Probing Pb cation via the iridium based phosphorescent dye |
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Authors: | Mei-Lin Ho Yi-Ming Cheng Lai-Chin Wu Pi-Tai Chou Gene-Hsiang Lee Fang-Chi Hsu Yun Chi |
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Affiliation: | 1. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan;2. Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan |
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Abstract: | We demonstrate the concept of Pb2+ cation sensing using the emissive Ir(III) complex (1) based on the associated decrease of room-temperature phosphorescence upon forming the 1:1 adduct 1-Pb2+. Complex 1 bears two cyclometalated N-phenyl pyrazoles with pyrazoles residing at the mutual trans dispositions as well as one 3,5-di(pyridyl) pyrazolate chelate. X-ray structural analyses on the adduct 1-Pb2+ confirm the key function of 3,5-di(pyridyl) pyrazolate as it forms chelate interaction with the metal analytes, while quenching of phosphorescent emission is probably due to the Pb2+ induced perturbation, which increases the intersystem crossing to another lower-lying triplet state for the host chromophore via an enhanced spin–orbit coupling. |
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Keywords: | Iridium Phosphorescence Pyridyl pyrazolate Pb2+ Cation sensor |
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