|
|
★ ★ ★ ★
小木虫(金币+0.5):给个红包，谢谢回帖交流
sirljz(金币+3,VIP+0):谢谢交流，欢迎常来。 11-9 14:00
|
Abstract: This paper reports the synthesized and characterized 1 - phenyl-pyrazole as the first ligand, 2 - (2'-hydroxyphenyl) benzothiazole and its derivatives for the auxiliary ligand, which are a new kernel with the Iridium objects (ppz) 2Ir (LX) (ppz = 1 - phenyl-pyrazole, LX = 2 - (2'-hydroxyphenyl) benzothiazole BTZ, 2 - (3'-methyl -2 '- hydroxyphenyl ) benzothiazole 3-MeBTZ, 2 - (4'-methyl -2 '- hydroxyphenyl) benzothiazole 4-MeBTZ, 2 - (4'-trifluoromethyl -2' - hydroxyphenyl) benzene thiazole 4-tfmBTZ). The cooresponding molecular structure, photophysical and electrochemical properties were tested and analyzed comparatively. The results show that four kinds of complexes have essentially the same UV absorption spectra. The excitation spectra of four kinds of complexes have similar fluorescence emission spectra of the maximum emission peak located in 583-615nm, about 400nm are in the presence of a weak optical emission. The emission comes mainly from the light absorption of ligand, rather than 3MLCT and 3π-π * transitions. On the other hand, Ir (ppz) 3, compared not only realized at room temperature phosphorescence, but also through the second modification of ligand to achieve the modulation of luminous color. This indicates that there exists a ring of metal-based ligands to the ligand-assisted energy transfer. The observed 400nm emission is attributed to a weak perturbation of the auxiliary metal ion ligands BTZ of the singlet exciton radiative transition, while the long wavelength of light emission is attributed to Ir (BTZ) of the 3MLCT triple exciton transition radiation. |
|
回复此楼