Photoinduced Electron-Transfer within Free Base and Zinc Porphyrin Containing Poly(Amide) Dendrimers
作者:Cheruvallil S. Rajesh、Gregory J. Capitosti、Susan J. Cramer、David A. Modarelli
DOI:10.1021/jp010575y
日期:2001.10.1
designed for use as mimics of the photosynthetic reaction center. Red-shifts in the absorption spectra, particularly in the anthraquinone-terminated series, were interpreted as resulting from backfolding of the dendrimer branches. Dendrimers FbP-Ga-AQn were shown to exhibit substantial quenching (58−75%) of the porphyrin fluorescence as measured against the analogous ethyl-terminated dendrimers (FbP-Ga-Etn)
一系列游离碱和锌卟啉的合成和光物理表征,Newkome 型树枝状大分子以蒽醌基团(FbP-Ga-AQn 和 ZnP-Ga-AQn)和乙基(FbP-Ga-Etn 和 ZnP-Ga 为末端) -Etn) 进行了描述。这些树枝状大分子被设计用作光合反应中心的模拟物。吸收光谱的红移,特别是在蒽醌终止的系列中,被解释为由树枝状大分子分支的反折叠引起的。在稳态荧光实验中,树枝状大分子 FbP-Ga-AQn 与类似的乙基末端树枝状大分子 (FbP-Ga-Etn) 相比,显示出显着的卟啉荧光猝灭 (58-75%)。含有锌卟啉的树枝状大分子 ZnP-Ga-AQn 表现出几乎完全猝灭 (96-99.5%) 的卟啉荧光。提出了一种分子内电子转移机制来显着降低这两个树枝状大分子系列中的荧光。时间分辨荧光...