Abstract
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.
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The authors appreciate the financial support from Natural Science Foundation of China (21272167), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institution.
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She, SX., Chen, Y., Gao, D. et al. Lamp-Shaped Octametallic Lanthanide [Ln8SiO4] Clusters Based on a μ 4-Silicate-Bridge Core. J Clust Sci 27, 691–701 (2016). https://doi.org/10.1007/s10876-016-0974-2
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DOI: https://doi.org/10.1007/s10876-016-0974-2