Luminescent anion recognition: Probing the interaction between dihydrogenphosphate anions and Ru(II) polypyridyl complexes in organic and aqueous media.
Duff, Thomas and Grüßing, André and Thomas, Jean-Luc and Duati, Marco and Vos, Johannes G. (2003) Luminescent anion recognition: Probing the interaction between dihydrogenphosphate anions and Ru(II) polypyridyl complexes in organic and aqueous media. Polyhedron, 22 (5). pp. 775-780. ISSN 0277-5387
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A photophysical study of the interaction between dihydrogen phosphate anions and a series of ruthenium polypyridyl complexes containing anion receptor 4,4'-bis[(2-methoxyethyl)carbamoyl]-2,2'-bipyridine (L1) is reported. The complexes investigated are of the type [Ru(L)(L1)]X and [Ru(L1)]X, where L is 2,2'-bipyridyl or 1,10-phenanthroline and X is chloride or PF-. The emission properties of the compounds are studied as a function of the anion concentrations using emission lifetime and steady-state measurements. For the mixed ligand complexes the emission intensity and lifetime increases upon the addition of 2.5 molar equivalents of HPO-, further additions do not result in further increases. For [Ru(L1)]X the emission increases upon addition of the first 2.5 equivalents of dihydrogen phosphate, however, further increases lead to a decrease in both emission intensity and lifetime. The effect of the addition of trace amounts of water is also examined.
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