Honeycomb networks and chiral superstructures formed by cyanuric acid and melamine on Au(111)

Two distinct bimolecular cyanuric acid-melamine intermixed structures, a honeycomb network and a larger superstructure, have been observed on Au(111) using a scanning tunneling microscope under ultrahigh vacuum conditions. The superstructure is formed as a regular array of chiral hexagonal rings of melamine, linked by single molecules of cyanuric acid. These bimolecular networks show both key similarities and differences to related networks studied previously on surfaces and in bulk phases. We also compare our results with networks formed by related molecules on Au(111) and Ag-terminated silicon.