Journal
DALTON TRANSACTIONS
Volume 48, Issue 14, Pages 4565-4573Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8dt04901g
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Funding
- NRF grant - MSIP [2018R1A2B2001293]
- National Research Foundation of Korea [2018R1A2B2001293] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Since abnormal levels of hydrogen sulphide (H2S) correlate with various diseases, simple methods for its rapid and sensitive detection are highly required. Herein, we introduce a new electrochemiluminescent probe 1 for H2S based on a cyclometalated iridium(iii) complex. o-(Azidomethyl)benzoate ester groups on the main ligands of probe 1 react selectively with H2S, resulting in cascade reactions involving H2S-mediated reduction and intramolecular cyclization/ester cleavage. With this structural change induced by H2S, the intrinsic electrochemiluminescence (ECL) of 1 decreased greatly due to the unfavourable electron transfer of a tripropylamine (TPA) radical. Probe 1 showed a high ECL turn-off ratio and good selectivity for H2S over various anions and biothiols. The sensing mechanism of H2S was elucidated using H-1 NMR spectroscopy and MALDI-TOF mass spectrometry analyses.
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