Issue 10, 2004

Tunable fluorescence emission in pyrene–(2,2′-bipyridine) dyads containing phenylene–ethynylene bridges

Abstract

A synthetic route is described for the preparation of a series of pyrene-containing π-conjugated 2,2′-bipyridine (bpy) ligands. These compounds have been investigated by steady-state and time-resolved fluorescence spectroscopy. They display intense visible absorption and fluorescence emission properties that can be very efficiently modulated by the complexation of zinc(II) metal ions to the bpy coordinating unit. The solvatochromism of the emission band of the zinc(II) complexes, the fluorescence quantum yields, and lifetimes in THF have been determined. Zinc(II)-induced formation of a charge transfer singlet excited states induces an increase in dipole moment of more than 20 D. Semiempirical theoretical calculations were performed and allowed to assess the electronic nature of ground and excited states of the free ligands 1 and 4 and that of the corresponding zinc(II) complexes.

Graphical abstract: Tunable fluorescence emission in pyrene–(2,2′-bipyridine) dyads containing phenylene–ethynylene bridges

Article information

Article type
Paper
Submitted
17 Jun 2004
Accepted
13 Sep 2004
First published
30 Sep 2004

Photochem. Photobiol. Sci., 2004,3, 949-959

Tunable fluorescence emission in pyrene–(2,2′-bipyridine) dyads containing phenylene–ethynylene bridges

S. Leroy-Lhez, A. Parker, P. Lapouyade, C. Belin, L. Ducasse, J. Oberlé and F. Fages, Photochem. Photobiol. Sci., 2004, 3, 949 DOI: 10.1039/B409250C

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