Two new ionic iridium(Ⅲ) complexes,[Ir(mpiq)2(dtbbpy)]PF6 (R1) and[Ir(mpiq)2(dibbpy)]PF6 (R2),were synthesized by choosing 1-(3,5-dimethylphenyl) isoquinoline (mpiq) as the cyclometalated ligand and 4,4'-di-tert-butyl-2,2'-bipyridine (dtbpy) and 4,4'-dibromo-2,2'-bipyridine (dibbpy) as the auxiliary ligand of R1 and R2,respectively. The compositions and chemical structures of the complexes were characterized by elemental analysis,mass spectrometry,nuclear magnetic resonance spectroscopy and infrared spectroscopy along with single-crystal X-ray diffraction,and the photophysical properties were measured by using UV-visible and photoluminescence spectroscopy. The thermal stability was tested by thermogravimetric analysis. The results show that the complexes R1 and R2 have good thermal stability. Their maximum emission wavelengths are 598 nm and 613 nm,and the cooresponding emitting color is yellow and red-greenish,respectively. The substituent group in the auxiliary ligand has some effect on the mission wavelengths of the complexes. When the electron-donating group-C(CH3)3 is introduced,the electron cloud of the complex molecules will be aggregated,leading to a decrease in the mission wavelength. On the contrary,the electron-drawing group Br introduced in the auxiliary ligand disperses the electron cloud of the molecules,as a result,the mission wavelength will be red-shifted.
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