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• W2320098077 abstract "First insights into the coordination properties and host–guest behavior of a “two story” calix[6]aza-cryptand (1) are described. The ligand is constituted of a triazacyclononane (TACN) cap and three pyridine (PY) spacers connected to the calix[6]arene small rim. The resulting N6 donor site coordinates PbII ions to give complexes that are highly stable. X-ray diffraction structures reveal a hemidirected environment for PbII with strong coordination to the TACN cap and weaker bonds with the three PY residues. A guest molecule, either water or EtOH, sitting in the calixarene macrocycle and hydrogen-bonded to the phenoxyl units at the level of the small rim further stabilizes the complexes through electrostatic interactions with the metal center and the calixarene core. In-depth 1H NMR studies confirm the host–guest behavior of the complexes in solution, with evidence of embedment of neutral guest molecules such as EtOH, BuOH, and N-Me-formamide. Hence, in spite of the presence of a N6 donor, the calixarene macrocycle can be open to guest interaction, giving rise to seven-coordinate dicationic complexes. Noteworthy also is the flexibility of the macrocycle that allows PbII to adopt its preferred hemidirected environment in spite of the three covalent links connecting the calixarene core to the three PY groups. The flexibility of the system is further illustrated by the possible coordination of an exogenous anionic ligand in the exo position. Hence, compared to the previously described “one story” calix[6]aza-cryptands, ligand 1 displays several similar but also new features that are discussed." @default.
• W2320098077 created "2016-06-24" @default.
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• W2320098077 date "2013-11-20" @default.
• W2320098077 modified "2023-10-18" @default.
• W2320098077 title "Coordination of Lead(II) in the Supramolecular Environment Provided by a “Two-Story” Calix[6]arene-based N₆ Ligand" @default.
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• W2320098077 doi "https://doi.org/10.1021/ic4018486" @default.
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• W2320098077 hasPublicationYear "2013" @default.
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