Issue 48, 2014

Azobenzene–siloxane hybrids with lamellar structures from bridge-type alkoxysilyl precursors

Abstract

Lamellar azobenzene–siloxane hybrids were prepared by controlled hydrolysis and polycondensation of three types of precursors, where azobenzene is sandwiched by mono-, di- and triethoxysilyl groups using propylene linkers. All precursors underwent reversible and fast transcis isomerization upon UV/Vis irradiation in dilute solution. Upon hydrolysis of the triethoxysilylated precursor in a homogeneous solution under acidic conditions, precipitation occurred by self-assembly of hydrolyzed monomers into a lamellar structure. Although di- and mono-ethoxysilylated precursors produced less ordered products under identical conditions, highly ordered lamellar films were obtainable either by evaporation induced self-assembly of the hydrolyzed monomers or by solid-state reactions of precursor films. The degree of transcis isomerization of azobenzene moieties in the hybrid films was enhanced by decreasing the cross-linking degree of siloxane networks using precursors with less condensable alkoxy groups.

Graphical abstract: Azobenzene–siloxane hybrids with lamellar structures from bridge-type alkoxysilyl precursors

Supplementary files

Article information

Article type
Paper
Submitted
26 Feb 2014
Accepted
27 May 2014
First published
29 May 2014

RSC Adv., 2014,4, 25319-25325

Author version available

Azobenzene–siloxane hybrids with lamellar structures from bridge-type alkoxysilyl precursors

S. Guo, W. Chaikittisilp, T. Okubo and A. Shimojima, RSC Adv., 2014, 4, 25319 DOI: 10.1039/C4RA01709A

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