Several types of new materials containing photo- and thermo-switchable azobenzene moieties will be described.Azobenzene moieties can be introduced to the surface of silica nanoparticles (NP) by using multifunctional ligands. First, a previously unknown monomer with three functional groups (FG) was designed and synthesized. We then used the alkyne FG to �click� the monomer to the silica NP surface with 100 % efficiency. Kinetics of reversible cis-trans isomerization of the azo-bridge FG were investigated for surface-bound and dissolved monomer. The remaining phenol FG is available for further synthetic elaboration.Azobenzene moieties can be incorporated into main chain of polymers via step-growth polymerization. By using bis- and tris-functionalized linkers, linear and branched structures can be obtained.Finally, linear or macrocyclic polymers containing azobenzene moieties in side chains can be synthesized by atom-transfer radical-polymerization, alone or followed by click-cyclization, respectively.Cis-trans switching of azo moieties within polymeric structures is under investigation.

New materials with azobenzene moieties: Synthesis and characterization

245th National Meeting (2013)

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