promising luminescent materials due to their enhanced stabilities, high electron affinities, and tuneable fluorescence properties. Herein, we report the synthesis, structure, and photophysical properties of two different types of N,O-chelated tetra-aryl pyrazole-based organoboron compounds. We also investigated the aggregation-induced enhanced emission properties of the synthesized complexes and further demonstrated their utility for picric acid sensing. The absorption and emission behaviours of these compounds reveal that the position of boron chelation plays a crucial role in determining their photophysical properties as well as their sensing behaviour. [ABSTRACT FROM AUTHOR]

A series of differently substituted 2-(2-hydroxyphenyl) benzimidazoles were synthesized by a coupling reaction involving aryl dibromides and 2-hydroxyphenyl benzimidazole. These ligands react with BF3·Et2O to yield the corresponding boron complexes. The photophysical properties of the ligands (L1–L6) and the boron complexes (1–6) were studied in the solution state. Among these, the ligands L1–L4 and L6 displayed aggregation-induced emission (AIE) behavior upon the addition of water in THF resulting in a sizable enhancement of fluorescence intensity. Additionally, compound 5 was found to detect picric acid with a detection limit of 8.33 × 10−7 M. [ABSTRACT FROM AUTHOR]

Development of new n‐type semiconductors with tunable band gap and dielectric constant has significant implication in dissociating bound charge carrier relevant for demonstrating high performance optoelectronic devices. Boron‐β‐thioketonates (MTDKB), analogues to boron‐β‐diketonates containing a sulfur atom in the framework of β‐diketones were synthesized. Bulk transport measurement exhibited an outstanding bulk electron mobility of ≈0.003 cm2 V−1 s−1, which is among the best values reported till date in these class of semiconducting materials and correspondingly a single junction photo responsivity of upto 6 mA W−1 was obtained. This new family of O,S‐chelated boron compounds exhibited luminescence in the far red/near‐infrared region. The remarkable red shift of 89 nm (fluorescence) observed for 4 a in comparison with analogues boron‐β‐diketonate signifies the importance of sulfur in these molecules. MTDKBs with amine functionality have also been investigated as an ON/OFF fluorescent sensor. [ABSTRACT FROM AUTHOR]