Five novel rare earth complexes RE2(NO3)6L2.nH2O have been synthesized, where L=1, 5-bis (1'-phenyl-3'-methyl-5'-pyrazolone-4')-1 -(4'-aminobutane-1'-imino)-5-pentaone, a new polydentate ligand containing β-diketone, Schiff-base and NH2 groups, RE=Sm, Eu, Gd, Dy, Ho. They were characterized by elemental analysis, mass spectra (FAB), FTIR, micro FTIR, variable temperature FTIR and extended X-ray absorption fine structure (EXAFS). The results indicate that the complexes are dimer. There are three types of NO3^- ions in the complexes, mono and didentate ligands and just anion as banlance ion. The C=O, C=N and NH2 groups all coordinated to rare earth. The coordination number is ca. eight. Two nitrogen and six oxygen atoms make up two coordinate alyers. The ranges RE-N is around 0.230~0.240nm and RE-O 0.240~0.250nm. The preliminary results of bioassay show that the compounds have fungicidal activities and can regulate the growth of plants. Some complexes have cardiovascular activities in vitro.

Key words: INFRARED SPECTROPHOTOMETRY, MASS SPECTROGRAPHY, NITRATE, PYRAZOLONE P, HOLMIUM COMPLEX, RARE EARTH METAL COMPLEX, SCHIFF BASE, EUROPIUM COMPLEX, EXTENDED X-RAY ABSORPTION FINE STRUCTURE SPECTROSCOPY, GADOLINIUM COMPLEX