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Synthesis of Supramolecular Polymers by Ionic Self‐Assembly of Oppositely Charged Dyes
Author(s) -
Guan Ying,
Yu ShuHong,
Antonietti Markus,
Böttcher Christoph,
Faul Charl F. J.
Publication year - 2005
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200400778
Subject(s) - stacking , supramolecular chemistry , transmission electron microscopy , polymer , ionic bonding , supramolecular polymers , side chain , crystallography , materials science , phthalocyanine , fiber , chemistry , polymer chemistry , nanotechnology , composite material , crystal structure , ion , organic chemistry
A new type of supramolecular polymer was prepared by ionic self‐assembly (ISA) from two oppositely charged dyes; a perylenediimide and a copper–phthalocyanine derivative. Coulomb coupling stabilizes the whole structure, and a combination of charge‐transfer interactions and discotic stacking facilitates the exclusive formation of one‐dimensional polymeric chains. The supramolecular dye‐polymers have a large association constant (2.4×10 7 L mol −1 ), high molecular weight, and high mechanical stability. The use of cryo‐transmission electron microscopy (cryo‐TEM) confirmed the existence of extended fibers of width 2.4 nm. Further image analysis revealed slight undulation and faint segmentation of the fibers, and density maxima were observed at a regular interval of 3.6 nm along the fiber axis. The fiber‐like structure (and aggregate of fibers) is also found in the solid state, as shown by the results of mineralization contrasting experiments, atomic force microscopy (AFM), and X‐ray analyses. A structural model is proposed, in which the structural subunits, arranged in a side‐by‐side conformation, form a stacked structure.