To determine optimum conditions for large photoresponses, the alkyl chain l
ength and the concentration of trimethyl-alkylammonium (TMAA) were varied t
o prepare 16 o-TSM hosts for organophilic fluor-tetrasilicic mica (o-TSM) I
azobenzene (AzBz) complexes. Photoresponses for AzBz/o-TSM complexes prepa
red by vapor-phase intercalation of AzBz into o-TSM were monitored by chang
es in d(001) under UV irradiation (lambda = 365 nm). A large photoresponse,
a 0.2-0.5 nm decrease in d(001), was observed for the complexes with o-TSM
hosts having a pseudo-trimolecular structure with 2.2-2.5 nm basal spacing
. The complexes with less or no photoresponse were derived from o-TSM with
bimolecular and paraffin-type structures. These results indicate that photo
responsiveness is closely related to the structure of the o-TSM hosts, and
that pseudo-trimolecular-structure o-TSM can provide complexes with good ph
otoresponsive properties. (C) 2001 Elsevier Science Ltd. All rights reserve
d.