Synthesis, characterization, and pH-induced luminescence switching of two trinuclear Ru(II) polypyridyl complexes containing imidazole |
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| Authors: | Feixiang Cheng Jishu Chen Fan Wang Ning Tang Nengbang Hou Guang Chen |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Qujing Normal University, Qujing, 655011, People??s Republic of China
2. College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, People??s Republic of China
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| 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?C2](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?CVis 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?Coff ratio of 6 in buffer solution at room temperature. |
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