Issue 5, 2014

Intramolecular C–H⋯F hydrogen bonding-induced 1,2,3-triazole-based foldamers

Abstract

This paper reports the first series of artificial secondary structures that are induced by intermolecular C–H⋯F hydrogen bonding. Oligomers that contain two, four, six, and eight 1,2,3-triazole units have been designed and prepared by connecting the neighbouring 1,2,3-triazole units with 4,6-difluoro-m-phenylene linker(s). Two triphenylmethyl groups are appended at the ends of the backbones to suppress the stacking of the backbones and provide solubility. X-Ray analysis and 1H NMR and two-dimensional 1H–19F heteronuclear Overhauser enhancement spectroscopic (HOESY) experiments support that the 1,2,3-triazole backbones adopt folded or helical conformations due to the formation of continuous three-centred C–H⋯F hydrogen bonding. Quantum chemical calculations reveal that the longest 8-mer foldamer can form a one-turn helical cavity with a diameter of ca. 1.7 nm. Halide anion competition experiments show that the intramolecular C–H⋯F hydrogen bonding is more stable than the well-established intermolecular C–H⋯X (X = Cl and I) hydrogen bonding.

Graphical abstract: Intramolecular C–H⋯F hydrogen bonding-induced 1,2,3-triazole-based foldamers

Supplementary files

Article information

Article type
Research Article
Submitted
18 Feb 2014
Accepted
09 Apr 2014
First published
10 Apr 2014

Org. Chem. Front., 2014,1, 494-500

Author version available

Intramolecular C–H⋯F hydrogen bonding-induced 1,2,3-triazole-based foldamers

Y. Liu, L. Zhang, X. Xu, Z. Li, D. Zhang, X. Zhao and Z. Li, Org. Chem. Front., 2014, 1, 494 DOI: 10.1039/C4QO00047A

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