A helical peptide receptor for [60]fullerene

Area of Science:

• Supramolecular Chemistry
• Peptide Chemistry
• Organic Synthesis

Background:

• Peptide self-assembly into defined helical structures is crucial for molecular recognition.
• Designing peptide scaffolds capable of hosting guest molecules is a key challenge in supramolecular chemistry.

Purpose of the Study:

• To synthesize and characterize novel terminally blocked nonapeptides.
• To investigate the conformational behavior of these peptides in solution and solid states.
• To explore the potential of these peptides as templates for fullerene encapsulation.

Main Methods:

• Solution-phase peptide synthesis and characterization.
• Fourier-transform infrared (FT-IR) spectroscopy.
• Two-dimensional nuclear magnetic resonance (2D NMR) spectroscopy.
• X-ray diffraction analysis.
• Photophysical analysis.
• Mass spectrometry.

Main Results:

• Successful synthesis and full characterization of two terminally blocked nonapeptides.
• FT-IR and 2D NMR confirmed a 3(10)-helical conformation in solution.
• X-ray diffraction revealed a right-handed 3(10)-helical structure in the crystal state.
• The nonapeptide template demonstrated the ability to host a [60]fullerene molecule.
• Gas-phase mass spectrometry provided further evidence for the host-guest complex.

Conclusions:

• The synthesized nonapeptides adopt stable 3(10)-helical structures.
• The peptide's helical cavity, lined with ferrocenoyloxybenzyl moieties, effectively encapsulates fullerene.
• These findings highlight the potential of rationally designed peptides as templates for creating supramolecular host-guest systems.