Highly Selective Phosphorescent Chemosensor for Fluoride Based on an Iridium(III) Complex Containing Arylborane Units
2008; American Chemical Society; Volume: 47; Issue: 20 Linguagem: Inglês
10.1021/ic800500c
ISSN1520-510X
AutoresQiang Zhao, Fuyou Li, Shujuan Liu, Mengxiao Yu, Zhiqiang Liu, Tao Yi, Chunhui Huang,
Tópico(s)Organic Light-Emitting Diodes Research
ResumoA new phosphorescent iridium(III) complex [Ir(Bpq)2(bpy)]+PF6− based on cyclometalated ligands (Bpq) containing a dimesitylboryl group was synthesized and characterized by photophysical and electrochemical studies. The excited-state properties of Bpq and [Ir(Bpq)2(bpy)]+PF6− were investigated using molecular orbital calculations. Importantly, both Bpq and [Ir(Bpq)2(bpy)]+PF6− could be used as highly selective chemosensors for a fluoride anion (F−) detected by the naked eye, owing to the interaction of the dimesitylboryl group (BMes2) with F−. For the Bpq ligand, a red shift of the emission spectrum was observed upon the addition of F−, which could be attributed to an excited-state switch from a π−π* transition to a charge-transfer transition upon complexation with F−. The addition of F− to a solution of [Ir(Bpq)2(bpy)]+PF6− induced a change in the solution color from yellow to orange-red and phosphorescent quenching, indicating that [Ir(Bpq)2(bpy)]+PF6− could act as an excellent ON−OFF-type phosphorescent chemosensor for F−.
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