Photoresponsive porous organosilicas
H. Garc�a
Instituto de Tecnología Química, Universidad
Politécnica de Valencia, Avda. de los Naranjos, 46022-Valencia,
Spain
Abstract: Novel structured functional hybrid materials
can be obtained by incorporating photoresponsive organic components
into the silicate walls of periodic mesoporous silicates. Two such materials
are described, containing either viologens or stilbene analogs. Thermal
or photochemical activation of viologen units generates the corresponding
radical cations, whose lifetime can vary from months to milliseconds,
depending on the surfactant content of the solid. In a second example,
the porosity and tortuosity of the silicate can be modulated by irradiation
of an organosilica containing a stilbene-like moiety.
* Lectures presented at the XIXth IUPAC Symposium on Photochemistry, Budapest, Hungary, 14�19 July 2002. Other presentations are published in this issue, pp.999�1090.
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