Stress‐Induced Inversion of Linear Dichroism by 4,4′‐Bipyridine Rotation in a Superelastic Organic Single Crystal

• DOI: 10.1002/anie.202217977
• Publication Date: 2023-01-17T11:00:31Z
• Authors: Yu‐Xia Li; Zhi‐Kun Liu; Jie Cao; Jun Tao; Zi‐Shuo Yao
• Keywords: Linear dichroism; Trimer; Crystal (programming language)

The molecular crystals that manifest unusual mechanical properties have attracted growing attention. Herein, we prepared an organic single crystal shows bidirectional superelastic transformation in response to shear stress. Single-crystal X-ray diffractions revealed this crystal-twinning related shape change is owed a stress-controlled 90° rotation of 4,4'-bipyridine around the hydrogen bonds chiral trimer. As consequence shift aromatic plane, interconversion crystallographic a-, b-axes (a→b' and b→a') was detected. rotations changed anisotropic absorption linearly polarized light. Therefore, stress-induced inversion linear dichroism spectra demonstrated for first time. This study reveals superior flexibilities can be realized by harnessing may find applications optical switching communications.