ZnS nanoparticles sensitize luminescence of capping-ligand bound lanthanide ions
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2,6-Bis(diethylamide)-4-oxo(3-thiopropane)pyridine (BDP) and 2,6-bis(methyl ester)-4-oxo(3-thiopropane)pyridine (BMP) were synthesized. These compounds chelated LnIII爄ons and sensitized their emission. The 3:1 complexes of BDP displayed efficiencies of 18% and 12% for EuIII燼nd TbIII, respectively. The analogous complexes of BMP had efficiencies of 23% and 18% for EuIII燼nd TbIII, respectively. Both BDP and BMP were used to cap ZnS nanoparticles (NPs) in a one-pot synthesis, and then LnIII爄ons were added, resulting in systems with metal ions at the surface of the capped NPs. Photoexcitation of the EuIII燼nd TbIII爏ystems through NPs capped with these two ligands, with the carboxylato derivative of BMP [dicarboxylato-4-oxo(3-thiopropane)pyridine] and the nonchromophore 3-mercaptopropionate, resulted in sensitized LnIII-centered emission. The EuIII-containing systems displayed higher efficiencies in the range 0.04�23% than the corresponding TbIII-containing systems with efficiencies in the range 0.01�15%. The NPs capped with BDP were the exception; in this case, efficiencies of 0.36% and 0.79% for EuIII燼nd TbIII, respectively, were observed.