New lanthanide-based complexes constructed from cucurbit[6]uril: Synthesis, structures and properties
Abstract
<p>Three lanthanide-based complexes, {Gd<sub>2</sub>(H<sub>2</sub>O)<sub>10</sub>(CB[6])<sub>2</sub>}·CB[6]·6Cl·12H<sub>2</sub>O (<b>1</b>), {[Gd<sub>2</sub>(H<sub>2</sub>O)<sub>8</sub>CB[6]<sub>2</sub>]·(CuCl<sub>4</sub>)·4Cl·46H<sub>2</sub>O}<sub>n</sub> (<b>2</b>), and {Dy<sub>2</sub>(NO<sub>3</sub>)<sub>2</sub>(H<sub>2</sub>O)<sub>10</sub>(CB[6])}·4NO<sub>3</sub>·14H<sub>2</sub>O (<b>3</b>) (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 <b>1</b> and <b>3</b> are dinuclear and crystallize in the triclinic space group <i>P</i>ī, whereas <b>2</b> is a 1-D zigzag supramolecular chain that crystallizes in the monoclinic system in <i>C</i>2/<i>c</i>. 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 <b>3</b>.</pSimilar works
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