Sensitized luminescence from novel pyrazolone based â-diketonate complexes of Eu³⁺

New pyrazolone based fluorinated ligand, 3-methyl 4-(2, 2, 3, 3, 3-penta fluoro-1-hydroxypropylidene)-1-phenyl-1H-pyrazol-5(4H)-one has been synthesized and well characterized. Europium-containing complexes were synthesized by adduct formation between 3-methyl 4-(2, 2, 3, 3, 3-penta fluoro-1-hydroxypropylidene)-1-phenyl-1H-pyrazol-5(4H)-one and europium (III) complex and a bidentate neutral donor 1, 10-phenanthroline (phen). The emission spectra of the complexes display characteristic sharp peaks in the 575–700 nm region associated with the ⁵D₀ _⁷F_J (J = 0–4) transitions of the Eu³⁺ ion.