Bao Jin-Rong, Zhu Xiao-Wei, Wang Xin-Bo, Zhao Yong-Liang
The College of Chemistry & Chemical Engineering, Inner Mongolia University, Hohhot 010021, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2008 Mar;28(3):527-9.
Seven solid complexes of proportional mixed complexes (Eu3+ mixed with La3+) of rare earth perchlorate with the 2-thiophene carboxylic acid and 1.10-phenanthroline were synthesized. By elemental analysis, coordination titration and molar conductance measurement, the composition of the complexes were suggested to be (Eu(1-x)La(x)) x L3 x phen x 1/2H2O (x = 0.000-0.200, L as 2-thiophene carboxylic acid and phen for 1.10-phenanthroline) respectively. The ligands and coordination compounds were studied by means of IR spectra and fluorescence excitation and emission spectra. The molar conductivities in DMF solvent suggested that the complexes are nonelectrolyte. IR spectra studies indicate that the 2-thiophene carboxylic acid ligands bonded with RE(II) through oxygen atoms in carboxyl group and 1.10-phenanthroline ligand is bonded to RE(III) through nitrogen atoms. In the fluorescence spectra it was found that the Eu3+ complex has no symmetrical center. La3+ has a great influence on the luminescence of Eu3+. The fluorescence emission intensity of Eu3+ was enhanced by La3+ and the fluorescence intensity with x = 0.050 is much higher. With La3+ concentration increasing the luminescence of Eu3+ is less intense.
合成了稀土高氯酸盐与2-噻吩羧酸和1,10-菲啰啉形成的比例混合配合物（Eu³⁺与La³⁺混合）的七种固态配合物。通过元素分析、配位滴定和摩尔电导率测量，推测配合物的组成分别为(Eu(1 - x)La(x))xL₃xphenx1/2H₂O（x = 0.000 - 0.200，L为2-噻吩羧酸，phen为1,10-菲啰啉）。通过红外光谱、荧光激发光谱和发射光谱对配体和配位化合物进行了研究。在DMF溶剂中的摩尔电导率表明配合物为非电解质。红外光谱研究表明，2-噻吩羧酸配体通过羧基中的氧原子与RE(II)键合，1,10-菲啰啉配体通过氮原子与RE(III)键合。在荧光光谱中发现Eu³⁺配合物没有对称中心。La³⁺对Eu³⁺的发光有很大影响。La³⁺增强了Eu³⁺的荧光发射强度，x = 0.050时的荧光强度更高。随着La³⁺浓度的增加，Eu³⁺的发光强度减弱。
