A New Intercalation Method of Azobenzene into Montmorillonite and Its Spectroscopic Evaluation

Autor:	Teruyuki Nakato, Munetaka Nakata, Ryota Shinozaki, Kenji Ujike, Satoshi Kudoh
Rok vydání:	2006
Předmět:	chemistry.chemical_compound Crystallography Montmorillonite Materials science chemistry Absorption spectroscopy Photoisomerization Azobenzene Intercalation (chemistry) Inorganic chemistry Infrared spectroscopy Molecule Ionic bonding
Zdroj:	Journal of the Spectroscopical Society of Japan. 55:120-125
ISSN:	1884-6785 0038-7002
DOI:	10.5111/bunkou.55.120
Popis:	We tried to intercalate azobenzene into the interlayer spaces of montmorillonite by mixing fused azobenzene with solid montmorillonite after removing water molecules in the interlayer spaces by heating. The intercalation of azobenzene was confirmed by measuring the IR spectra and X-ray diffraction patterns. This is a new method of intercalation by use of the weak interaction between azobenzene and montmorillonite, which is different from previous methods of intercalation where either azobenzene is modified by an ionic substituent or montmorillonite is modified by an ionic surfactant. Reversible changes in the basal spacing of about 0.03-0.04 nm by UV or Vis irradiation were confirmed by the corresponding reversible changes in the electronic absorption spectra and the Xray diffraction patterns. A new model of intercalation is proposed, such that planar trans azobenzene molecules, which exist parallel to one another in the layers, dilate the interlayer by photoisomerization to non-planar cis azobenzene.
Databáze:	OpenAIRE
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