Journal
INORGANIC CHEMISTRY
Volume 47, Issue 22, Pages 10269-10279Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic8012975
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Funding
- French Agence Nationale de la Recherche [ANR LnOnL NT05-3_42676]
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The multistep synthesis of an extensive series of push-pull donor-pi-conjugated dipicolinic acid ligands is described. The charge transfer character of the ligand can be tuned by changing the donor group (CH2R, OR, SR, or NR2) or the nature of the conjugated backbone (phenyl, phenylethynyl, naphtylethynyl, bis(phenylethynyl), or chalcone). The photophysical properties of related D-3 symmetric europium complexes (absorption and luminescence) were measured. Experiments using two-photon sensitized luminescence of a Eu-III complex reveal large two-photon absorption (TPA) cross-section values (775 GM at 740 nm) in dichloromethane. Furthermore, some structure-property relationships can be derived from this systematic study, allowing an optimization of TPA properties of lanthanide complexes.
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