Preparation and Properties of Complex of Europium Lanthanum with Crown Ether and p-phthalic Acid
ZHAO Yong-liang1，2, ZHAO Feng-ying3，HAO Zhong-xi1
1. College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China 2. State Key Lab of Rare Earth Materials Chemistry and Applications, Peking University, Beijing 100871, China 3. Department of Fundament, Inner Mongolia Agriculture University, Hohhot 010019, China
Abstract：Two complexes of crown ether europium(EuL) and crown ether lanthanum(LaL) were synthesized by europium perchlorate and lanthanum perchlorate with 18-crown-6(18-C-6) respectively. The heternuclear complexes of europium-lanthanum p-phthalic acid crown ether were prepared by the two complexes (EuL and LaL) with p-phthalic acid. The elemental analysis shows that its composition is EuLaL2L′(ClO4)4·6H2O(L＝18-C-6 and L′=p-C6H4(COO)2). The IR spectra, UV-spectra and molar conductor indicate that both ligands(L and L′) coordinate rare earth ions (Eu3＋ and La3＋), but perchlorate group is free. The fluorescence spectra show that the fluorescence intensities of the complex of heternuclear (EuLaL2L′(ClO4)4·6H2O) are more than eight times that of the crown ether europium complex. It was shown that the linked ligand (p-phthalic acid) can transfer the absorbed energy of Lanthanum-crown ether to europium-crown ether with high efficiency.
[1] Alpha J, Lehn M. Photo. Chem. and photobio., 1990, 52(2): 299. [2] YU Jiang et al(于 江等). Acta Chemica Sinica(化学学报)，1997，55：153. [3] DONG Wen-kui et al(董文魁等). Chinese Rare Earth(稀土), 1995, 16(1): 42. [4] YANG Xiao-hua, MO Ri-gen, ZHAO Yong-liang(杨晓华，莫日根，赵永亮). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2002，22(2)：223. [5] LIANG Ying-qiu et al(梁映秋等). Acta Chemica Sinica(化学学报)，1983，41(3)：198. [6] B J Hathaway, Underhill A E. J. Chem. Soc., 1961, 65(8): 3091. [7] MAO Jiang-gao et al(毛江高等). Journal of Inorganic Chemistry(无机化学学报)，1994，10(4)：339. [8] Geary W J. Coord. Chem. Rev., 1971,(7): 81.
