| Abstract
| - The synthesis and photophysical property of a dinuclear terbium complex, 2·Tb2, is described. Here, the Tb luminescence was significantly modulated in the presence of several mono- and bis-carboxylates in buffered aqueous solution.
- The synthesis and photophysical properties of a coordinatively unsaturated cationic dinuclear terbium complex,2·Tb2, that can detect the presence of mono- or bis(carboxylates) in buffered aqueous solution at physiological pHis described. Full ligand synthesis and structural characterization of 2·Na2 are also described. Spectroscopicmeasurements determined that each Tb(III) metal center has two metal-bound water molecules (q = 2). Therecognition or sensing of N,N-dimethylaminocarboxylic acid, 4, and the bis(carboxylate) terephthalic acid, 5, whichcan also function as sensitizing antennae, was found to occur through the binding of these carboxylates to themetal center via the displacement of the metal bound water molecules. This gave rise to the formation of luminescentternary complexes in solution in 2:1 or 1:1 (ion:2·Tb2) stoichiometry, respectively. Aliphatic bis(carboxylates) alsobind to 2·Tb2 where the selectivity for the ion recognition and stoichiometry was dictated by the structure of theanion, being most selective for pimelic acid, 6. Binding of either l- or d-tartaric acid gave rise to the formationternary complex formation, with 2:1 stoichiometry, where the ion recognition resulted in quenching of the lanthanideemission.
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