Publications (1)3.56 Total impact
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ABSTRACT: Several azaxanthone and azathioxanthone sensitizing chromophores have been incorporated into macrocyclic ligands and formed well-defined Eu and Tb complexes in polar media. Ecitation of the heterocyclic chromophore in the range 330 to 382 nm leads to modest amounts of aromatic fluorscence. Substituted acetophenones, benzophenons and acridones have been incorporated into ligand structures to promote lanthanide sensitization. A small library of substituted 1-azaxanthones and 1-azathioxanthones was prepared, in order to analyze the effect of varying the nature and position of substituents in the benzenoid ring on both their singlet and triplet energies. Fluoroscence emission for the 1-azathioxanthone examined was weak unless donor N or O lone-pairs were introduced into the chromophores.
Durham, England, United Kingdom
- Department of Chemistry