Fluorene-decorated Ir(iii) complexes: synthesis, photophysics and tunable triplet excited state properties in aggregation

Abstract

Two new heteroleptic cationic Ir(III) complexes bearing benzothiazole and pyridine motifs on fluorene groups were synthesized and characterized. Complexes Ir1 and Ir2 exhibit 1π,π* transitions below 430 nm, with broad...

Unprecedented hetero-coordinated Ir(C^N)2tmd complexes containing both five- and six-membered Ir-(C^N) rings based on phenanthrylpyridine ligands: syntheses, crystal structures and photophysical properties

“…S42 †), which imply that their emissions originate from phosphorescence. 44,45 The emission spectra of seven complexes are broad and structureless, which fits well with the features of 3 CT processes ( 3 MLCT/ 3 ILCT/ 3 LLCT). 29,46 The moderate PL quantum yields of type-A complexes in degassed DCM solution were found to be 0.057 (Ir1-A), 0.08 (Ir2-A), 0.079 (Ir3-A) and 0.054 (Ir4-A), which are larger than those of type-B complexes (Ir1-B: 0.025, Ir3-B: 0.037, Ir4-B: 0.026).…”

Synthesis, Photophysics and Tunable Reverse Saturable Absorption of Bis-Tridentate Iridium(III) Complexes via Modification on Diimine Ligand

“…Taking Ir-1 for example (Figure 2b), it was discovered that the low energy emission bathochromically moved to longer wavelengths in solvents with higher polarity (e.g., CH 3 CN) relative to its location in the less polar solvents (e.g., THF). Considering their wide and structureless emission bands and solvatochromic effect (As show in Table 2), the emission properties of these complexes can be mainly ascribed to 3 MLCT/ 3 LLCT states with little 3 π-π* state [31][32][33].…”