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- W2058653772 abstract "The position of azobenzene groups in the interior or at the surface of a dendrimer affects their photochemical behavior (trans–cis photoisomerization and thermal back-isomerization, illustrated here). The synthesis and investigation of several series of dendrimers bearing azobenzene derivatives within the branches and/or on the surface is described. We describe the synthesis of three series of phosphorus-containing dendrimers having azobenzene derivatives specifically placed at some generations in the interior and/or on the surface. The largest compound obtained possesses 48 azobenzene groups on the surface. Irradiation at 350 nm induces isomerization of the azobenzene groups from the E form to the Z form, whatever their location. The thermal back-isomerization to the E form in the dark at room temperature was observed in all cases. The kinetics of this Z→E back-isomerization was studied in several cases; the rate is not dependent on the number of azobenzene units or of the generation, when the azobenzene groups are linked to the surface of the dendrimer. A different behavior was observed when the azobenzene groups were located within the framework of the dendrimer. La synthèse de trois séries de dendrimères phosphorés ayant des dérivés de l'azobenzène placés spécifiquement à l'intérieur et/ou à la surface est décrite. Le plus grand composé obtenu possède 48 groupements azobenzène en surface. L'irradiation à 350 nm provoque l'isomérisation des groupements azobenzène de la forme E vers la forme Z, quelle que soit leur localisation. L'isomérisation thermique de retour vers la forme E, à température ambiante dans le noir, est observée dans tous les cas. La cinétique de cette isomérisation retour Z→E a été étudiée dans plusieurs cas; lorsque les groupes azobenzène sont greffés à la surface du dendrimère, la vitesse ne dépend pas de leur nombre, ni de la génération. Un comportement différent est observé lorsque les groupes azobenzène sont situés à l'intérieur de la structure du dendrimère." @default.
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- W2058653772 date "2002-05-03" @default.
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- W2058653772 title "Synthesis and Photochemical Behavior of Phosphorus Dendrimers Containing Azobenzene Units within the Branches and/or on the Surface" @default.
- W2058653772 doi "https://doi.org/10.1002/1521-3765(20020503)8:9<2172::aid-chem2172>3.0.co;2-g" @default.
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