Abstract
Two tripodal ligands H3L1 and H3L2 containing imidazole rings have been prepared by the reaction of 1,10-phenanthroline-5,6-dione with 1,3,5-tris[(4-formylphenoxy)methyl]benzene and 1,3,5-tris[(2-formylphenoxy)methyl]benzene, respectively. Trinuclear Ru(II) complexes [(bpy)6Ru3H3L1–2](PF6)6 (bpy=2,2′-bipyridine) have been obtained by the condensation of Ru(bpy)2Cl2 · 2H2O with ligands H3L1 and H3L2, respectively. The pH effects on the UV–Vis absorption and emission spectra of both complexes have been studied, and ground- and excited-state ionization constants of both complexes have been derived. The photophysical properties of both complexes are strongly dependent on the solution pH. They act as pH-induced switchable luminescence sensors through protonation and deprotonation of the imidazole groups, with a maximum on–off ratio of 6 in buffer solution at room temperature.
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