Competition and coadsorption of di-acids and carboxylic acid solvents on HOPG

Article Abstract:

The scanning tunneling microscopy (STM) was used to study the self-assemblies of di-acids HOOC-[(C[H.sub.2]).sub.n]-COOH (n = 20, 18, 16, 14, 12, 10) in three solvents hexanoic acid, octanoic acid, and decanoic acid on highly oriented pyrolytic graphite (HOPG). In each solvent, the trend of coadsorption between solvent molecules and di-acid molecules decreases with decreasing chain-length of di-acid molecules which suggest that coadsorption of solvent molecules with di-acid solute molecule is mainly dependent on the relative hydrogen-bond densities in the formed monolayer.

Observations, Hydrogen bonding, Hydrogen bonds, Carboxylic acids, Structure

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Chain-length effects on molecular conformation in and chirality of self-assembled monolayers of alkoxylated benzo[c]cinnoline derivatives on highly oriented pyrolytic graphite

Article Abstract:

Self-assembled structures of alkoxylated benzo[c]cinnoline derivatives prepared on highly oriented pyrolytic graphite at room temperature from their solution in solvents such as 1-phenyloctane, toluene, and 1-octanol are studied by scanning tunneling microscopy. The alkoxy chain length markedly affects the molecular confrontations in 2-dimensional assemblies of these derivatives.

Thermal properties

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