Probing Pb2+ cation via the iridium based phosphorescent dye
Journal
Polyhedron
Journal Volume
26
Journal Issue
17
Pages
4886-4892
Date Issued
2007
Author(s)
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. © 2007 Elsevier Ltd. All rights reserved.
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Type
journal article
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