Tuning the Photophysical Properties of Cyclometalated Ir(III) Complexes by a Trifluoroacetyl Group

Design and synthesis of lipid-mimetic cationic iridium complexes and their liposomal formulation for in vitro and in vivo application in luminescent bioimaging

“…S6. † Similar to the interpretation given in earlier publications 32,34,[37][38][39][40][41][42] for this type of iridium complexes the intense absorption bands in the 250-320 nm range could be assigned to spin allowed 1 p-p* ligand centered (LC) transitions located at the cyclometalated and diimine ligands. The longer wavelength absorption bands and shoulders with lower extinction coefficients evidently originate from the mixture of metal-to-ligand ( 1 MLCT) and ligand-to-ligand ( 1 LLCT) charge transfer.…”

Syntheses and properties of cyclometalated ruthenium(II) complexes with 1,10-phenanthroline and phenylphthalazine ligands

“…These cycloruthenated polypyridyl complexes have been used as active components in a variety of applications including supramolecular assembly, (photoinduced) electron-transfer reactions and photochemistry [7][8][9]. One the other hand, versatile phenylphthalazine-type ligands have only been employed in the synthesis of cyclometalated Ir(III) complexes, which exhibited unique phosphorescence properties [10][11][12]; with polymeric light-emitting devices doped with complex, tris(1-(2,6-dimethylphenoxy)-4-(4-chlorophenyl) phthalazine)-iridium(III), nearly 100% internal phosphorescence efficiency has been achieved [13]. Recently, we have reported the syntheses and phosphorescent properties of several heteroleptic ruthenium(II) polypyridine complexes with a series of substituted 2,2′-bipyridine ligands [14].…”

Novel Cyclometalated Iridium(III) Xanthate Complexes and Their Phosphorescence Behavior in the Presence of Metal Ions

“…In the 1 H NMR spectrum of Ir(dpppz)(ppz)(ipx), the six protons of the methyl groups on phenoxy appeared at 2.24 ppm, and the three phenoxy protons appeared at 6.47 and 6.72 ppm, while these peaks disappeared totally in Ir(ppz) 2 (ipx), which indicated a partly hydrolysis of the phenoxy group in Ir(dpppz)(ppz)(ipx) and an entirely hydrolyzation in Ir(ppz) 2 (ipx). Because Ir(dpppz)(ppz)(ipx) was the minor and Ir(ppz) 2 (ipx) was the main product, it could be deduced that most of the cyclometalated ligands hydrolyzed during the reflux reaction of the ligands and IrCl 3 ·3H 2 O [11]. Actually, if the 2,6-dimethylphenoxy group was replaced by a phenoxy group, no cyclometalated iridium(III) complex could be obtained, and the cyclometalated ligands underwent complete hydrolysis.…”

“…The neutral cyclometalated iridium(III) complexes Ir(dpppz)(ppz)(ipx) and Ir(ppz) 2 (ipx) were readily prepared from the Ir(III)-µ-chloro-bridged dimers [11] and potassium isopropyl xanthate at room temperature (Fig. 1).…”

“…The mixture was stirred overnight under nitrogen at 110 • C and cooled to room temperature. The precipitate was collected and washed with ethanol and acetone, and then dried in vacuo to give red cyclometallated Ir(III)-µ-chloro-bridged dimers (0.27 g) [11]. The Ir(III)-µ-chloro dimers (0.27 g) and potassium isopropyl xanthate (0.17 g, 1.00 mmol) were dissolved in the mixed solvent of CH 2 Cl 2 -CH 3 OH (15 : 15 mL).…”