两种基于苯并咪唑衍生物配体的新型铱(Ⅲ)配合物的合成及发光性能研究

Synthesis and Luminescent Properties of Two New Ir(Ⅲ) Complexes Based on Benzoimidazole Derivatives

合成了新型配体N-异丙基-2-苯基苯并咪唑(bi)和N-异丙基-2-(4-氟苯基)苯并咪唑(fbi),并用它们与三氯化铱和乙酰丙酮反应,制备了相应的环金属铱(Ⅲ)配合物发光材料(bi)2Ir(acac)和(fbi)2Ir(acac)(acac=乙酰丙酮).对其结构用1HNMR和元素分析方法进行了表征,研究了配合物的UV-vis,荧光光谱及电化学性质.两种材料的最大发光波长分别位于514 nm和493 nm.电化学研究表明,在苯环上引入氟原子后,配合物的HOMO和LUMO间能隙增大(分别为0.12 eV和0.15 eV),与最大发光波长蓝移结果吻合.

New ligands N-isopropyl-2-phenyl-1H-benzoimidazole and N-isoprop-yl-2- （ 4-fluorophenyl ） -1 H-benzoimid- azole were prepared, and their corresponding cyclometalated complexes （ bi ） 2 Ir （ acac ） and （Ⅲ ） 2 Ir （ acac ） （ acac = acetylacetone） were synthesized by the reaction of these two ligands with IrC13and acetylacetone. The structures of the complexes were characterized by I H NMR and elemental analyses. The UV-vis and photoluminescence （PL） spectra were determined, and the electrochemical behaviors of the complexes were studied. The complexes had strong photolumi- nescence in dichloromethane at 514 nm and 493 nm, respectively. The electrochemical study showed that the energy gap between the HOMO and LUMO was enlarged by introducing fluorine on the benzene ring （0. 13 and 0. 15 eV respectively for two complexes） , which was in accordance with the blue shift of the maximum emission wavelength.