Volume 129, Issue 24 pp. 6973-6977
Zuschrift

Temperature-Driven Planar Chirality Switching of a Pillar[5]arene-Based Molecular Universal Joint

Jiabin Yao

Jiabin Yao

Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

These authors contributed equally to this work.

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Dr. Wanhua Wu

Dr. Wanhua Wu

Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

These authors contributed equally to this work.

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Dr. Wenting Liang

Dr. Wenting Liang

Institute of Environmental Sciences, Shanxi University, China

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Prof. Yujun Feng

Prof. Yujun Feng

State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, China

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Dr. Dayang Zhou

Dr. Dayang Zhou

Comprehensive Analysis Center, ISIR, Osaka University, Japan

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Prof. Jason J. Chruma

Prof. Jason J. Chruma

Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

Sino-British Materials Research Institute, College of Physical Sciences & Technology, Sichuan University, Chengdu, 610064 China

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Prof. Gaku Fukuhara

Prof. Gaku Fukuhara

Department of Chemistry, Tokyo Institute of Technology, Japan

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Prof. Tadashi Mori

Prof. Tadashi Mori

Department of Applied Chemistry, Osaka University, Japan

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Prof. Yoshihisa Inoue

Prof. Yoshihisa Inoue

Department of Applied Chemistry, Osaka University, Japan

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Prof. Cheng Yang

Corresponding Author

Prof. Cheng Yang

Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

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First published: 11 May 2017
Citations: 41

Abstract

The study of an enantiopure bicyclic pillar[5]arene-based molecular universal joint (MUJ) by single-crystal X-ray diffraction allowed for the first time the unequivocal assignment of the absolute configuration of a planar chiral pillar[5]arene by circular dichroism spectroscopy. Crucially, the absolute configuration of the MUJ was switched reversibly by temperature, with an accompanying sign inversion of the anisotropy factor that varied by as much as 0.03, which is the largest value ever reported. Mechanistically, the reversible chirality switching of the MUJ is driven by the threading/dethreading motion of the fused ring and hence is dependent on both the size and nature of the ring and the solvent employed, reflecting the critical balance between the self-complexation of the ring by pillar[5]arene, the solvation to the excluded ring, and the inclusion of solvent molecules in the cavity.

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