雙磷光發(fā)射銥配合物的設(shè)計(jì)、制備、光物理性質(zhì)研究及其在氧氣檢測(cè)中的應(yīng)用
[Abstract]:Phosphoiridium complex is widely used as a new luminescent probe to detect anion, amino acid, nucleic acid, biomolecules and microenvironment parameters such as pH, temperature, oxygen concentration and so on. The iridium complex can be detected by the response of emission intensity or lifetime when the analytical concentration or environmental parameters change. Most of the transition metal complexes with d 6 electron configurations have luminescent excited states derived from metal to ligand charge transfer states (MLCT) (, for example, Ru (II), Os (II), etc.), and iridium (III) complexes exhibit more diverse emission states, except for MLCT, Also common are the charge transfer states (IL,LLCT) in ligand and between ligands. These excited states are very easy to be affected by the structure of ligands and the environment, and under some conditions, the two excited states can exist simultaneously, which makes the iridium complexes have double phosphorescence emission properties. In this paper, a class of iridium complexes with double phosphorescence emission at room temperature are studied, and their applications in oxygen detection are developed: 1. Design, synthesis and photophysical properties of double phosphorescent iridium complexes We have found that a class of iridium complexes containing amino modified N ^ C ligands have double phosphorescence emission properties. A series of iridium complexes with a general structure of [Ir (ppy-CH_2NR~1R~2) _ 2 (bpy-CONH)] (PF6) were synthesized. Their photophysical properties were studied in detail by introducing primary, secondary and tertiary amine groups into their N ^ C ligands. In particular, the double phosphorescence emission properties. At the same time, the complexes without amino groups were synthesized and compared with each other. The structures of these complexes were characterized by 1H NMR, mass spectrometry. It is found that when the secondary amines and tertiary amines are introduced into the N ^ C ligands, the complexes exhibit obvious double phosphorescence emission properties. The luminescence mechanism was studied by TD-DFT. We believe that the existence of charge transfer state (NLCT) from amino to ligand interferes with the internal conversion process between complex IL (charge transfer state between ligands) and MLCT (charge transfer state from metal to ligand). The double phosphorescence emission properties of the complexes have been realized. In addition, the sensitivity of the two states to oxygen quenching is different due to the different lifetime of the excited states. Therefore, the double phosphorescence iridium complex can be used as a small molecular phosphorescence probe with a phosphorescence ratio of 2. 2. The Design, preparation and Application of the ratio oxygen probe of Diphosphorescent Iridium complexes We have designed and synthesized phosphoiridium complexes containing no amino, secondary amines and tertiary amines. General formula [Ir (ppy-CH_2-R) _ 2 (bpy- (CONH-C_4H_9) _ 2)] (PF_6) (RH5, NHC_4H_9 (6), NC_5H_ (10) (7).) The structures of these complexes were characterized by 1H NMR, mass spectrometry and their photophysical properties were studied in detail. The experimental results show that the complex 7 exhibits a double peak emission at room temperature, with emission peaks at 525 nm and 630 nm., respectively. The response of complex 7 to oxygen is studied in detail. It is found that the emission intensity and decay life of complex 7 vary obviously in different oxygen concentration environments. Furthermore, we prove that the response of complex 7 has a good linear relationship and a wider range of responses. The ratio of hypoxia and hyperoxia can be detected. At the same time, complex 7 has good biocompatibility, cell uptake efficiency and low cytotoxicity, so it has a good application prospect in cell detection. Two-channel confocal imaging was used to investigate the oxygen content of complex 7 in living cells. The luminescence intensity of living cells changed significantly with different oxygen content, and not only could the imaging of hypoxia in cells be realized. Moreover, it can be used to detect hyperoxia in cells.
【學(xué)位授予單位】:南京郵電大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:O641.4;O657.3
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