Synthesis and Characterization of Rare Earth Complexes with Phthalanilic Acids and Amino Acids
来源期刊：JOURNAL OF RARE EARTHS2000年第1期
论文作者：SHI Jin-chao WANG Zhen-jun PENG Xiao-qi JIA Ying-qi
Key words：rare earths; praseodymium; neodymium; phthalanilic acid; amino acids; energy interaction parameter;
Abstract: The complexes with the general formula REP3A.H2O[P=2-(COO)C6H4CONHC6H4X, X=2-Cl, 4-Br;A=Gly, Ala, Leu;RE=Pr3+, Nd3+] were synthesized and characterized by elemental analysis, IR and reflectance electronic spectra and TG methods. The results show that rare earth ion in each complex is coordinated by three oxygen atoms. One is from the amido and the other two from the hydroxyl in the carboxylate and the amino acid respectively, and each complex contains one coordinate water molecule. Condon parameters Fk, Lande parameters(ξ4f), Nephelanxetic ratio(β), percentage convalency parameter(δ) and bonding parameter(b1/2) of the chelates were calculated from the reflectance electronic spectra, indicating certain covalent character in the metal-ligand bond. The apparent decompose activation energies were evaluated and the decompose mechanism were discussed.
SHI Jin-chao1，WANG Zhen-jun1，PENG Xiao-qi1，JIA Ying-qi1
(1.Department of Chemistry, Northwest University, Xi′an 710069, China)
Abstract:The complexes with the general formula REP3A.H2O[P=2-(COO)C6H4CONHC6H4X, X=2-Cl, 4-Br;A=Gly, Ala, Leu;RE=Pr3+, Nd3+] were synthesized and characterized by elemental analysis, IR and reflectance electronic spectra and TG methods. The results show that rare earth ion in each complex is coordinated by three oxygen atoms. One is from the amido and the other two from the hydroxyl in the carboxylate and the amino acid respectively, and each complex contains one coordinate water molecule. Condon parameters Fk, Lande parameters(ξ4f), Nephelanxetic ratio(β), percentage convalency parameter(δ) and bonding parameter(b1/2) of the chelates were calculated from the reflectance electronic spectra, indicating certain covalent character in the metal-ligand bond. The apparent decompose activation energies were evaluated and the decompose mechanism were discussed.
Key words:rare earths; praseodymium; neodymium; phthalanilic acid; amino acids; energy interaction parameter;
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