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Issue 2, 2005
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Effect of guest capture modes on molecular recognition by a dynamic cavity array at the air–water interface: soft vs. tight and fast vs. slow

Katsuhiko Ariga,*a  Takashi Nakanishi,a  Jonathan P. Hill,b  Yukiko Terasaka,c  Daisuke Sakaic  and  Jun-ichi Kikuchic 
Author affiliations

* Corresponding authors

a Supermolecules Group, Advanced Materials Laboratory, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
E-mail: ARIGA.Katsuhiko@nims.go.jp
Fax: +87-29-860-4832
Tel: +81-29-860-4597

b International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan

c Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama-cho, Ikoma 630-0192, Japan

Abstract

Dynamic aspects of molecular recognition at the air–water interface have been investigated using a monolayer 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. An aqueous fluorescent guest (TNS) can be reversibly captured by SC(OH) with a variation in the accompanying fluorescence emission upon compression and expansion of the SC(OH) monolayer. Tight capture, by compression of the monolayer to a high surface pressure, efficiently enhances fluorescence intensity because of suppression of formation of the non-emissive state. On the other hand, rapid motion of the reversible cavity formation by a high rate of compression and expansion of the monolayer results in better reproducibility in the fluorescence change than that obtained under a slower motion, which can be explained by the suppression of unfavorable structural relaxation within the monolayer structures. This result has connotations for the development of novel molecular devices and machines that operate through mechanically driven molecular recognition.

Graphical abstract: Effect of guest capture modes on molecular recognition by a dynamic cavity array at the air–water interface: soft vs. tight and fast vs. slow

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Publication details

The article was received on 07 Feb 2005, accepted on 05 Apr 2005 and first published on 15 Apr 2005


Article type: Paper
DOI: 10.1039/B501945A
Citation: Soft Matter, 2005,1, 132-137
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    Effect of guest capture modes on molecular recognition by a dynamic cavity array at the air–water interface: soft vs. tight and fast vs. slow

    K. Ariga, T. Nakanishi, J. P. Hill, Y. Terasaka, D. Sakai and J. Kikuchi, Soft Matter, 2005, 1, 132
    DOI: 10.1039/B501945A

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