Synthesis, characterization and bioactivity of rare earth complexes with furoylpyrazolone-o-phenylenediamine

Eleven novel rare earth complexes [ RE (HPM alpha FP) (2)Pen (NO3)(2)] NO3 ( (HPM alpha FP)(2)Yen: N, N ' -bis[(1-phenyl-3-methyl-5-oxo-4-pyrazolinyl) alpha -furylmethylidyne]-o-phenylenediimine; RE = La, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Yb, Y) have been synthesized. They were characterized by IR, UV-visible, H-1 NMR, C-13 NMR, fluorescence, elemental analysis and molar conductance. The results show that the bis-Schiff base ligand is quadridentate and the rare earth ions are eight-coordinated in the complexes. The antibacterial experiment indicated that they have high antibacterial activities against S. aureus, B. subtillis, E. coli, E. carotovora and C. flaccumfaciens.