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Issue 3, 2003
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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.

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

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Publication details

The article was received on 22 Oct 2002, accepted on 13 Dec 2002 and first published on 28 Jan 2003


Article type: Paper
DOI: 10.1039/B210361C
Citation: Photochem. Photobiol. Sci., 2003,2, 259-266
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    Tripodal ligand incorporating dual fluorescent ionophore: a coordinative control of photoinduced electron transfer

    J. P. Malval, R. Lapouyade, J. Léger and C. Jarry, Photochem. Photobiol. Sci., 2003, 2, 259
    DOI: 10.1039/B210361C

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