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Stoichiometric Complexes between Cyclic Phenylazomethines and a Dialkyl Phosphate for Molecular Tiling at the Air–Water Interface

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Abstract:

The molecular tiling method is proposed as a novel methodology to provide an artificial molecular arrangement at the air–water interface by assembling rigid amphiphilic units like tile pieces. In this study, the mixed monolayers of cyclic phenylazomethine (CPA) as a rigid triangle basement and dihexadecyl phosphate (DHP) as a monolayer-forming component were investigated by A isotherm measurement and Fourier transform infrared (FTIR) spectroscopy in the reflection–absorption mode in order to provide basic knowledge of molecular tiling design. Although the CPA molecules alone cannot form a stable monolayer on water, monolayers of DHP/CPA mixtures showed two-step condensed phases that reflect two kinds of assembling modes of alkyl chains of these components. FTIR spectra of the transferred monolayers indicated specific interaction of the amine part in CPA and the phosphate moiety of DHP. A isotherms of the systematic change in the mixing ratio revealed the binding stoichiometry between DHP and the CPA to be 3:1. Interaction of DHP molecules to three basic sites of CPA and matching in cross-sectional area between three DHP molecules and CPA core would result in the stable formation of the 3:1 complex.

Keywords: AIR-WATER INTERFACE; FTIR SPECTROSCOPY; MOLECULAR RECOGNITION; MOLECULAR TILING; MONOLAYER; PI-A ISOTHERM

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2002.147

Affiliations: 1: Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), Ikoma, Nara 630-0101, Japan 2: Department of Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan

Publication date: December 1, 2002

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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