Abstract
Two dinuclear Ru(II) complexes [{Ru(bpy)2}2(µ2-L1)](PF6)4 and [{Ru(bpy)2}2(µ2-L2)](PF6)4 carrying functionalized polypyridine unit were successfully synthesized, where L1=N,N′-[thiophene-2,5-diylbis(methylene)]bis(1,10-phenanthrolin-5-amine) and L2=N,N′-[furan-2,5-diylbis(methylene)]bis(1,10-phenanthrolin-5-amine). Fluorescence titration shows that complex [{Ru(bpy)2}2(µ2-L1)](PF6)4 displays high selectivity to SCN−, whereas complex [{Ru(bpy)2}2(µ2-L2)](PF6)4 shows no anion selectivity. Interferential experiment exhibits that the sensing ability of complex [{Ru(bpy)2}2(µ2-L1)](PF6)4 with SCN− is not influenced by the existence of other anions. At the same time, the possible interaction mechanism and binding site are expounded through theoretical calculations. A 1:1 binding mode between complex [{Ru(bpy)2}2(µ2-L1)](PF6)4 and SCN− is verified by the fluorescence titration, theoretical calculations, and ESI-MS spectrum.
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