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Journal Article
Research Support, Non-U.S. Gov't
Phosphorogenic sensors for biothiols derived from cyclometalated iridium(III) polypyridine complexes containing a dinitrophenyl ether moiety.
Journal of Inorganic Biochemistry 2017 December
We report the synthesis and characterization of three cyclometalated iridium(III) polypyridine complexes containing a 2,4-dinitrophenyl ether moiety [Ir(pq)2 (N^N)](PF6 ) (Hpq=2-phenylquinoline; N^N=4-(N-(4-(2,4-dinitrophenoxy)benzyloxy)carbonyl)aminomethyl-4'-methyl-2,2'-bipyridine (bpy-dinitro-1) (1a), 4-(2,4-dinitrophenoxy)methyl-4'-methyl-2,2'-bipyridine (bpy-dinitro-2) (2a), 4-(4-(2,4-dinitrophenoxy)phenyl)-2,2'-bipyridine (bpy-dinitro-3) (3a)) as intracellular sensors for biothiols. Due to the quenching effect of the dinitroaromatic moiety, these complexes were extremely weakly emissive. Upon the reaction with biothiols, however, the emission was turned on as a consequence of the departure of the quenching unit. The results from a range of experiments demonstrated that complex 1a was noncytotoxic under the conditions used for confocal imaging, showed facile cellular uptake, and can serve as a phosphorogenic intracellular sensor for biothiols including glutathione (GSH) and hydrogen sulfide.
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