Phosphorescent Dimesitylboryl-Appended Iridium(III) Complex for Fluoride Anion Sensing

摘要

Owing to the importance of fluoride anion (F~-) in the treatment of osteoporosis and dental care, the recognition and sensing of fluoride anion is attracting attention. Many fluoride chemosensors containing (thio) ureas, amides, pyrrole, and imidazolium ring have been prepared to date. Those chemosensors usually form strong hydrogen bonds between their N-H hydrogens and fluoride anion. Recently, tri-coordinate organoboron compounds such as dimesitylboryl [B(Mes)2] compounds have been found to achieve highly efficient fluoride anion detection using specific Lewis acid-base interaction. Fluoride chemosensors based on tri-coordinate boron moiety such as B(Mes)2 bind with fluoride anion to afford strong B-F interaction, which can change the lowest excited state or block the intramolecular charge transfer. Thereby, the photophysical properties can be changed.