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Two Anthracene-Based Ir(III) Complexes [Ir(pbt)2(aip)]Cl and [Ir(pbt)2(aipm)]Cl: Relationship between Substituent Group and Photo-oxidation Activity as Well as Photo-oxidation-Induced Luminescence

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journal contribution
posted on 10.11.2020, 20:59 by Qin-Zhen Yuan, Qianwenhao Fan, Hang Lv, Wen-Wen Chen, Xue-Xiao Yang, Deng-Ke Cao, Jing Wen
Two anthracene-based complexes [Ir­(pbt)2(aip)]Cl (1) and [Ir­(pbt)2(aipm)]­Cl (2) have been synthesized based on the ligands aip = 2-(9-anthryl)-1H-imidazo­[4,5-f]­[1,10]­phenanthroline, aipm = 2-(9-anthryl)-1-methyl-imidazo­[4,5-f]­[1,10]­phenanthroline, and pbtH = 2-phenylbenzothiazole in order to explore both the influence of the substituent group R1 (R1 = H in 1 and CH3 in 2) on photo-oxidation activity and photo-oxidation-induced luminescence. Both 1H NMR spectra and ES mass spectra indicate that the anthracene moiety in complex 1 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 1, complex 2 incorporates an R1 = CH3 group, resulting in very weak photo-oxidation activity. On the basis of experimental results and quantum chemical calculation, we report the differences between 1 and 2 in both photo-oxidation behavior and the related luminescence modulation and discuss the relationship between photo-oxidation activity and substituent group R1 in these complexes.