3 years ago

Observation of Supramolecular Chirality in a Hierarchically Self-Assembled Mixed-Stack Charge-Transfer Complex

Observation of Supramolecular Chirality in a Hierarchically Self-Assembled Mixed-Stack Charge-Transfer Complex
Karical Raman Gopidas, Sumesh Babu Krishnan
Supramolecular chirality was observed in a charge-transfer (CT) complex formed by self-assembly of β-cyclodextrin-linked pyrene and adamantane-linked pyromellitic diimide in water. In the complex, the pyrene–pyromellitic diimide CT interaction is reinforced several-fold by the strong β-cyclodextrin–adamantane inclusion binding interaction, as confirmed by 1H NMR, absorption, fluorescence and isothermal titration calorimetry studies. The CT complex exhibited high stability, as inferred from the temperature-dependent absorption and NMR studies. The CT absorption band exhibited a positive Cotton effect indicative of supramolecular chirality for the complex. Twisted fibres were observed in TEM, AFM, and SEM experiments. A mechanism involving synergistic binding interactions leading to 2D sheets, followed by twisting of the sheet, is proposed for the formation of twisted fibres. This system offers a chance to investigate a combination of supramolecular CT and supramolecular chirality and explore their synergistic effects. Do the twist: A chiral supramolecular charge-transfer complex is formed by the synergistic effect of charge-transfer interaction and inclusion binding between a pyrene-appended β-cyclodextrin donor and an adamantane-linked pyromellitic diimide acceptor in aqueous solution, and formation of twisted fibres was observed by electron microscopy and AFM (see scheme).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701123

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.