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Chiroptical control in helical receptor-anion complexes.

Hiromitsu Maeda1, Tomohiro Shirai, Yuya Bando

  • 1College of Pharmaceutical Sciences, Ritsumeikan University , Kusatsu 525-8577, Japan, Advanced Elements Chemistry Research Team and Elements Chemistry Laboratory, RIKEN , Wako 351-0198, Japan, Faculty of Science and Technology, Seikei University , Musashino 180-8633, Japan, Graduate School of Pharmaceutical Sciences, The University of Tokyo , Tokyo 113-0033, Japan, PRESTO, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan, Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST) , Ikoma 630-0192, Japan, and National Institute for Materials Science (NIMS) , Tsukuba 305-0044, Japan.

Organic Letters
|November 20, 2013
PubMed
Summary

Chiral anions induce helical structures in π-conjugated molecular dimers. The specific helical configuration depends on the molecular structure, as confirmed by circular dichroism and luminescence spectroscopy.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Electronics
  • Chiroptical Spectroscopy

Background:

  • Anion-responsive π-conjugated systems are key for molecular recognition and sensing.
  • Helical supramolecular structures offer unique chiroptical properties.
  • Controlling molecular chirality is crucial for advanced materials.

Purpose of the Study:

  • To investigate the formation of helical structures in terphenyl-bridged dipyrrolyldiketone boron complex dimers.
  • To explore the induction of chirality by chiral amino acid anions.
  • To understand the relationship between molecular geometry and helical configuration.

Main Methods:

  • Synthesis of terphenyl-bridged dipyrrolyldiketone boron complexes.
  • Chiral anion binding studies using l-amino acid anions.
  • Characterization using circular dichroism (CD) spectroscopy.
  • Analysis of circularly polarized luminescence (CPL) spectroscopy.

Main Results:

  • Dimers self-assembled into helical structures upon binding with chiral l-amino acid anions.
  • CD and CPL spectroscopy confirmed the induction of chirality.
  • The specific terphenyl spacer geometry dictated the preferred helical configuration (handedness).

Conclusions:

  • Terphenyl-bridged dipyrrolyldiketone boron complexes can form anion-responsive helical structures.
  • Chiral amino acid anions effectively induce chirality in these systems.
  • Molecular design of the terphenyl spacer is critical for controlling supramolecular chirality.