Trifluoromethyl-substituted cyclometalated iridium^III emitters with high photostability for continuous oxygen sensing

Abstract

Trifluoromethyl-substituted cyclometalated Ir(III) complexes have been prepared and fully characterized.The photophysical and electrochemical properties of the complexes were investigated systematically. All iridium complexes exhibit high photoluminescence quantum yields, high oxidation potentials and good photostability against continuous irradiation. The optimum loading level of the Ir(III) complexes incorporated into oxygen-sensitive films has been discussed. Three different polymers were investigated for the development of efficient oxygen-sensitive films. All Ir(III) complexes immobilized in ethyl cellulose demonstrated quick responses to various oxygen concentrations and high sensitivity upon changes of oxygen partial pressure. These cyclometalated Ir(III) complexes with high photostability are potential candidates for online continuous monitoring of oxygen concentrations. ; Tel: +86-411-84986182 † Electronic supplementary information (ESI) available: Materials and methods, characterization of ligands, thermogravimetric analysis, and cyclic voltammograms. See

Bis-cyclometallated Ir(iii) complexes containing 2-(1H-pyrazol-3-yl)pyridine ligands; influence of substituents and cyclometallating ligands on response to changes in pH

“…2.5 to 12.5. 2-(1H-pyrazol-3-yl)pyridine ligands HL 1-3 were prepared by literature methods 24 as were 1-(4-(trifluoromethyl)phenyl)-1Hpyrazole 25 and 2-(4-(trifluoromethyl)phenyl)pyridine 26 and the bis-cyclometallated dimers 1a-d 18 and the data are consistent with those published. 18,19 General procedure for the synthesis of cationic complexes [Ir (C^N) 2 (HN^N)]PF 6…”

Oxygen-Promoted Suzuki-Miyaura Reaction for Efficient Construction of Biaryls

“…They supposed that oxygen could suppress the catalyst activation process and prevent catalyst deactivation due to the formation of Pd–Pd bonds through the adsorption of oxygen. To our delight, the oxygen‐promoted ligand‐free SM reactions in organic/water mixed solvents have been successfully applied to the synthesis of novel cyclometalated metal complexes …”

A diphenylamino-substituted cationic cyclometalated Ir(iii) complex: its aggregation-induced phosphorescent emission and oxygen sensing properties

“…Cyclometalated Ir(III) complexes have attracted much attention due to their high quantum yields, 1,2 large Stokes shifts, 3,4 and photo-and thermal stabilities 5,6 as well as the easy tunability of their properties. 7,8 So far, these complexes have been widely studied for their potential applications in organic electroluminescent devices, photocatalysis, cell imaging, analytical probing and so on.…”

“…A series of platinum(II) and iridium(III) complexes as efficient OSPs have been synthesized and investigated. 5,[37][38][39][40][41][42] In this paper, a new diphenylamino (DPA)-substituted cationic bis-cyclometalated Ir(III) complex with AIPE properties was synthesized, which was used to explore the effects of the DPA group on the photophysical and electrochemical properties of the corresponding Ir(III) complex. In addition, the oxygen sensitivity and operational stability of the Ir(III) complex were studied.…”