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Intercalation of an amphiphilic azobenzene derivative into the interlayer space of a layered silicate, magadiite

¹ PRESTO, Japan Science and Technology Corporation and ² Department of Earth Sciences, Waseda University, Nishiwaseda 1-6-1, Shinjuku-ku, Tokyo 169-8050, ³ Department of Applied Chemistry, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555, and ⁴ Kagami Memorial Laboratory for Materials Science and Technology, Waseda University, Nishiwaseda 2-8-26, Shinjuku-ku, Tokyo 169-0051, Japan

^* E-mail: makoto{at}mn.waseda.ac.jp

(Received 4 May 2000; revised 21 August 2000)

Intercalation of an ammonium amphiphile having an azobenzene chromophore, 4-dodecyloxy-4'-(trimethylammoniopentyloxy)azobenzene and 4-(-trimethylammoniodecyloxy)-p'-(octyloxy)azobenzene bromide, into the layered silicate magadiite (ideal formula Na₂Si₁₄O₂₉·nH₂O) was carried out by a conventional ion exchange reaction in an aqueous medium. An intercalation compound with the ideal formula {(C₁₂AzoC₅N+)_1.4H_0.6·Si₁₄O₂₉·nH₂O} was obtained. Based on the change in the basal spacing (to 4.21 nm) after the reaction and the visible absorption spectrum of the product, the intercalated azo dyes appear to form a J-aggregate in the interlayer space of magadiite. Under UV and visible light irradiation, the intercalated azo chromophore exhibited reversible transcis isomerization in the interlayer space of magadiite. This is the first successful report of photochemical reactions of guest species in the interlayer space of magadiite.

KEYWORDS: magadiite, layered silicate, intercalation, azobenzene, photoisomerization, nanocomposite

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