Synthesis,characterization, spectroscopy and thermal analysis of rare earth picrate complexes with L-lysine |
| |
Authors: | T. S. Martins J. R. Matos G. Vicentini P. C. Isolani |
| |
Affiliation: | 1.Instituto de Química, Universidade de S?o Paulo;2.Instituto de Química, Universidade de S?o Paulo;3.Instituto de Química, Universidade de S?o Paulo;4.Instituto de Química, Universidade de S?o Paulo |
| |
Abstract: | Summary Rare earth picrate (RE) complexes with L-lysine (Lys) were synthesized and characterized. Elemental analysis (CHN), EDTA titrations and thermogravimetry data suggest a general formula RE(pic)3·2Lys·2H2O, where RE=La-Lu (without Pm) and Y, pic=picrate). IR spectra suggest that Lys is coordinated to the central ion through the nitrogen of the α-amino group. Parameters obtained from the absorption spectrum of the Nd compound indicated that the metal-ligand bonds are essentially electrostatic. Emission spectrum and biexponential behavior of the luminescence decay of the Eu compound suggest the existence of polymeric species. Thermogravimetric/derivative thermogravimetric (TG/DTG) and differential scanning calorimetry (DSC) curves of all complexes are very similar, with five events. The final products are the corresponding rare earth oxides and their X-ray diffraction patterns are identical to the calcinated oxides. |
| |
Keywords: | thermal analysis luminescence L-lysine rare earths picrates synthesis and characterization |
本文献已被 SpringerLink 等数据库收录! |
|