Jean-Claude Bunzli - Proton-assisted dissociation of a triple-stranded dinuclear europium helicate

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  Publication Details (including relevant citation   information):

  Elhabiri,M., Hamacek,J., Humbert,N., Bunzli,J.C.G.,   Albrecht-Gary,A.M. New Journal of Chemistry  2004 28 (9) 1096-1099

  Abstract: A fruitful combination of absorption   and gated luminescence spectrophotometry allowed us to gain   insight into the proton-assisted dissociation of a   triple-stranded dinuclear europium helicate in water. This   process involves a key dimetallic double-stranded complex Eu2L2   as already observed in the self-assembly process of the triple   helicate. The slow unravelling of the first strand, which is   triggered by the protonation of its two carboxylate groups,   dominates the whole disentangling mechanism of the supramolecular   edifice. The solvolytic dissociation in water is rather slow   (k(D) = 4(1) x 10(-4) s(-1)) and is catalysed by H+ ions (k =   0.12(3) M-1 s(-1)). These lanthanide helicates, which are   characterised by high kinetic inertness over a wide range of pH   and high thermodynamic stability in water, are promising building   blocks for the development of novel fluorescent biomarkers

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