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New lanthanide-based complexes constructed from cucurbit[6]uril: Synthesis, structures and properties

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Three lanthanide-based complexes, {Gd2(H2O)10(CB[6])2}·CB[6]·6Cl·12H2O (1), {[Gd2(H2O)8CB[6]2]·(CuCl4)·4Cl·46H2O}n (2), and {Dy2(NO3)2(H2O)10(CB[6])}·4NO3·14H2O (3) (CB[6] = cucurbit[6]uril), were prepared with cucurbit[6]uril (CB[6]). These complexes were characterized by single-crystal X-ray diffraction, elemental analysis, FT-IR spectroscopy, UV–Vis spectroscopy, thermogravimetric analysis and magnetization measurements. Crystallographic results showed that 1 and 3 are dinuclear and crystallize in the triclinic space group Pī, whereas 2 is a 1-D zigzag supramolecular chain that crystallizes in the monoclinic system in C2/C. The results indicated that temperature has a big effect on the supramolecular assemblies and a different structure inducer also leads to the formation of different coordination polymers. Frequency dependence in the ac susceptibility signals was observed in 3.
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Keywords: Cucurbit[6]uril; Ln-based complex; X-ray crystallography

Document Type: Research Article

Affiliations: The Key Laboratory of Special Functional Aggregated Materials, Shandong University, Ministry of Education, Jinan, PR China

Publication date: May 3, 2018

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