Synthesis,photophysical, electrochemical,and ion-binding properties of Ru(II) polypyridyl complexes containing benzo-15-crown-5 |
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Authors: | Feixiang?Cheng author-information" > author-information__contact u-icon-before" > mailto:chengfx@.com" title=" chengfx@.com" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Ning?Tang,Pinhua?Liu,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 polypyridyl ligands, 5-(4′-ethynylbenzo-15-crown-5)-2,2′-bipyridine (L1) and 3-bromo-8-(4′-ethynylbenzo-15-crown-5)-1,10-phenanthroline (L2), and their Ru(II) complexes [(bpy)2RuL](PF6)2 have been prepared and characterized. Both complexes exhibit metal-to-ligand charge transfer absorption at around 452 nm and emission at around 640 nm in MeCN solution. Electrochemical studies of the complexes reveal a Ru(II)-centered oxidation at around 1.31 V and three ligand-centered reductions. The binding ability of the complexes with Na+ has been investigated by UV/Vis absorption, emission, and electrochemical titrations. Addition of Na+ to MeCN solutions of both complexes results in a progressive enhancement of the emission, a red-shift of the UV/Vis absorption, and a progressive cathodic shift of the Ru(II)-centered E 1/2 couple. The stability constants for the 1:1 stoichiometry adducts of the complexes with Na+ have been obtained from the UV/Vis absorption titrations. |
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