Issue 12, 2019

Ring size affects the kinetic and thermodynamic formation of [2]rotaxanes featuring an unsymmetric bis-crown ether component

Abstract

Bridging of a [2]pseudorotaxane formed from an unsymmetric mono-crown ether and an ammonium salt has provided two types of [2]rotaxanes, with the axle component positioned within a large (4L) and small (4S) ring, respectively. 1H NMR spectroscopy has revealed that 4L is the kinetically favored [2]rotaxane, whereas 4S is thermodynamically favored at low temperature.

Graphical abstract: Ring size affects the kinetic and thermodynamic formation of [2]rotaxanes featuring an unsymmetric bis-crown ether component

Supplementary files

Article information

Article type
Research Article
Submitted
06 ⵢⵓⵍ 2019
Accepted
09 ⴽⵜⵓ 2019
First published
11 ⴽⵜⵓ 2019

Mater. Chem. Front., 2019,3, 2702-2706

Ring size affects the kinetic and thermodynamic formation of [2]rotaxanes featuring an unsymmetric bis-crown ether component

M. Naito, T. Fujino, S. Tajima, S. Miyagawa, K. Yoshida, H. Inoue, H. Takagawa, T. Kawasaki and Y. Tokunaga, Mater. Chem. Front., 2019, 3, 2702 DOI: 10.1039/C9QM00441F

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