In solutions, the bending behavior of molecules predominantly leads to folding along the axis of symmetry, comparable to how a butterfly folds its wings along its body during forward flight. Zang and his team designed a system consisting of OAP, ONP ligands , and Cu(I) as the metal source (Figure ). Under dispersed conditions, the pyrazine structure with 8π electrons once again forms the RIV skeleton. Nonetheless, unlike the photoexcited aromaticity in planarized conversion molecules serving as the driving force, the vibration of the pyrazine part is restricted by guest molecules incorporated into the cavity, leading to light emission. Authors also studied a unique host-guest supramolecular system where lower temperature and higher viscosity lead to enhanced emission. What's more, the fluorescence spectra at different viscosities were measured, they found the fluorescence intensity of the supramolecular complex gradually enhances with increasing viscosity. All of these data further confirm the AIE properties of the coordination compounds.