Positional selectivity of reversible azomethine condensation reactions at solid/liquid interfaces leading to supramolecule formation

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• 作者：Ryota Tanoue^a ; Rintaro Higuchi^a ; Kiryu Ikebe^a ; Shinobu Uemura^a ; Nobuo Kimizuka^b ; ^c ; Adam Z. Stieg^d ; ^e ; James K. Gimzewski^d ; ^e ; ^f ; Masashi Kunitake^a ; ^b ; ^{kunitake@kumamoto-u.ac.jp" class="auth_mail}
• 关键词：In situ scanning tunneling microscopy ; Two-dimensional supramolecular assembly ; Schiff base (azomethine) coupling ; Position-selective reaction
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：1 March, 2014
• 年：2014
• 卷：716
• 期：Complete
• 页码：145-149
• 全文大小：1897 K

文摘

We used in situ scanning tunneling microscopy to investigate the formation of two-dimensional supramolecules by means of reversible azomethine condensation reactions between aqueous 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP) and terephthaldicarboxaldehyde (TPA) or benzaldehyde (BA) at the solid/liquid interface of an iodine-modified Au(1 1 1) surface. A nanomesh and a close-packed array were formed by the reaction of TAPP with the dicarboxaldehyde. Formation of these structures was driven by Schiff base (azomethine) bonding and simultaneous self-assembly controlled by adsorption and condensation equilibria. Surface cross coupling between TAPP and the monocarboxaldehyde (BA) formed highly ordered adlayers consisting solely of TAPP symmetrically disubstituted with two BA molecules attached at diagonally opposite corners. The position selectivity was achieved through simultaneous coupling reaction equilibria and the thermodynamic self-assembly.