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Dual-emitting cyclometalated Ir(III) complexes with salicylaldimine-bound fluorophores for ratiometric oxygen sensing
Sirawit Tidma1, Gregory D Sutton1, Linh T M Dang1
1Department of Chemistry, University of Houston, 3585 Cullen Blvd. Room 112, Houston, Tx, 77204-5003, USA. tteets@uh.edu.
Abstract:
A new class of oxygen-sensing dual-emitting cyclometalated Ir(III) complexes is described. They function as ratiometric sensors that combine the blue fluorescence from coumarin as a self-referenced internal standard with yellow to red phosphorescence from bis-cyclometalated iridium complexes. The compounds have phosphorescence quantum yields up to 15%, lifetimes ranging from 0.23 to 9.4 μs, and are capable of sensing a wide range of O2 partial pressures.
