Unusual Shapes of C60 Crystals Formed at Liquid–Liquid Interfaces

We have found some unusually shaped C60 crystals which formed at liquid–liquid interfaces when m-xylene and ethanol were used as good and poor solvents, respectively. The crystals coexisted with large amounts of needle-like or whisker-like crystals which likely form at the initial stage of mixing the two solvents, probably indicating that this system follows Ostwald rule of stages like well-studied isoxazolone dye which has two polymorphs, i.e., the least stable needle-like one with a small size and the most stable rhombic crystal with a large size.