Hollow Spheres Self-Assembled by a Tetraphenylethylene Macrocycle and Their Transformation to Bird Nests under Ultrasound

A new tetraphenylethylene macrocycle easily self-assembled into both intrinsic pores and extrinsic pores in crystal and hollow spheres in precipitates. The hollow spheres could be transformed into bird nests composed of nanorods under ultrasound, which could be used to load and controllably release anticancer drugs.