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

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...

Full description

Saved in:
Bibliographic Details
Published in:Photochemical & photobiological sciences 2003-03, Vol.2 (3), p.259-266
Main Authors: Malval, Jean Pierre, Lapouyade, René, Léger, Jean-Michel, Jarry, Christian
Format: Article
Language:English
Subjects:
Benzenesulfonamides
Copper - analysis
Fluorescence
Fluorescent Dyes - chemical synthesis
Fluorescent Dyes - chemistry
Ionophores - chemical synthesis
Ionophores - chemistry
Ligands
Photochemistry
Sulfonamides - chemistry
Transition Elements - analysis
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1474-905X
1474-9092
DOI:10.1039/b210361c