BATAT, Pinar; VIVES, Guillaume; BOFINGER, Robin; CHANG, Ren-Wei; KAUFFMANN, Brice; ODA, Reiko; JONUSAUSKAS, Gediminas; MCCLENAGHAN, Nathan D.

doi:10.1039/C2PP25130B

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BATAT, Pinar
Laboratoire Ondes et Matière d'Aquitaine [LOMA]
Institut des Sciences Moléculaires [ISM]

VIVES, Guillaume
Institut des Sciences Moléculaires [ISM]

BOFINGER, Robin
Institut des Sciences Moléculaires [ISM]

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Ce document a été publié dans

Photochemical & Photobiological Sciences. 2012, vol. 11, n° 11, p. 1666-1674

Springer

Résumé en anglais

Efficient Ca2+-switched fluorescent sensors, where fluorescence output is governed by a light-activated ion-gated electron transfer pathway, can be obtained on combining BODIPY chromophores with a readily oxidized biocompatible and selective BAPTA receptor. Herein we report the synthesis and studies of two such conjugates, which vary in the nature of the spacer separating the two electroactive components, namely none (1) or phenyl (2). Single crystal X-ray crystallography and molecular modelling structures and calculations give information on molecular and electronic structure, while steady-state fluorescence experiments show high Ca2+-induced fluorescence enhancement factors of 122 and 23 and Kd values of 0.50 μM and 0.13 μM for 1 and 2, respectively. Notably, studies of the ultrafast photoinduced processes (through transient absorption spectroscopy) give access to electron transfer dynamics in pseudophysiological media as well as in a polar non-protic solvent and information about the fate of the excited molecules in the presence and absence of calcium. In water, electron transfer rates as high as 3.3 × 1012 s−1 and 8.3 × 1011 s−1 are measured for the ion-free, directly connected conjugate and the variant incorporating a phenyl spacer, respectively. This electron transfer pathway is efficiently blocked by the presence of an ion, restoring fluorescence.< Réduire

DOI

http://dx.doi.org/10.1039/C2PP25130B

Projet Européen

Communication between Functional Molecules using Photocontrolled Ions

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Laboratoire Ondes et Matière d'Aquitaine (LOMA) - UMR 5798