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Synthesis And Characterization Of Four Series Of Different Structural Aromatic Carboxylic Acid Complexes With Rare Earth For Solid State Reaction At Low Temperature And Studies On Property Of Complexes

Posted on:2006-01-04Degree:MasterType:Thesis
Country:ChinaCandidate:R P ZhangFull Text:PDF
GTID:2121360155976479Subject:Inorganic Chemistry
Abstract/Summary:PDF Full Text Request
Four series and sixteen solid complexes of rare earth chloride with 1-naphthoic acid (L1),benzoic acid (L2),phenylacetic acid (L3) and Mandelic acid (L4) have been synthesized by method of solid state reaction at low temperature,and then these complexes were characterized by chemical analysis methods. Elemental analysis, rare earth coordination titration and TGA studies suggest that the composition of the complexes is RE(L1)3 · nH2O (n=01) ,RE(L2)3 · nH2O (n= 0.5-1.5) ,RE(L3)3· nH2O (n=0.51.5) and RE(L4)3· 4H2O (RE=La, Nd, Eu, Tb) respectively. IR spectra and 1HNMR studies indicated that the coordinationfashion of four ligands with RE(III) is different. The ligand(L1) is bonded with RE(III) ions by two oxygen atoms in carboxyl group which coordinate as an asymmetrical bridging bidentate group. The ligand(L2) is bonded with RE(III) ions by two oxygen atoms in carboxyl group which coordinate as a chelate-bridging tridentate group. The ligand(L3) is bonded with RE(III) ions by two oxygen atoms in carboxyl group which coordinate as a symmetrical chelate bidentate group. The ligand (L4) is bonded with RE(III) ions by the one oxygen atom in the carboxyl group and the oxygen atom in the hydroxyl group. The Molar conductivity in DMSO solvent indicates that all complexes are non-electrolyte. Fluorescence spectra of Eu3+ and Tb3+ complexes and Phosphorescence Spectra of ligands show that all of four ligands have sensitized differently RE3+ ions in fluorescence intensity. It indicates that the triplet state energy of ligands and the different structure of complexes play an important role in luminescence of complexes. The four products are measured by SEM. The images indicate that particle diameter and the shape of La(L2)3 ? O.5H2O are similar to one dimensional nanometer stick.
Keywords/Search Tags:Solid state reaction at low temperatures, phenylacetic acid, benzoic acid, 1-naphthoic acid, Mandelic acid, rare earth chloride, property
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