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Distinct Helical Molecular Orbitals through Conformational Lock*.

Ani Ozcelik1, Daniel Aranda2,3, Sara Gil-Guerrero4

  • 1Departamento de Química Orgánica, Universidad de Vigo, Campus Universitario, 36310, Vigo, Spain.

Chemistry (Weinheim an Der Bergstrasse, Germany)
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PubMed
Summary

Researchers created stable cyclic molecules with distinct helical molecular orbitals (Hel-MOs) by controlling torsion angles in butadiyne fragments. This advances the development of real systems with tunable helical properties.

Keywords:
alkyneschiropticshelical molecular orbitalsspirobifluorenesstructure elucidation

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Area of Science:

  • Organic Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Theoretical studies proposed helical molecular orbitals (Hel-MOs) in cumulenes and oligoynes.
  • Achieving experimentally feasible systems with distinct Hel-MOs has been challenging.

Purpose of the Study:

  • To demonstrate the introduction of a significant energy difference between opposite helical orbitals.
  • To synthesize stable, isolable systems exhibiting distinct Hel-MOs.

Main Methods:

  • Designed and synthesized cyclic architectures by combining acetylenes with chiral spirobifluorenes.
  • Fixed the torsion angle between terminal groups in butadiyne fragments to control conformation.
  • Characterized the synthesized compounds to confirm their structure and properties.

Main Results:

  • Successfully introduced a remarkable energy difference between helical orbitals of opposite twist.
  • Synthesized highly stable cyclic molecules with distinct Hel-MOs.
  • Enabled isolation and full characterization of these novel systems.

Conclusions:

  • The developed cyclic architectures provide a viable strategy for creating systems with tunable helical molecular orbitals.
  • These findings represent a significant advancement towards the realization of practical Hel-MO systems.
  • The approach allows for control over the energy difference between opposite helical orbitals.