title: [Spectroscopy and thermostability of series rare-earth complexes with 3-nitrophthalic acid].
abstract: A series of rare-earth compound RE2L2 (HL)2 (H2O)6 x 2H2O (RE=La, Nd, Eu, Tb, Er, Y) containing 3-nitrophthalic acid (H2L) ligand were synthesized from ethanol-water solution, and characterized and investigated by the element analysis, infrared and ultraviolet absorption spectra and different thermal-thermogravimetric analysis. The results of the spectroscopic analysis were conformed to the crystal structures determined by X-ray diffraction, showing that the carboxylate (-COO-) and carboxyl (-COOH) groups of the ligand link to the rare-earth ions by bridging and terminal mode respectively. Two rare-earth ions were linked by two di-deprotonated ligand L(2-) in bridging-chelating mode to form a dinuclear structure, and coordinated by the other two mono-deprotonated ligands HL-in terminal chelating mode using their carboxylate (-COO-) and carboxyl (-COOH) group together, respectively. The IR spectra shows the existence of the carboxylate (-COO-) and carboxyl (-COOH) group and the hydrogen bond interactions between the carboxyl (-COOH) group and crystal water. The DTA-TGA data were consistent with the composition of compounds, exhibiting an endothermic peak of the loss of the crystal and coordinated waters at about 150 degrees C and two exothermic peaks of the oxidation and decomposition of ligands in the rang of about 340 to 460 degrees C.
authors.affiliation: Department of Chemistry, Capital Normal University, Beijing 100037, China. sailsss@126.com
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Yu-Heng
authors.initials: YH
authors.lastname: Deng
authors.forename: Hui-Ju
authors.initials: HJ
authors.lastname: Zhu
authors.forename: Yong-Li
authors.initials: YL
authors.lastname: Yang
authors.forename: Shao-Ting
authors.initials: ST
authors.lastname: Wang