Inclusion of [60]Fullerene in a Self-assembled Homooxacalix[3]arene-based Dimeric Capsule Constructed by a PdII–pyridine Interaction. The Li+-binding to the Lower Rims can Improve the Inclusion Ability

Wraparound Hosts for Fullerenes: Tailored Macrocycles and Cages

“…[54] Cage 36 was functionalized with OCH 2 CO 2 Et chains at the lower rims of homooxacalix [3]arene scaffolds, which allowed the authors to assess the effect of alkali-metal complexation in these sites. As deduced from the 1 H NMR spectrum, the addition of the small lithium cation splays 4-(4-pyridyl)phenyl moieties, resulting in the reinforcement of the multipoint interaction between fullerene and its container (log K a = 3.3 in 1,2-dichloroethane at 25 8C).…”

Homooxacalixarenes: II. Receptor properties

“…Pyridine-containing oxacalixarene 13 with ester groups on the lower rim of the molecule [17] dimerized in the presence of Pd(II) derivative 14 affording on the force of Pd(II)pyridine interaction a capsule-like molecule 15 possessing D 3h -symmetry [18,19]. This molecule proved to be capable to include into the inner cavity the C 60 -fullerene as was unambiguously supported by 1 H and 13 C NMR spectra.…”

“…The replacement of Li + by Na + cations also attached to the lower rim results in total removal of fullerene from the complex [18] (Scheme 2).…”

Wirte für Fullerene: maßgeschneiderte Makrocyclen und Käfige

“…[54] Die Käfigstruktur 36 wurde am unteren Rand des Homooxacalix [3]aren-Gerüsts [33,41] als auch zu Fehlschlägen [13,33] führen kann. Trotzdem ist man nun in der Lage, sich die neuen maßgeschneiderten Makrocyclen für diverse Anwendungen zunutze zu machen, z.…”