Citation: Qiaowen CHANG, Ke ZHANG, Guangying HUANG, Nuonan LI, Weiping LIU, Fuquan BAI, Caixian YAN, Yangyang FENG, Chuan ZUO. Syntheses, structures, and photo-physical properties of iridium phosphorescent complexes with phenylpyridine derivatives bearing different substituting groups[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(2): 235-244. doi: 10.11862/CJIC.20240311 shu

Syntheses, structures, and photo-physical properties of iridium phosphorescent complexes with phenylpyridine derivatives bearing different substituting groups

Qiaowen CHANG ^{1, 2} ,
Ke ZHANG ¹ ,
Guangying HUANG ¹ ,
Nuonan LI ³ ,
Weiping LIU ¹ ,
Fuquan BAI ³ ,
Caixian YAN ¹ ,
Yangyang FENG ^1,, ,
Chuan ZUO ^1,,

1.
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Institute of Precious Metals, Yunnan Precious Metals Lab, Kunming 650106, China
2.
Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
3.
Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China

Corresponding author: Yangyang FENG, fyy@ipm.com.cn Chuan ZUO, zuochuan@ipm.com.cn
Received Date: 22 August 2024
Revised Date: 7 November 2024

Figures(6)

To study the effect of substituents on the photo-physical properties of iridium phosphorescent complexes, four identical methyl (Me), methoxy (MeO), fluorine (F), or trifluoromethyl (CF₃) groups were introduced into the 2and 4-positions of the two phenyl groups onto the 2, 4-bis(2, 4-disubstituted phenyl) pyridine [2, 4-(2, 4-2R-phenyl)₂py, R=Me (HL1), MeO (HL2), F (HL3), CF₃ (HL4)] main ligands at the same time. Four iridium phosphorescent complexes (Ln)₂Ir(acac) [n=1 (Ir1), 2 (Ir2), 3 (Ir3), 4(Ir4)] were synthesized by using HL1, HL2, HL3, or HL4 as the main ligand and acetylacetone (Hacac) as the auxiliary ligand. The composition, spatial structure, and molecular stacking of all iridium phosphorescent complexes were characterized by elemental analysis, nuclear magnetic resonance spectroscopy (¹H NMR and ¹³C NMR), and single-crystal X-ray diffraction. The results indicated that all four iridium phosphorescent complexes exhibit slightly distorted octahedral configurations. The central iridium(Ⅲ) coordinates with the C and N atoms of the two main ligands to form a five-membered chelating ring while coordinating with the two oxygen atoms of the acetylacetone auxiliary ligand to form a stable six-membered chelating ring. The results are consistent with the chemical structure of the target compound. A comprehensive and systematic study was conducted on the photophysical properties of iridium phosphorescent complexes through solution and solid photoluminescence spectroscopy, UV Vis absorption spectroscopy, fluorescence lifetime, and theoretical calculations. The complexes Ir1, Ir2, Ir3, and Ir4 in solution with the photoluminescence quantum yields of 68%, 83%, 88%, and 81% exhibited maximum emission peaks at 537, 515, 514, and 553 nm, fluorescence lifetime of 26.75, 163.93, 64.50, and 330.39 ns, and in solid with maximum emission peaks at 536, 520, 520, and 546 nm, respectively. Four iridium phosphorescent complexes have different electron cloud distribution characteristics, and substituents can regulate the distribution of electron clouds on the benzene ring, further achieving the control of photophysical properties and chemical structure, such as emission wavelength in solution and solid-state, emission color, fluorescence lifetime, and molecular stacking.
- iridium(Ⅲ) complexes,
- phosphorescent materials,
- substituent group,
- phenylpyridine,
- photo-physical properties
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