Catching a molecule at the air-water interface: Dynamic pore array for molecular recognition

被引:0
|
作者
Katsuhiko Ariga
Takashi Nakanishi
Yukiko Terasaka
Jun-ichi Kikuchi
机构
[1] National Institute for Materials Science (NINS),Supermolecules Group
[2] Nara Institute of Science and Technology (NAIST),Graduate School of Materials Science
来源
Journal of Porous Materials | 2006年 / 13卷
关键词
Molecular recognition; Air-water interface; Monolayer; Pore; Dynamic;
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中图分类号
学科分类号
摘要
As a soft and flexible porous structure, a pore array of a steroid cyclophane SC(OH), which consists of the rigid 1,6,20,25-tetraaza[6.1.6.1]paracyclophane ring connected to four steroid moieties (cholic acid) through flexible L-lysine spacers, was prepared at the air-water interface. As confirmed by surface pressure (π)-molecular area (A) isotherms, transition between open conformation and cavity conformation of the SC(OH) molecule was reversibly induced upon repeated compression and expansion of its monolayer at pH 11 where amino groups of the lysine residues are not fully deprotonated. Capture and release of an aqueous fluorescent guest (TNS) by SC(OH) was observed upon dynamic cavity formation through surface fluorescence spectroscopy. At pH 12, dynamic cavity formation of SC(OH) was sufficiently suppressed, and the capture and release of an aqueous TNS by the monolayer was not virtually observed. Lessened electrostatic repulsion between the SC(OH) molecules due to conversion of ammonium to free amine may prevent the cavity from reopening. The importance of dynamic nature of cavity formation on the guest binding was also proved by control experiments using SC(H), which cannot form cavity conformation at any surface pressures at both pH 11 and 12.
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页码:427 / 430
页数:3
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