A dipicolylamine-appended cyclometalated iridium(III) complex: Synthesis, characterization and metal ions recognition

作者：Li, Xianghong^*; Lan, Huajun; Chen, Yuanbing; Lv, Kangle; Zhang, Aiqing; Huang, Tao

来源：Inorganica Chimica Acta, 2012, 390: 41-46.

DOI：10.1016/j.ica.2012.03.053

• Iridium complex
• Bipyridine
• DPA
• Chemo-sensor
• Heavy-metal ions
• Phosphorescence

A new phosphorescent dye (complex 1) containing iridium cyclometalated complex as fluorophore and di(2-picolyl)amine (DPA), connected to the 4,4'-positions of the bipyridine unit through >C=O, as recognition group was synthesized and characterized. The UV-Vis absorption and luminescence properties of 1 were investigated with heavy-metal ions as well as Zn2+, Cd2+, Co2+, Ni2+, Ag+, Fe2+, Mn2+, Hg2+, Pb2+ and Cu2+. The emission intensities of complex 1 were strongly quenched by the addition of Cu2+, Zn2+ and Hg2+. The binding constants (K-s) and stoichiometry of complex 1 were calculated from luminescence titration data, with values of K-s = 3.09 x 10(5) M-1 (Cu2+), 5.75 x 10(4) M-1 (Zn2+) and 1.90 x 10(4) M-1 (Hg2+), respectively. Therefore, 1 exhibited high selectivity and efficient signaling behavior to Cu2+ over Zn(II), Hg(II) and other metal ions.

• 出版日期2012-7-15
• 单位中南民族大学