Participating Group (2020-2021)
Development of Emissive Soft Crystals through Control of Dynamic Motion of Negatively Curved π-Frameworks
Curved polycyclic aromatic hydrocarbons (PAHs) have attracted considerable attention, especially as novel π-conjugated materials. Recently we have found tetrathiacirculene octaoxides exhibit negatively curved annulated π-frameworks and a dynamic inversion of their saddle-shaped conformation. Especially, we have also found that tetrathiacirculene octaoxides 1 having peripheral aryl groups exhibited vapo- and thermochromic behaviors, through crystal-to-crystal transition. X-Ray analysis clearly suggest that this phenomenon originates from the dynamic motion of their negatively curved π-frameworks from saddle-conformation to planar conformation in the crystals. In this research subjects, we will disclose the detailed pathway on the crystal-to-crystal transition and establish the principle for the design of novel emissive soft crystals based on the curved π-conjugated frameworks.