Synthesis and fluorescence properties of Sm-2-oxo-quinoline-3-carbaldehyde-isonicotinyl hydrazone decorated with 1,10-phenanthroline

• A novel hydrazone ligand based on quinoline was designed and synthesized.
• The reason for no characteristic fluorescence of Sm(III) complex was discussed.
• A novel ternary Sm(III) complex was synthesized by introducing 1,10-phenanthrolin.
• The ternary complex showed efficient luminescence through an energy-transfer pathway.

A novel ligand called 2-oxo-quinoline-3-carbaldehyde-isonicotinyl hydrazone (L) was designed and synthesized, and its Sm(III) complex was successfully prepared and characterized by X-ray diffraction. According to investigation, the Sm(III) complex didn’t exhibit characteristic fluorescence due to the mismatching energy between L and Sm(III) ion. However, when the complex was reacted with 1,10-phenanthrolin (Phen) as a secondary ligand, a novel ternary Sm(III) complex was synthesized, which showed efficient luminescence activity through an energy-transfer pathway. These results indicated that 1,10-phenanthrolin was an excellent sensitizer to Sm(III) ion.

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