Onion‐Type Complexation Based on Carbon Nanorings and a Buckminsterfullerene

Abstract

An Matroschka‐Puppen erinnernde Multieinschlussverbindungen wurden in unpolaren organischen Lösungsmitteln aus Kohlenstoff‐Nanoringen und einem C60‐Molekül hergestellt (siehe Bild). Eine Untersuchung dieser Strukturen zeigt, dass sich die elektronischen Eigenschaften planarer und gekrümmter konjugierter Systeme beträchtlich unterscheiden.

Sponge-like molecular cage for purification of fullerenes

“…Host platforms containing extended p-systems have been designed because of their affinity towards the sphere-like unsaturated structure of fullerenes. In this line, several covalent or supramolecular approaches pursued include: (a) macrocyclic arene-based receptors [18][19][20][21][22][23][24] , (b) macrocyclic structures containing aromatic heterocycles [25][26][27][28] , (c) p-extended TTF receptors [29][30][31][32][33] and (d) macrocyclic or jawlike structures containing porphyrin moieties 17,[34][35][36][37][38][39][40][41][42][43][44][45] . Interestingly, Fujita and co-workers reported the use of the empty channels of a metal-organic framework (MOF) for encapsulating fullerenes upon soaking MOF crystals in fullerene-containing toluene.…”

Concave Tetrathiafulvalene‐Type Donors as Supramolecular Partners for Fullerenes

“…[2] In particular, noncovalent nanostructures, such as "onions", [3] "peapods", [4] polymeric networks, [5] and dendrimers, [6] have been successfully constructed using aromatic p-p-stacking interactions between the surface of fullerenes and different kinds of receptors. [7] With regards to the electron-donor fragment, the ideal partner for fullerenes should 1) show good electrondonor properties, 2) absorb light efficiently, preferably in the visible region, and 3) self-assemble with fullerenes in a controlled fashion.…”

Cyclic [5]Paraphenyleneacetylene: Synthesis, Properties, and Formation of a Ring‐in‐Ring Complex Showing a Considerably Large Association Constant and Entropy Effect

“…Recently we reported the synthesis of cyclic [6]-to [9]paraphenyleneacetylenes ([6]-to [9]CPPA; 2-5; Figure 1). [7] These compounds have smooth belt-shaped structures, in which the p orbitals are aligned perpendicular to a rigid surface, and thus may be termed "carbon nanorings".…”