Two anthracene-based complexes [Ir(pbt)(aip)]Cl () and [Ir(pbt)(aipm)]Cl () have been synthesized based on the ligands aip = 2-(9-anthryl)-1-imidazo[4,5-][1,10]phenanthroline, aipm = 2-(9-anthryl)-1-methyl-imidazo[4,5-][1,10]phenanthroline, and pbtH = 2-phenylbenzothiazole in order to explore both the influence of the substituent group R (R = H in and CH in ) on photo-oxidation activity and photo-oxidation-induced luminescence. Both H NMR spectra and ES mass spectra indicate that the anthracene moiety in complex can be oxidized at room temperature upon irradiation with 365 nm light. Thus, this complex shows photo-oxidation-induced turn-on yellow luminescence. Compared to , complex incorporates an R = CH group, resulting in very weak photo-oxidation activity. On the basis of experimental results and quantum chemical calculation, we report the differences between and in both photo-oxidation behavior and the related luminescence modulation and discuss the relationship between photo-oxidation activity and substituent group R in these complexes.
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