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- Title
Bis(triarylmethylium)‐type Macrocyclic Dications: Mechanochromic Emission Extending to the Red Region.
- Authors
Ishigaki, Yusuke; Tachibana, Takuya; Sugawara, Kazuma; Kikuchi, Moto; Suzuki, Takanori
- Abstract
Macrocyclic dications 22+ composed of two triarylmethylium units were designed and synthesized. In contrast to the reference monocations 1+, macrocyclic dications 22+ exhibited mechanochromic emission extending to the red region (−900 nm), since the luminescence color in a solid state can reversibly change due to their constrained structures granted by alkylene linkers and the choice of a proper counterion. X‐ray diffraction and spectroscopic analyses revealed that such mechanochromic behavior was induced by the crystal‐to‐amorphous transition. A change in the intermolecular interaction of macrocyclic dications 22+ would be the key to realizing a change in the emission pattern, since the color of the molecules did not change by applying mechanical stimuli. These findings may suggest a design strategy for creating a variety of stimuli‐responsive materials, especially for carbocation‐based fluorescent materials.
- Subjects
INTERMOLECULAR interactions; X-ray diffraction; ELECTROCHROMIC effect; LUMINESCENCE
- Publication
ChemPlusChem, 2023, Vol 88, Issue 3, p1
- ISSN
2192-6506
- Publication type
Article
- DOI
10.1002/cplu.202300110