Abstract
Four iridium(III) complexes (L1)2Ir(stpip) (Ir1, L1 = 4-(trifluoromethoxy)phenylpyridine), (L2)2Ir(stpip) (Ir2, L2 = 2-(4-bromophenyl)pyridine), (L3)2Ir(stpip) (Ir3, L3 = 4-(2-pyridinyl)benzaldehyde), and (L4)2Ir(stpip) (Ir4, L4 = 6-(4-formylphenyl)nicotinaldehyde) using bis(diphenylphorothioyl)amide (stpip) as ancillary ligands were synthesized and fully characterized. Complexes Ir1−Ir4 exhibited blue to red emission with peaks ranging from 481 nm to 600 nm, all of which showed high photoluminescence quantum yields of 0.40–0.73. Upon addition of Hg2+ ions to the acetonitrile solutions of Ir1−Ir4, all these complexes displayed photoluminescence quenching and blue shift of the emission peaks, showing high selectivity. The detection limit for Hg2+ ions was as low as 10−8 M and that allowed monitoring Hg2+ ions in real water samples. Furthermore, Ir3 and Ir4 containing aldehyde groups showed remarkable specificity and anti-interference ability in the detection of cysteine (Cys). The reaction-type mechanism in sensing Hg2+ ions and Cys using these iridium complexes was studied in detail.
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