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Published October 19, 2001 | Supplemental Material
Journal Article Open

Supramolecular Daisy Chains

Abstract

Two series of self-complementary daisy chain monomers, in which a secondary ammonium ion-containing arm is grafted onto a macrocycle with either a [24]- or [25]crown-8 constitution, have been synthesized. In the solid- and 'gas'-phases, the parent [24]crown-8-based monomer forms dimeric superstructures, as revealed by X-ray crystallography and mass spectrometry, respectively. Elucidation of the complicated solution-phase behavior of this compound was facilitated by the synthesis and study of both deuterated, and fluorinated, analogues. These investigations revealed that the cyclic dimeric superstructure also dominates in solution, except when extremes of either concentration (low), temperature (high), or solvent polarity (highly polar, e.g., dimethyl sulfoxide) are employed. Whereas, upon aggregation, the [24]crown-8-based daisy chain monomers have the capacity to form stereoisomeric superstructures further complicating the study of this series of compounds. The assembly of [25]crown-8-based monomers gives only achiral superstructures. The weaker association exhibited between secondary dialkylammonium ions and crown ethers with a [25]crown-8 constitution, however, resulted in limited oligomerization only dimeric and trimeric superstructures were formed at experimentally attainable concentrations of [25]crown-8-based daisy chain monomers.

Additional Information

© 2001 American Chemical Society. Received 19 April 2001. Published online 26 September 2001. Published in print 1 October 2001. This research was supported by the National Science Foundation. Anthony Pease is thanked for producing the ray-traced pictures contained within this paper.

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August 19, 2023
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