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Issue 32, 2010
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Preparation of lamellar inorganic–organic hybrids from tetraethoxysilane and a coumarin derivative containing a triethoxysilylgroup and photodimerization of the interlayer coumaringroups

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Abstract

Lamellar inorganic–organic hybrids were prepared as powders and films via hydrolysis and cocondensation of tetraethoxysilane (TEOS) and a coumarin derivative containing a triethoxysilyl group. The formation of lamellar structures consisting of siloxane layers and interlayer coumarin groups with ca. 4 nm periodicities, revealed by XRD and TEM, is induced by self-assembly of the oligomeric species derived from TEOS and the derivative. The UV–vis absorption spectrum of the as-synthesized hybrid film showed an absorption maximum blue-shifted from that observed for a CHCl3 solution of the monomeric coumarin derivative, which supports the formation of a face-to-face structure of the interlayer coumarin groups. Dimerization of the coumarin groups occurred by irradiation with visible light (>310 nm). The groups in the lamellar hybrid film showed faster dimerization and the yield of dimers was higher, if compared with those in a disordered hybrid film and the neat coumarin derivative, indicating the efficient dimerization of the chromophores with a controlled arrangement. The molecular design of a coumarin derivative strongly influences the property of hybrids as well as the mesostructural formation.

Graphical abstract: Preparation of lamellar inorganic–organic hybrids from tetraethoxysilane and a coumarin derivative containing a triethoxysilyl group and photodimerization of the interlayer coumarin groups

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Article information


Submitted
13 Feb 2010
Accepted
12 May 2010
First published
01 Jul 2010

J. Mater. Chem., 2010,20, 6688-6695
Article type
Paper

Preparation of lamellar inorganic–organic hybrids from tetraethoxysilane and a coumarin derivative containing a triethoxysilyl group and photodimerization of the interlayer coumarin groups

S. Nasu, A. Tsuchiya and K. Kuroda, J. Mater. Chem., 2010, 20, 6688
DOI: 10.1039/C0JM00407C

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