Abstract
Understanding the relationship between structure and properties is critical to the development of solid-state luminescence materials with desired characteristics and performance optimization.In this work,we elaborately designed and synthesized a pair of mononuclear iridium(Ⅲ)complexes with similar struc-tures but different degrees of cationization.[Ir2-f][2PF6]with two counterions is obtained by simple N-methylation of the ancillary ligand of[Ir1-f][PF6]which is a classic cationic iridium(Ⅲ)complex.Such a tiny modification results in tremendously different optical properties in dilute solutions and powders.[Ir1-f][PF6]exhibits weak light in solution but enhanced emission in solid-state as well as poly(methyl methacrylate)matrix,indicative of its aggregation-induced emission(AIE)activity.On the sharp con-trary,[Ir2-f][2PF6]is an aggregation-caused quenching(ACQ)emitter showing strong emission in the iso-lated state but nearly nonemissive in aggregation states.Benefiting from the appealing characteristics of mechanochromic luminescence and AIE behavior,[Ir1-f][PF6]has been successfully applied in reversible re-writable data recording and cell imaging.These results might provide deep insights into AIE and ACQ phenomenon of iridium(Ⅲ)complexes and facilitate the development of phosphorescent materials with promising properties.
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