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• 作者：B. Li ; C. Qin ; D. Y. Kong ; J. Wang
• 刊名：Russian Journal of Coordination Chemistry
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：42
• 期：3
• 页码：207-216
• 全文大小：1,169 KB
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• 作者单位：B. Li (1)
  C. Qin (1)
  D. Y. Kong (1)
  J. Wang (1)
  
  1. Department of Chemistry, Liaoning University, Shenyang, 110036, P.R. China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Inorganic Chemistry
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3318

文摘

Two novel lanthanide complexes, (EnH)[LuIII(Egta)] · 2H₂O (I) and (EnH₂)[YIII(Egta)H₂O]₂ · 6H₂O (II), where En = ethylenediamine and H₄Egta = ethyleneglycol-bis-(2-aminoethylether)-N,N,N′,N′-tetraacetic acid, have been successfully synthesized through direct heating reflux and their molecular crystal structures were determined by FT-IR spectroscopy, thermal analysis and single crystal X-ray diffraction techniques (CIF files CCDC nos. 966211 (I) and 966210 (II)). X-ray diffraction reveals that I has a eight-coordinate mononuclear structure with distorted square antiprismatic conformation. The reason that the Lu(III) adopts a eight-coordinate conformation is the small ionic radius and more f-orbital electrons, which generates a relatively small coordination number. Complex I crystallizes in a orthorhombic system with Pca2₁ space group. The crystal data are as follows: a = 22.4933(14), b = 9.1067(7), c = 10.6450(5) Å and V = 2180.5(2) Å3. Complex II takes nine-coordinated structure with a monocapped square antiprism, and crystallizing in the monoclinic crystal system with P2₁/c space group. The cell dimensions are as follows: a = 12.9600(11), b = 12.6209(12), c = 16.9151(15) Å, β = 122.021(2)° and V = 2345.8(4) Å3. Each ethylenediammonium (EnH ₂ 2+ ) cation in (EnH₂)[YIII(Egta)H₂O]₂ · 6H₂O (II) connects three adjacent [YIII(Egta)(H₂O)] ₂ 2- anions through hydrogen bonds. While in II, there are two types of EnH ₂ 2+ cations, which form hydrogen bonds with the neighboring [YIII(Egta)(H₂O)] ₂ 2- anions, leading to the formation of a 2D ladder-like layer structure. The results showed that the ionic radius of rare earth metals play a crucial role in crystal and molecular structure of their complexes.