新型稀土配合物的合成表征及EXAFS研究

合成了五种新的稀土配合物RE2(NO3)6L2.nH2O, 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NO3^-以离子型、单齿及双齿同时存在; 配体L中的C=O, C=N及NH2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-O0.240~0.250nm。

Synthesis, characterization and EXAFS of novel rare earth complexes

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.