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Related Experiment Video

Updated: Jul 9, 2026

Determination of the Gas-phase Acidities of Oligopeptides

Determination of the Gas-phase Acidities of Oligopeptides

Published on: June 24, 2013

Aromatic delta-peptides.

Hua Jiang¹, Jean-Michel Léger, Ivan Huc

¹Institut Européen de Chimie et Biologie, 16 av. Pey Berland, 33607 Pessac Cedex, France.

Journal of the American Chemical Society

|March 20, 2003

Summary

This summary is machine-generated.

Aromatic oligoamides form highly stable helical structures with unprecedented curvature. These novel helical conformations were confirmed using advanced spectroscopic and crystallographic techniques.

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Area of Science:

Organic Chemistry
Supramolecular Chemistry
Materials Science

Background:

Aromatic oligoamides are known for their structural versatility.
Achieving high helical curvature in synthetic molecules is a significant challenge.

Purpose of the Study:

To synthesize and characterize novel oligoamides based on 8-amino-2-carboxy-quinoline.
To investigate the conformational stability and helical properties of these new compounds.

Main Methods:

1H Nuclear Magnetic Resonance (NMR) spectroscopy for solution-state analysis.
Single-crystal X-ray diffraction for solid-state structural determination.
Synthesis of monomers from 2-nitroaniline and dimethyl acetylenedicarboxylate.

Main Results:

Oligoamides of 8-amino-2-carboxy-quinoline adopt a highly stable helical conformation.
The observed helical structure features 2.5 units per turn, representing the highest curvature reported for aromatic oligoamides.
Monomers with alkoxy substituents at position 4 are readily synthesized.

Conclusions:

The 8-amino-2-carboxy-quinoline scaffold enables the formation of exceptionally curved and stable helical structures.
This work expands the scope of achievable helical architectures in synthetic oligoamides.
The synthetic accessibility of the monomers facilitates further exploration of these materials.