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Related Experiment Videos

Stereochemistry in self-assembled encapsulation complexes: constellational isomerism.

Masamichi Yamanaka1, Alexander Shivanyuk, Julius Rebek

  • 1The Skaggs Institute for Chemical Biology and Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 26, 2004
PubMed
Summary

A new type of stereochemistry, constellational isomerism, was discovered. Different arrangements of small molecules within a host molecule create distinct isomers, with potential applications in data storage.

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Area of Science:

  • Supramolecular Chemistry
  • Stereochemistry
  • Chemical Physics

Background:

  • Self-assembled molecular capsules can encapsulate small molecules.
  • Guest molecule mobility within hosts is influenced by host-guest interactions and dimensions.
  • Nuclear Magnetic Resonance (NMR) spectroscopy is a key tool for characterizing molecular arrangements.

Purpose of the Study:

  • To describe a novel form of stereoisomerism termed constellational isomerism.
  • To investigate the arrangements of small-molecule guests within a self-assembled cylindrical host.
  • To explore the potential of these arrangements for information storage.

Main Methods:

  • Synthesis of a self-assembled cylindrical host.
  • Encapsulation of small molecules (chloroform, 1,2-dichloroethane, isopropyl chloride) within the host.

Related Experiment Videos

  • Analysis of guest molecule arrangements using NMR spectroscopy at variable temperatures.
  • Determination of isomer distribution and stability as a function of guest concentration and properties.

    • Main Results:

    • A new type of stereoisomerism, constellational isomerism, arising from guest arrangements within a host was identified.
    • Distinct NMR signals were observed for guests at different positions within the host due to hindered mobility.
    • Up to four distinct constellational isomers were observed when two different guests were co-encapsulated.
    • Isomer distribution was dependent on guest concentrations, and isomer stability correlated with guest polarity and host interactions.

    Conclusions:

    • Constellational isomerism represents a novel way to encode information at the molecular level.
    • The observed isomerism is governed by guest properties and host-guest interactions.
    • These molecular arrangements offer potential for developing new data storage technologies.