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Tripodal ligand incorporating dual fluorescent ionophore: a coordinative control of photoinduced electron transfer

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Abstract

p-(N, N-Dimethylamino)benzenesulfonamide (DMABSA), a dual fluorescent fluorophore, has been derivatized into two new fluoroionophores for transition metal cations. The electron-acceptor sulfonamide group has been N-substituted by a 2-pyridylmethylene group to lead to a bidentate ligand which forms a 2:1 complex with Cu(ii). The crystal structure of the copper(ii) complex is reported. The Cu(ii) is coordinated through the pyridine N- and sulfonamide N-deprotonated atom which account for the blue-shift of the absorption and the partly quenched fluorescence. When DMABSA was incorporated into the tris(2-aminoethyl)amine (tren), a tripodal, dual-fluorescent ligand, is obtained which shows higher binding affinity for Zn(ii) than for Cu(ii). Furthermore, the large increase of the short wavelength emission and the disappearance of the TICT emission, upon Zn complexation, allow measurements of the Zn(ii) concentration from relative fluorescence intensity at two wavelengths.

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Authors and Affiliations

  1. Laboratoire d’Analyse Chimique par Reconnaissance Moléculaire (LACReM), Ecole Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB), 33607, Pessac Cedex, France

    Jean Pierre Malval & René Lapouyade

  2. Laboratoire de Chimie Physique et Cristallographie, EA Pharmacochimie, Université Victor Segalen Bordeaux 2, 33076, Bordeaux Cedex, France

    Jean-Michel Léger & Christian Jarry

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  1. Jean Pierre Malval
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  2. René Lapouyade
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  3. Jean-Michel Léger
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  4. Christian Jarry
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Dedicated to Professor Jean Kossanyi on the occasion of his 70th birthday.

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Malval, J.P., Lapouyade, R., Léger, JM. et al. Tripodal ligand incorporating dual fluorescent ionophore: a coordinative control of photoinduced electron transfer. Photochem Photobiol Sci 2, 259–266 (2003). https://doi.org/10.1039/b210361c

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