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Abstract
Two lanthanide complexes, (mnH)2[EuIII(egta)]2·6H2O (1) (H4egta = ethyleneglycol-bis-(2aminoethylether)-N,N,N′,N′-tetraacetic acid) and (mnH)4[EuIII2(dtpa)2]·6H2O (2) (H5dtpa = diethylenetriamine-N,N,N′,N″,N″-pentaacetic acid), have been synthesized and characterized by FT-IR spectroscopy, thermal analysis, and single-crystal X-ray diffraction. X-ray diffraction reveals that 1 is multinuclear nine-coordinate and crystallizes in the monoclinic crystal system with space group C2/c. The obtained cell dimensions are a = 38.513(3) Å, b = 13.5877(8) Å, c = 8.7051(5) Å, β = 99.6780(10)°, and 4490.6(5) Å3. Each methylamine (mnH+) cation in 1, through hydrogen bonds, connects three adjacent [EuIII(egta)]− anions. The [EuIII(egta)]− anions connect one another forming a 1-D multinuclear zigzag chain structure along the c-axis. Complex 2 is nine-coordinate binuclear structure with tricapped trigonal prismatic conformation and crystallizing in the monoclinic crystal system, but with space group P21/n. The obtained cell dimensions are a = 9.9132(8) Å, b = 24.1027(18) Å, c = 10.7120(10) Å, β = 109.1220(10)°, and 2418.2(3) Å3. For 2, there are two kinds of methylamine cations (mnH+) connecting [EuIII2(dtpa)2]4− complex anions and lattice waters through hydrogen bonds, leading to formation of a 2-D ladder-like layer structure.
Acknowledgements
The authors greatly acknowledge the National Science Foundation of China (21371084), Liaoning Provincial Department of Education Innovation Team Projects (LT2012001), Shenyang Science and Technology Plan Projects (F12-277-1-15) and Liaoning University “211” Engineering Construction Projects for financial support. The authors also thank our colleagues and other students for their participation in this work.