Issue 9, 2004
From the journal:

New Journal of Chemistry

Proton-assisted dissociation of a triple-stranded dinuclear europium helicate†

Mourad Elhabiri,a   Josef Hamacek,a   Nicolas Humbert,a   Jean-Claude G. Bünzlib  and  Anne-Marie Albrecht-Gary*a  

* Corresponding authors

a Laboratoire de Physico-Chimie Bioinorganique, UMR 7509 du CNRS, ECPM, Université Louis Pasteur, 25 rue Becquerel, Strasbourg, France
E-mail: amalbre@chimie.u-strasbg.fr
Fax: 33 (0) 3 90 24 26 39
Tel: 33 (0) 3 90 24 26 38

b Swiss Federal Institute of Technology Lausanne, Laboratory of Lanthanide Supramolecular Chemistry, BCH 1402, Lausanne, Switzerland
E-mail: jean-claude.bunzli@epfl.ch
Fax: 41 21 693 9825
Tel: 41 21 693 9821

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 (kD = 4(1) × 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.

Graphical abstract: Proton-assisted dissociation of a triple-stranded dinuclear europium helicate

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Article information

DOI
https://doi.org/10.1039/B405934D
Article type
Paper
Submitted
20 Apr 2004
Accepted
08 Jun 2004
First published
16 Aug 2004

New J. Chem., 2004,28, 1096-1099

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Proton-assisted dissociation of a triple-stranded dinuclear europium helicate

M. Elhabiri, J. Hamacek, N. Humbert, J. G. Bünzli and A. Albrecht-Gary, New J. Chem., 2004, 28, 1096 DOI: 10.1039/B405934D

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