Dendrons conical

Size and shape Certain steric effects can be achieved using characteristically wedge-shaped dendrons. Thus, self-assembling dendrons have been connected to supramolecular aggregates with defined dimeric or hexameric structures. Such aggregates can form columnar superstructures which reveal liquid-crystalline properties. Spherical superstructures arise from the self-assembly process when conical dendrons are used14 14,161 Similar... 

Figure 5.4 Self-assembly of wedge-shaped molecules (modified from Zeng et al 2004). (a) Dendrons with fewer tethered chains adopt a flat slice-like shape (X is a weakly binding group), (b) The slices stack up and form cylindrical columns, which assemble on a two-dimensional hexagonal columnar (Col ) lattice (c). (d) Dendrons with more end-chains assume a conical shape, (e) The cones assemble into spheres, which pack on three different three-dimensional lattices (f) with different symmetries.

Scheme 11 Formation of hexagonally packed conical and cubic-packed sphere-type structures from flat-tapered and conical dendrons, respectively. (Adapted from Ref. 55. American Chemical Society, 1997.)...

In several seminal papers, Percec et al. [157,159] reported the demonstration of abiotic quasi-equivalency by controlling the degree of polymerization of various polymerizable dendrons described earlier. For example, 12 second-generation conical monodendrons (DP = 12) produced a spherical dendrimer... 

Figure 27 Quasi-equivalency of natural and synthetic supramolecular systems with cylindrical and spherical shapes (a) tobacco mosaic virus, (b) icosahedral virus synthetic analogue of (a) and (b) have been self-assembled from (c) tapered and (d) conical mono-dendrons. (Courtesy of Nature 1998, 391, 8, 161. Copyright 1998 Macmillan Magazines Limited.)...

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