Photophysics of Calix[4]biscrown-Based Ditopic Receptors of Caesium Containing One or Two Dioxocoumarin Fluorophores |
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Authors: | Isabelle Leray Zouhair Asfari Jacques Vicens Bernard Valeur |
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Affiliation: | CNRS UMR 8531, Laboratoire PPSM, Département de Chimie, ENS-Cachan, 61 Av. du Président Wilson, F-94235 Cachan, France. |
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Abstract: | The ditopic receptors Calix-COU1 and Calix-COU2 consist of a calix[4]biscrown containing one or two dioxycoumarin fluorophores, respectively, inserted into the crown. They can form 1:1 and 2:1 (metal:ligand) complexes with caesium ions. The photophysical properties of the 1:1 complexes can be explained by (i) cation tunneling through the tube-shaped cavity (composed of the four phenyl rings) of the calix[4]biscrown, (ii) photodisruption of the interaction between the bound cation and the oxygen atoms belonging to both the coumarin moiety and the crown, (iii) photoinduced motions of the cation. |
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Keywords: | photophysics caesium molecular sensor coumarin calix[4]arene |
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