Curcuminoid ligands for sensitization of near-infrared lanthanide emission.

Autor: Seltzer MD; Chemistry and Materials Division, Naval Air Warfare Center, 1900 N. Knox Road Stop 6303, China Lake, California 93555-6106, USA. michael.seltzer@navy.mil, Fallis S, Hollins RA, Prokopuk N, Bui RN
Jazyk: angličtina
Zdroj: Journal of fluorescence [J Fluoresc] 2005 Jul; Vol. 15 (4), pp. 597-603.
DOI: 10.1007/s10895-005-2832-8
Abstrakt: Fluorescent lanthanide complexes were synthesized using a non-phenolic analog of curcumin as the principal chromophoric chelating ligand. Sensitized, near-infrared fluorescence is observed in these complexes as a result of photo-excitation of the chromophoric ligands, population of the molecular triplet state, and transfer of energy to the emitting lanthanide ion. For the purpose of intra-molecular energy transfer, the triplet states of curcuminoid ligands are more favorably matched with the excited electronic states of neodymium and ytterbium ions than those associated with less conjugated beta-diketonate ligands. Sensitization of fluorescence through an internal redox reaction, thought to occur in other ytterbium complexes, is predicted to be less probable under the present circumstances.
Databáze: MEDLINE