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Synthesis of Supramolecular Polymers by Ionic Self-Assembly of Oppositely Charged Dyes

✍ Scribed by Ying Guan; Shu-Hong Yu; Markus Antonietti; Christoph Böttcher; Charl F. J. Faul

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
369 KB
Volume
11
Category
Article
ISSN
0947-6539

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✦ Synopsis

Abstract

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.

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