A series of pyrazolone lanthanide (III) complexes : Synthesis, crystal structures and fluorescence

Abstract A series of pyrazolone lanthanide complexes: Ln(PMPP) 3  · 2H 2 O · C 2 H 5 OH (Ln = Nd ( 1 ), Sm ( 2 ), Gd ( 3 ), Dy ( 4 ); PMPP = 1-phenyl-3-methyl-4-propionyl-5-pyrazolone) have been synthesized by the hydrothermal method with the starting ligand PMPP-SAH (1-phenyl-3-methyl-4-(salicylidene hydrazone)-propionyl-5-pyrazolone) changed into PMPP during the formation process of complexes. All the complexes were structurally characterized by X-ray crystallography. The fluorescence of these four complexes 1–4 in solid state and DMF solution was investigated via F-4500 spectrophotometer and all of them indicate a fluorescent behavior at room temperature.