新型稀土配合物的合成表征及EXAFS研究

Synthesis, Characterization and EXAFS of Novel Rare Earth Complexes

合成了五种新的稀土配合物RE_2(NO_3)_6L_2·nH_2O,其中L为一新的含β-双酮和Schiff-base配体1,5-双(1′-苯基-3′-甲基-5′-吡唑啉酮-4′)-1-(4′-氨基丁烷-1′-亚胺基)-5-戊酮,RE=Sm,Eu,Gd,Dy,Ho.对配合物进行了质谱、FTIR、变温红外、EXAFS等研究.结果表明:配合物为双核结构;配合物中NO_3^-以离子型、单齿及双齿同时存在;配体L中的C=O,C=N及NH_2均参与配位;稀土离子的总配位数为8,双配位层分别为2个氮和6个氧,RE—N距离在0.230～0.240nm,RE-O 0.240～0.250nm.

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 B - 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 layers. 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.