A series of molecular fractals, specifically Sierpiński triangles, can be assembled on a Ag(111) surface from small, bent oligophenyls with a bromo group at each end. The self-assembly is driven by the formation of synergistic halogen and hydrogen bonds between the molecular building blocks, and defect-free structures with more than 100 individual components are observed.
- Jian Shang
- Yongfeng Wang
- Kai Wu