Lamp-Shaped Octametallic Lanthanide [Ln8SiO4] Clusters Based on a μ 4-Silicate-Bridge Core

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• 作者：Shi-Xiong She ; Yanmei Chen ; Dandan Gao ; Yahong Li ; Wu Li
• 关键词：Octametallic cluster ; Crystal structure ; Lanthanide ; Silicate ; Magnetic properties
• 刊名：Journal of Cluster Science
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：27
• 期：2
• 页码：691-701
• 全文大小：818 KB
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• 作者单位：Shi-Xiong She (1)
  Yanmei Chen (1)
  Dandan Gao (2)
  Yahong Li (1)
  Wu Li (2)
  
  1. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
  2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Inorganic Chemistry
  Physical Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-8862

文摘

The employment of silicate ion, SiO₄ 4−, as a ligand in the coordination chemistry of lanthanides is reported. A series of octanuclear clusters of general formula [Ln₈L₈(C₆H₄NH₂COO)₄SiO₄] (H₂L = 2-{[(2-hydroxy-3-methoxy-phenyl)methylidene]amino}benzoic acid; Ln = Tb(1), Gd(2), Nd(3), Pr(4), Sm(5)) have been prepared via reactions of lanthanide nitrate salts, H₂L and Na₂SiO₃. The metal skeleton shows rarely observed lamp-shaped conformation with eight metals being connected by a μ ₄-silicate bridge. Variable-temperature, solid-state dc magnetic susceptibility studies were carried out on polycrystalline samples of 1 and 2. The data in the 2.0–300 K range reveal antiferromagnetic LnIII⋯LnIII exchange interactions in these two clusters. This work demonstrates the synthetic potential of combining Schiff-base ligands with silicate in the preparation of polymetallic lanthanide clusters.