SYNTHESIS, CHARACTERIZATION AND PHOTOLUMINESCENCEPROPERTIES OF NEW COUMARIN HYDRAZIDE AND ITS LANTHANIDE (III) COMPLEXES

A novel coumarin hydrazide ligand derived from the condensation of 7-hydroxy coumarin-4-ethylacetate with salicylaldehyde hydrazone and its complexes with Sm(III) and Eu(III) have been synthesized. The ligand and its complexes have been characterized by the Elemental analysis, Molar conductivity, FTIR, 1HNMR, and U.V. & Visible spectra. The complexes have stoichiometry of the type [Ln(L)2(H2O)2]NO3.2H2O where the ligand (HL) coordinates to the lanthanide ions Sm(III) and/or Eu(III) through azomethine nitrogen atom, phenolic oxygen of hydrazide moiety after deprotonation and ketonic oxygen of coumarin moiety. The fluorescence properties of complexes in different organic solvents (DMSO, DMF, Acetonitrile and Ethanol) have been studied. A strong red fluorescence of europium complex was observed and was attributed to the ligand energy transfers to the energy level of Eu(III).