Coadsorbed NTCDI-melamine mixed phases on Ag-Si(111)

The coadsorption of naphthalene tetracarboxylic diimide and melamine (1,3,5-triazine-2,4,6-triamine) on the Ag-Si(111)root 3 X root 3R30 degrees surface has been investigated using scanning tunneling microscopy under ultrahigh vacuum conditions. Three hydrogen bonding arrangements between the constituent molecules are possible, which result in the formation of a variety of supramolecular structures. The primary unit for the formation of larger complex structures such as a triangular and a row arrangement was identified. A comparison with similar molecules which have been studied previously indicates that the molecule-substrate interaction plays an important role in the formation of the observed structures.