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Benzo-cis-cyclohexano-14-crown-4 and its lithium thiocyanate complex

Bryan1, Sachleben

  • 1Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6119, USA. bryanjc@ornl.gov.

Acta Crystallographica. Section C, Crystal Structure Communications
|September 15, 2000
PubMed
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This study presents the structures of a novel benzo- and cyclohexano-substituted 14-crown-4 ether and its lithium complex. The crown ether is not preorganized for binding, leading to a less stable lithium complex with longer Li-O bonds.

Area of Science:

  • Supramolecular Chemistry
  • Organic Chemistry
  • Crystallography

Background:

  • Crown ethers are cyclic polyethers known for their ability to bind metal cations.
  • Substituents on crown ethers can significantly influence their binding properties and conformational preferences.
  • Understanding the structure-activity relationship is crucial for designing selective ionophores.

Purpose of the Study:

  • To elucidate the crystal structures of a novel benzo- and cyclohexano-substituted 14-crown-4 ether and its lithium thiocyanate complex.
  • To investigate the conformational characteristics of the free crown ether and its complexed form.
  • To analyze the cation binding behavior and its impact on the crown ether conformation.

Main Methods:

  • Single-crystal X-ray diffraction analysis was employed to determine the molecular structures.

Related Experiment Videos

  • The study involved the synthesis and characterization of the target crown ether and its lithium complex.
  • Structural data were analyzed to understand bond lengths, bond angles, and overall molecular geometry.

    • Main Results:

    • The crystal structure of the free 14-crown-4 ether (I) revealed a non-preorganized conformation, with donor dipoles oriented away from each other.
    • The lithium complex (II) contains two formula units in the asymmetric unit.
    • The binding conformation in the Li(+)-crown complex shows incomplete dipole reorientation, resulting in elongated Li-O bond lengths (2.068 and 2.073 Å).

    Conclusions:

    • The investigated benzo- and cyclohexano-substituted 14-crown-4 ether is not conformationally preorganized for efficient cation binding.
    • The lithium ion binding induces a conformation that does not fully optimize dipole alignment, leading to weaker Li-O interactions.
    • These findings highlight the influence of substituents and conformational flexibility on the cation binding efficacy of crown ethers.