Citation: Xin TONG, Shi-Sheng ZHAO, Xi CHU, Wen-Hao LI, Hong-Yan LI. Two Iridium Complexes Containing Aldehyde Group for Cysteine and OH^- Recognition[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(10): 1939-1947. doi: 10.11862/CJIC.2022.201 shu

Two Iridium Complexes Containing Aldehyde Group for Cysteine and OH^- Recognition

School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin 300130, China

Corresponding author: Hong-Yan LI, hyli@hebut.edu.cn
Received Date: 25 January 2022
Revised Date: 10 July 2022

Figures(8)

Two iridium(Ⅲ) complexes, [Ir(L1)₂(dbr-bpy)]PF₆ (Ir1) and [Ir(L2)₂(dbr-bpy)]PF₆ (Ir2) with 4, 4'-dibromo-2, 2'-bipyridine (dbr-bpy) as neutral ligand, 6-phenylnicotinaldehyde (L1) and 6-(4-trifluoromethylphenyl)pyridine-3-carbaldehyde (L2) as cyclometalated ligands, were synthesized and characterized by ¹H NMR, ¹³C NMR, IR and MS spectra. For the emission spectra in acetonitrile solution, the maximum peaks were located at 584 and 530 nm for complexes Ir1 and Ir2 with quantum efficiencies of 49% and 66%, respectively. The introduction of electronwithdrawing trifluoromethyl and aldehyde groups resulted in an obvious blue shift in the emission spectra of complexes Ir1 and Ir2. The study of cyclic voltammograms indicates trifluoromethyl moieties in the cyclometalated ligands of complexes Ir1 and Ir2 can reduce the energy of the highest occupied molecular orbital (HOMO), and make the oxidation potential shift towards the anode. Density functional theory (DFT) calculations have been carried out to gain insight into their frontier molecular orbital properties and transition details. Complexes Ir1 and Ir2 displayed significant phosphorescence quenching upon binding to cysteine (Cys), and the binding stoichiometry was approximately 1:2 with the detection limit of 35.1 and 18.5 μmol·L^-1, respectively. Both complexes showed a good anti-interference ability for the detection of Cys. Upon the addition of OH^- into the solution of Ir2 in DMSO/H₂O (7∶3, V/V), OH^- replaced the bromine substituents on the neutral ligand of Ir2, resulting in a blue shift of the emission peak. The luminescence color of complex Ir2 changed from yellow to green and Ir2 showed a 4-fold enhanced emission in an alkaline environment when compared to neutral pH. In addition, complex Ir2 exhibited high sensitivity and selectivity for OH^- and showed good anti-interference ability.
- iridium complex,
- cysteine,
- aldehyde group,
- OH^- sensing
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Two Iridium Complexes Containing Aldehyde Group for Cysteine and OH- Recognition

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通讯作者: 陈斌, bchen63@163.com

Two Iridium Complexes Containing Aldehyde Group for Cysteine and OH^- Recognition