COLL 514 |
| Yu-Tai Tao, Ming-Hsien Hsu, and Jain-Jain Lin. Institute of Chemistry, Academia Sinica, #128 Sec. 2, Yen-chiu-Yuan Rd, Taipei, 11529, Taiwan |
| Self-assembled monolayers （SAMs） of n-hexadecanoic acid and, p-terphenylcarboxylic acid were prepared onto silver surface by adsorption from a solution of respective compound, all through the carboxylate/silver （-CO2-/Ag+） interaction. A brief exposure of the monolayer to H2S vapor leads to immediate protonation of the carboxylate head groups and reorganization of the resulting free acid molecules in the monolayer into clusters of H-bonded dimers of the acid. Mixed monolayer prepared from n-hexadecanoic acid and p-terphenylcarboxylic acid appears to form domains of respective component on silver surface. H2S-exposure of the mixed-monolayer also leads to a reorganization of the molecules in the mixed monolayer.into clusters of respective compounds, resembling a recrystallization process occurring in two dimensions. Spectroscopic evidence as well as real-time imaging of the reorganization process will be discussed. |
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Adamson Award Symposium Honoring Dave Allara and Ralph Nuzzo
Division of Colloid and Surface Chemistry |