Supramolecular encapsulation of aggregates of C60

Abstract

The 1 : 1 p-But-calix[8]arene complex of C ~O is micelle-like, with a trimeric aggregate of fullerenes surrounded by three host molecules each in the double cone conformation, a structure that can accommodate one C70 unit by isomorphous replacement of one C60.

Metal-Containing Rigid Concave Surfaces: An Entry to the Confinement of Globular Molecules

“…Even for an excess of [Ni(TMTAA)], the 1:1 complex of C 60 is formed, rapidly crystallising from solution as a result of its low solubility in toluene. This is consistent with the polarisation of the fullerene on host ± guest formation in solution and results in the aggregation of the fullerene, [6,7,10] to give a solid-state structure containing both host ± guest and fullerene ± fullerene interactions. The 2:1 complexes of o-C 2 B 10 H 12 or P 4 S 3 are favoured, even for an excess of the cage, and indeed these conditions are best for driving the precipitation of the complexes from solution, because the complexes are more soluble than [Ni(TMTAA)] itself.…”

“…There is a sixth fullerene at a distance of 12.81 , which, together with the corrugated rather than planar structure of the fullerene sheets, is a departure from the hexagonal close packing of the fullerenes. The structure embodies a balance between host ± cage interactions, utilising both concave surfaces and cage ± cage interactions, as found in cyclotriveratrylene [9,10] and calix [6]arene [4] complexes of C 60 . It is the first structurally authenticated metal ± macrocycle complex of C 60 in which the metal centre is not directly bound to the fullerene.…”

Structural Diversity of Host–Guest and Intercalation Complexesof Fullerene C60

“…The cup shape of the calixarene and possible polarization effects from the bromine substituents presumably impact on the overall structure, which consists of the stacking of the dimeric columns as represented by the top view projection with no other fullerene···fullerene close contact other than that of the dimers, Figure 4. [43] While a trimeric aggregate of C 60 molecules have been proposed for the structure of the 1:1 complex of C 60 with p-tBu-calix [8]arene, [42] its solid-state structure authentication remains elusive, and the same can be said of higher arrays. For the dimeric arrangement, there are only a couple of structures in which the fullerene molecules are ordered.…”

Self-Assembly of Grid and Helical Hydrogen-Bonded Arrays Incorporating Bowl-Shaped Receptor Sites That Bind Globular Molecules

“…This chemistry shows considerable potential in the field of separation science and indeed the selective complexation of C 60 by p-tertbutylcalix [8]arene is a simple and cost efficient means of C 60 extraction from a mixture of fullerenes. [2] The ball-and-socket nanostructures can exist as discrete monomeric species, [3] or form aggregates [4] or polymeric structures [5,6] through fullerene ± fullerene interactions.…”