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首页> 外文期刊>Chemistry: A European journal >Synthesis and photochemical behavior of phosphorus dendrimers containing azobenzene units within the branches and/or on the surface
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Synthesis and photochemical behavior of phosphorus dendrimers containing azobenzene units within the branches and/or on the surface

机译：支链内和/或表面上含偶氮苯单元的磷树枝状聚合物的合成及光化学行为

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摘要

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-isomerizations 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.
机译：我们描述了三个系列的含偶氮苯衍生物的含磷树枝状大分子的合成，这些衍生物专门放置在内部和/或表面的某些世代。得到的最大化合物在表面上具有48个偶氮苯基。在350 nm处进行辐照会导致偶氮苯基团从E形变为Z形，无论其位置如何。在所有情况下，在黑暗中于室温下观察到热反异构化为E形式。在几种情况下研究了这种Z-> E反向异构化的动力学。当偶氮苯基团连接到树枝状大分子的表面上时，该速率不取决于偶氮苯单元的数目或生成量。当偶氮苯基团位于树枝状聚合物的框架内时，观察到不同的行为。

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