Self-Directed Assembly of Photoactive Hybrid Silicates Derived from an Azobenzene-Bridged Silsesquioxane

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DOIResolve DOI: http://doi.org/10.1021/ja027991wS0002-7863(02)07991-X
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TypeArticle
Journal titleJ. Am. Chem. Soc
ISSN00027863
Volume124
Issue49
Pages1454014541; # of pages: 2
AbstractHybrid silicate materials derived from organo-bridged silsesquioxane precursors, RO3-Si-R'-Si-OR3, where R and R' are organic ligands, represent a remarkably diverse class of nanocomposites capable of forming both Si-O-Si and Si-C-Si bonds with molecular scale homogeneity. Recently, in an effort to better control their structure and function, surfactant-directed self-assembly or self-directed assembly has been used to synthesize hierarchical organo-bridged polysilsesquioxanes that exhibit order over multiple length scales. Here we report the synthesis and self-directed assembly of an optically active azobenzene-bridged silsesquioxane, 4,4'-bis(3-triethoxysilylpropylureido)azobenzene 1. Hydrogen-bonding interactions between the three active centers of the bis-ureide groups (-NH-CO-NH) combined with - interactions between the azobenzene groups serve to self-assemble 1 into a highly ordered lamellar mesostructure in which the d-spacing is optically controlled through photoisomerization of the azobenzene moiety before or after assembly.
Publication date
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
Identifier10072378
NPARC number12338365
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Record identifier4f3f0efa-b896-4237-8b08-bcf225a9d54d
Record created2009-09-10
Record modified2016-05-09
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