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Self‐Assembling Dendronized Dendrimers
Author(s) -
Percec Virgil,
Imam Mohammad R.,
Peterca Mihai,
Cho WookDong,
Heiney Paul A.
Publication year - 2009
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/ijc.49.1.55
Subject(s) - dendrimer , chemistry , supramolecular chemistry , self assembly , crystallography , amine gas treating , tetragonal crystal system , reagent , hexagonal crystal system , nanotechnology , polymer chemistry , organic chemistry , crystal structure , materials science
The amine groups from the periphery of poly(propylenimine) dendrimers [DAB‐(NH 2 ) n ] (n = 4 and 8) were reacted with the carboxylic groups of five different first and second generation self‐assembling dendrons. The amidation was mediated by the peptide bond forming reagent 2‐chloro‐4,6‐dimethoxy‐1,3,5‐triazine (CDMT)/ N ‐methylmorpholine (NMM). All the resulting dendronized dendrimers self‐assemble into helical pyramidal columns that self‐organize into columnar hexagonal and columnar rectangular 2D lattices and in supramolecular spheres that self‐organize into 3D Pm 3 n and P4 2 /mnm tetragonal lattices. The structural and retrostructural analysis of the supramolecular dendrimers by X‐ray diffraction experiments demonstrated that supramolecular dendritic spheres are assembled from various spherical fragments, including conical and half‐sphere in which the DAB dendrimer is confined to their apex. Dendritic‐crown is the most frequently encountered conformation of the dendronized dendrimers that is responsible for the assembly of helical pyramidal columns.