Scanning tunneling microscopy (STM) was used to study physisorbed monolayers of 5-octadecyloxyisophthalic acid (C 18 ISA) and 5-[ω-(4‘-dodecyloxy-4-azobenzeneoxy)dodecyloxy]isophthalic acid (C 12 (AZO)C 12 ISA) at a liquid/graphite interface. The acquired STM images exhibit the molecular packing of the monolayers with submolecular resolution. Monolayers formed by codeposition of solvent molecules and C 18 ISA or C 12 (AZO)C 12 ISA molecules are found when 1-octanol and 1-undecanol are used as a solvent. The cis and trans isomers of C 12 (AZO)C 12 ISA, the reagent and reaction product of a reversible photoinduced reaction, are simultaneously present and are both structurally identified at the liquid/graphite interface.
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Vanoppen et al. (1996) studied this question.
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