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

摘要: Owing to the importance of fluoride anion (F−) in treatment osteoporosis and dental care, recognition sensing is attracting attention. Many chemosensors containing (thio) ureas, amides, pyrrole, imidazolium ring have been prepared date. Those usually form strong hydrogen bonds between their N-H hydrogens anion. Recently, tri-coordinate organoboron compounds such as dimesitylboryl [B(Mes)2] found achieve highly efficient detection using specific Lewis acid-base interaction. Fluoride based on boron moiety B(Mes)2 bind with afford B-F interaction, which can change lowest excited state or block intramolecular charge transfer. Thereby, photophysical properties be changed. However, output signals selective absorption and/or fluorescence. Nowadays, phosphorescent also developed for anions since first sensor reported by Gabbai et al. Phosphorescent are quite attractive because relatively long life time phosphorescence eliminate interference shorter-lived background fluorescence scatterring light present biological samples. Among various types phosphors, cyclometalated iridium(III) complexes that used, example, an dopant organic emitting diodes (OLEDs) a chemosensor mercuric ion excellent electrochemical properties. only few complex reported. In this paper, we report synthesis novel complex, Ir(p-B-ppy)2picolinate (1), where p-B-ppy 2-(4-(dimesitylboryl)phenyl)pyridine, its application A multi-step synthetic pathway leading (1) shown Scheme 1. The main ligand (2), was Suzuki coupling 4-bromophenylboronic acid 2-bromopyridine then substitution bromo group via procedure reported, treated chloride trihydrate mixed solvent 2-ethoxyethanol water iridium chloride-bridged dimer 3, [(p-B-ppy)2IrCl]2. 3 picolinic presence sodium carbonate (1). UV-vis photoluminescence spectra Ir(p-B-