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Structural Features of a Clay Film Hybridized with a Zwitterionic Molecule as Analyzed by Second-Harmonic Generation Behavior

Published online by Cambridge University Press:  01 January 2024

Yuichirou Ogata ,
Jun Kawamata ,
Chin-Hong Chong ,
Akihiko Yamagishi  and
Gunzi Saito
Yuichirou Ogata
Affiliation:
Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
Jun Kawamata*
Affiliation:
Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan
Chin-Hong Chong
Affiliation:
Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
Akihiko Yamagishi
Affiliation:
Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
Gunzi Saito
Affiliation:
Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
*
*E-mail address of corresponding author: kawamata@imd.es.hokudai.ac.jp
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Abstract

Hybrid Langmuir-Blodgett (LB) films of a single clay layer and a donor-(π-electron system)-acceptor (Dδ-π-Aδ−) zwitterionic molecule (ind-TCNQ), prepared from 1,3,3-trimethyl-2-methyleneindoline (donor) and 7,7,8,8-tetracyanoquinodimethane (acceptor) were prepared. The characteristics of the electrostatic interaction between the clay layer and the ind-TCNQ molecules were investigated. The amount of ind-TCNQ molecules spread onto the air-water interface was increased systematically so that mono- and multi-layers of the molecules could be formed on the clay layer. The hybrid LB films, which were deposited onto a solid substrate, were characterized by means of UV-vis absorption spectroscopy and optical second-harmonic generation measurement. The amount of ind-TCNQ molecules adsorbed on the clay layer increased with an increase in the amount of ind-TCNQ molecules spread onto the air-water interface. On the other hand, the SHG intensities of the films did not change with the change in amount of ind-TCNQ spread. The results indicate that the electrostatic interaction between the clay layer and the ind-TCNQ molecules operates only in the region where the ind-TCNQ molecules are in direct contact with the clay layer.

Keywords

ClayHybrid Langmuir-Blodgett FilmSecond-harmonic GenerationSodium MontmorilloniteTCNQ DerivativesZwitterionic Molecules
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 2 , April 2003 , pp. 181 - 185
Copyright
Copyright © 2003, The Clay Minerals Society

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