Charge-injection-induced structural transition of C₆₀. (a) Crystal structures of Mg₄C₆₀ and Mg₂C₆₀ polymers determined by single-crystal XRD and a schematic of organic cation slicing exfoliation. Adapted with permission from ref. [40]. Copyright 2022 Springer Nature. (b) Charge-injection-induced structural transformation of C₆₀ molecular crystal to 1D orthorhombic polymer and 3D fcc LOPC crystal, and the corresponding XRD and high-resolution TEM images. Adapted with permission from ref. [43]. Copyright 2023 Springer Nature. (c) 2D potential energy surface mapping and typical structures during structural evolution starting from C₆₀ molecular crystal. Adapted with permission from ref. [233]. Copyright 2022 John Wiley and Sons.