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STRUCTURAL FEATURES OF A CLAY FILM HYBRIDIZED WITH A ZWITTERIONIC MOLECULE AS ANALYZED BY SECOND-HARMONIC GENERATION BEHAVIOR

¹ Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan
² Research Institute for Electronic Science, Hokkaido University, Sapporo 060-0812, Japan
³ Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

^* E-mail address of corresponding author: kawamata{at}imd.es.hokudai.ac.jp

Hybrid Langmuir-Blodgett (LB) films of a single clay layer and a donor-(-electron system)-acceptor (D --A^–) zwitterionic molecule (ind-TCNQ), prepared from 1,3,3-trimethyl-2-methyleneindo-line (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.

Key Words: Clay • Hybrid Langmuir-Blodgett Film • Second-harmonic Generation • Sodium Montmorillonite • TCNQ Derivatives • Zwitterionic Molecules