Jean-Claude Bunzli - Modulating the Photophysical Properties of Azamacrocyclic Europium Complexes with Charge-Transfer Antenna Chromophores

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  Bourdolle,A., Allali,M., Mulatier,J.C., Le Guennic,B.,   Zwier,J.M., Baldeck,P.L., Bunzli,J.C.G., Andraud,C., Lamarque,L.,   Maury,O. Inorganic Chemistry 2011  50 (11) 4987-4999

  Abstract: Two europium complexes with   bis(bipyridine) azamacrocyclic ligands featuring pendant arms   with or without pi-conjugated donor groups are synthesized and   fully characterized by theoretical calculations and NMR   spectroscopy. Their photophysical properties, including   two-photon absorption, are investigated in water and in various   organic solvents. The nonfunctionalized ligand gives highly   water-stable europium complexes featuring bright luminescence   properties but poor two-photon absorption cross sections. On the   other hand, the europium complex with an extended conjugated   antenna ligand presents a two-photon absorption cross section of   45 GM at 720 nm but is poorly luminescent in water. A detailed   solvent-dependent photophysical study indicates that this   luminescence quenching is not due to the direct coordination of   O-H vibrators to the metal center but to the increase of   nonradiative processes in a protic solvent induced by an internal   isomerization equilibrium

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