Efficient sensitized emission in Yb(III) pentachlorotropolonate complexes.

New Yb(III) complexes based on the pentachlorotropolonate (pctrop) ligand show enhanced infrared emission when excited in the orange organic chromophore. Yb(pctrop)(3)(DMF-d(7))(2) presents the highest reported quantum yield for a nonfluorinated infrared-emitting organolanthanide complex.

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