Kinetically-Locked Metallomacrocycle for Host-Guest Chemistry with Bulky Anions |
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Authors: | Dr Shin-ichiro Kawano Takahiro Harada Ako Sasaki Prof?Dr Kentaro Tanaka |
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Institution: | Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602 Japan |
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Abstract: | As a robust and large molecular receptor, a kinetically-locked trinuclear Co(III) macrocycle was synthesized with bis(β-diketone) ligands having large π-panels of 9,10-diphenylanthracene moieties via a combination of Co(II)-assisted self-assembly and subsequent oxidation of the metal centers. The X-ray structure revealed that the macrocycle had a discrete nanocavity of more than 300 Å3, which was surrounded by three anthracenyl panels in the middle. As the macrocycle has three cationic centres on each metal ion and a large cavity, it acts as a guest receptor for sodium tetraphenylborate. The binding constant was estimated to be 4.0×10?2 M?1 from 1H NMR titration experiments, whereas no interaction was observed between the macrocycle and potassium 1-adamantanecarboxylate. |
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Keywords: | Anion recognition Coordination chemistry Host-Guest systems Macrocycles |
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