Résumé The design of porphyrin-based dendrimers featuring conjugated fluorenyl dendrons via alkene spacers allows evaluating the importance of the role of these spacers on the optical properties of interest. In the continuation of previous studies, a second-generation porphyrin-based dendrimer was synthesized and metalated by Zn(II) along with its known first-generation homologue. The targeted free-base porphyrin was obtained by repetitively cycling a Michaelis–Arbuzov reaction and a Horner–Wadsworth–Emmons reaction to construct the desired vinyl-containing dendrons. After metalation by Zn(II), meso-tetraphenylporphyrin-cored dendrimers with eight (ZnTPP-D1) and sixteen (ZnTPP-D2) fluorenyl arms at their periphery were eventually isolated. These species allow evaluating the influence of the central metal and of the 1,2-alkyne for 1,2-alkene exchange on fluorescence, oxygen photosensitization, and two-photon absorption. Such structure–property relationships are currently needed for the design of optimal dendrimeric photosensitizers allowing combined two-photon-based photodynamic therapy (2P-PDT) and imaging. Supplementary Materials: Supplementary material for this article is supplied as a separate file: crchim-99-suppl.pdf
摘要:基于
卟啉的树状聚合物设计,通过烯烃间隔基评估这些间隔基对光学性质的重要性。在之前研究的基础上,合成了第二代基于
卟啉的树状聚合物,并通过Zn(II)
金属化处理,同时也对其已知的第一代同类物进行处理。目标游离碱
卟啉是通过反复循环迈克利斯–阿布佐夫反应和霍纳–瓦兹沃斯–埃蒙斯反应来构建所需的含
乙烯基的树突状分子。经过Zn(II)
金属化后,最终得到了以介-
四苯基卟啉为核心的树状聚合物,其周边分别具有八个(Zn
TPP-D1)和十六个(Zn
TPP-D2)荧光基团。这些物质能够评估中心
金属和1,2-
炔烃在1,2-烯烃交换中的影响,涵盖荧光、氧光敏化和双光子吸收等领域。目前,这种结构-性质关系对于设计最佳的树状光敏剂至关重要,以实现基于双光子的光动力治疗(2P-PDT)和成像的结合。
附录材料:本文章的附录材料作为单独的文件提供:crchim-99-suppl.pdf。