Abstract
Solvent effect on self‐assembly of 4,7‐dibromo‐5,6‐bis(octyloxy)benzo[c][1,2,5] thiadiazole (DBT) on a highly oriented graphite (HOPG) surface was investigated by scanning tunneling microscopy (STM) by using 1‐phenyloctane, 1‐octanoic acid, and 1‐octanol as the solvents. Two different patterns were obtained in 1‐phenyloctane and 1‐octanoic acid, suggesting that the self‐assembly of DBT was solvent dependent. At the 1‐phenyloctane/HOPG interface, a linear structure was revealed due to the intermolecular halogen bonding. When 1‐octanoic acid and 1‐octanol are used as the solvents, the coadsorption of solvent molecules resulting from the hydrogen bonding between DBT and solvent made an important contribution to the formation of a lamellar structure. The results demonstrate that solvents could affect the molecular self‐assembly according to the variational intermolecular interactions.
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