Designing libraries of first generation AB3 and AB2 self-assembling dendrons via the primary structure generated from combinations of (AB)(y)-AB3 and (AB)(y)-AB2 building blocks.
Structural analysis of three libraries of up to five generations of self-assembling dendrons based on AB(3), AB(2), and combinations of AB(3) with AB(2) building blocks (Percec et al. J. Am. Chem. Soc. 2001, 123, 1302) facilitated the discovery of several nanoscale lattices previously unknown for organic compounds (3-D Pm3n cubic, 3-D P4(2)/mnm tetragonal, and a crystallographically forbidden 12-fold symmetry liquid quasicrystal) and provided fundamental correlations between the molecular structure of the dendron and the shape and the diameter of the supramolecular dendrimers which, in these experiments, were limited to less than 75 A. That study concluded that alternative design principles should be elaborated for the assembly of supramolecular dendrimers of larger dimensions. Here we report design principles, synthesis and analysis of first and higher generations AB(3) and AB(2) self-assembling dendrons, based on various primary structures, and combinations of (AB)(y)-AB(3) and (AB)(y)-AB(2) (i.e., from nondendritic AB where y = 1 to 11 and dendritic AB(3) and AB(2)) building blocks that produced the largest structural (including six new lattices) and dimensional (100 to 217 A diameter) diversity of supramolecular dendrimers.
Percec
Virgil
V
Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA. percec@sas.upenn.edu
Mitchell
Catherine M
CM
Cho
Wook-Dong
WD
Uchida
Satoshi
S
Glodde
Martin
M
Ungar
Goran
G
Zeng
Xiangbing
X
Liu
Yongsong
Y
Balagurusamy
Venkatachalapathy S K
VS
Heiney
Paul A
PA