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Chiral molecular nanosilicas.

Zhaohui Zong1, Aiyou Hao1, Pengyao Xing1,2

  • 1Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 People's Republic of China xingpengyao@sdu.edu.cn.

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|April 20, 2022
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This summary is machine-generated.

Researchers developed a molecular folding strategy to create chiral nanosilicas using polyhedral oligosiloxane (POSS) molecules. This method enables precise chirality transfer for potential chiroptical applications.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Molecular nanoparticles like polyhedral oligosiloxane (POSS) offer atomic precision but constructing intrinsic chirality in discrete molecules is challenging.
  • Transferring supramolecular chirality to nanoparticles often relies on external chiral matrices or self-assembly.
  • Developing methods for creating inherently chiral nanoparticles with atomic precision is a significant goal in nanoscience.

Purpose of the Study:

  • To present a novel molecular folding strategy for constructing giant polyhedral oligosiloxane (POSS) molecules with inherent chirality.
  • To demonstrate the transfer of chirality from amino acids to POSS nanoparticles through a folding mechanism.
  • To explore the control over chiral orientation and chiroptical properties of these nanosilicas.

Main Methods:

  • Conjugation of ferrocenyl diamino acids with two or four POSS segments.
  • Utilizing hydrogen bonding-driven folding of diamino acid arms into parallel β-sheets.
  • Characterization using single crystal X-ray structures, density functional theory (DFT) calculations, circular dichroism (CD), and vibrational circular dichroism (VCD) spectroscopy.
  • Employing a kinetic nanoprecipitation protocol for 1D aggregation and helix formation.

Main Results:

  • Successful construction of giant POSS molecules with inherent chirality via a folding strategy.
  • Demonstrated chirality transfer from amino acids to ferrocene and POSS moieties, independent of flexible spacers.
  • Verification of preferential formation of a single enantiomer of chiral molecular nanosilicas using spectroscopic and crystallographic methods.
  • Observed dependence of chiral orientation and chiroptical properties on α-amino acid substituents.
  • Achieved 1D aggregation into helices, transferring molecular chirality to the micrometer scale.

Conclusions:

  • The molecular folding strategy provides a new route to discrete chiral molecular nanosilicas.
  • Chirality transfer is effectively achieved from amino acids to POSS nanoparticles through controlled folding.
  • The study offers a method to tune the chiroptical properties of nanosilicas by modifying amino acid substituents.
  • This work opens avenues for developing novel chiral nanoparticles for advanced chiroptical applications.