Regulation of Two-Component Nanostructures at the Liquid-Solid Interface: Role of Pyridine Derivatives and Coronene.

We investigate the self-assembly behaviors of the tetracarboxylic acid molecule (H₄IMD), which contains an imidazole moiety, and explore the regulation by pyridine derivatives with varying backbones and the guest molecule coronene (COR). Two H₄IMD molecules are linked through N-H···O hydrogen bonds to form a dimer, which spontaneously self-assembles into a grid structure via O-H···O hydrogen bonds. The addition of linear pyridine derivatives (BP and Bispy) can break some of the O-H···O hydrogen bonds, allowing these pyridine molecules to insert between the dimer columns. In contrast, the tripyridine derivative (TPYB) disrupts the original dimer structures, resulting in a completely altered nanostructure. Moreover, the H₄IMD self-assembled structure can be regulated into a rhombus network by the coadsorption of COR molecules. Combining scanning tunneling microscopy and density functional theory calculations, this study elucidates the diverse structural variations and the underlying mechanisms, which provide new insights into molecular coassembly.