FRET-based probe for fluoride based on a phosphorescent iridium(iii) complex containing triarylboron groups

Synthesis of cationic iridium(III) complexes with high quantum yield via enhancing the steric hindrance of ligands

“…On the basis of a procedure similar to prepare [Ir(dclppz) 2 Cl] 2 , other chloride-bridged dimers, [Ir(dfppz) 2 Cl] 2 , [Ir(mebd) 2 Cl] 2 and [Ir(crbd) 2 Cl] 2 were synthesized.…”

“…The organometallated dimer [Ir(dclppz) 2 Cl] 2 was synthesized from reaction of IrCl 3 $3H 2 O (0.81 g, 2.32 mmol) with 1-(2,4-dichlorophenyl)-1H-pyrazole (dclppz, 1.0 g, 5.13 mmol) in 2-ethoxyethanol and water mixture (V:V ¼ 3:1, 40 mL) for 24 h. After cooling to the room temperature, the product was filtered out and washed with diethyl ether followed by ethanol, and dried (yield: 79%). On the basis of a procedure similar to prepare [Ir(dclppz) 2 Cl] 2 , other chloride-bridged dimers, [Ir(dfppz) 2 Cl] 2 , [Ir(mebd) 2 Cl] 2 and [Ir(crbd) 2 Cl] 2 were synthesized.…”

Fluoride Anion Sensing Mechanism of 2-Ureido-4[1H]-pyrimidinone Quadruple Hydrogen-Bonded Supramolecular Assembly: Photoinduced Electron Transfer and Partial Configuration Change

“…Up to now, different sensing mechanisms, such as photoinduced electron transfer (PET), 4 intramolecular charge transfer (ICT), 5 excited state proton transfer (ESPT), 3c,6 fluorescence resonance energy transfer (FRET), 7 excimer/ exciplex formation, 8 F − triggered X−O (X = Si, C, and B) bond cleavage, 3c,9 etc., have been proposed and employed in design of the fluorescent chemosensors for fluoride anion, the smallest and the most electronegative anion interacting with chemical sensors effectively via hydrogen bond (HB) interaction. 6a It is known that, through the regulation of electronic states by HB interactions, nonirradiative deactivations of fluorescent chemosensors can be dramatically influenced, 10 that is, the fluorescence of the fluorescent chemosensors in HB surroundings is either quenched or enhanced by HBs, especially the excited-state HB.…”

Manipulating efficiencies through modification of N-heterocyclic phenyltriazole ligands for blue iridium(III) complexes

“…2(c). According to the reported literatures [48,50,51], the phosphorescence spectra of iridium(III) complexes suffer a rigidochromic effect on going from 298 to 77 K. The emissions from the CT states (including 3 MLCT and 3 LLCT) are broad and sensitive to temperature, while those from 3 LC state often display little dependence on temperature [52,53]. It means that the CT states-dominated phosphorescence spectra always suffer obvious rigidochromic shift, while the 3 LC state-dominated phosphorescence display little rigidochromic shift.…”