Single-molecule spectroscopic investigation of energy migration processes in cyclic porphyrin arrays.
Single-molecule spectroscopic investigation of energy migration processes in cyclic porphyrin arrays.
复制标题
循环卟啉阵列中能量迁移过程的单分子光谱研究。
DOI：
10.1021/ja065813n
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发表时间：
2007
影响因子：
15
通讯作者：
Dongho Kim
中科院分区：
文献类型：
--
作者：
Mira Park;Min;Z. S. Yoon;Takaaki Hori;Xiaobin Peng;N. Aratani;J. Hotta;H. Uji‐i;M. Sliwa;J. Hofkens;A. Osuka;Dongho Kim
已合成了钴连接的环状卟啉阵列，以模仿天然捕光装置，并研究在这些系统中发生的高效能量迁移过程，以用于分子光子学的未来应用。为了避免整体平均的图片，我们进行了单分子光谱研究的能量迁移过程中的环状卟啉阵列和嵌入在刚性聚合物基质的线性模型化合物通过记录荧光强度轨迹，通过进行符合测量，并通过做宽场散焦成像。我们的研究表明，在单分子水平的环状卟啉阵列内的有效的能量迁移。通过与线性模型化合物的数据比较，我们可以确定双卟啉亚基之间的偶极偶极耦合和环状结构的刚性对能量传递过程的作用。
Covalently linked cyclic porphyrin arrays have been synthesized to mimic natural light-harvesting apparatuses and to investigate the highly efficient energy migration processes occurring in these systems for future applications in molecular photonics. To avoid an ensemble-averaged picture, we performed a single-molecule spectroscopic study on the energy migration processes of cyclic porphyrin arrays and a linear model compound embedded in a rigid polymer matrix by recording fluorescence intensity trajectories, by performing coincidence measurements, and by doing wide-field defocused imaging. Our study demonstrates efficient energy migration within the cyclic porphyrin arrays at the single-molecule level. By comparison with the data of the linear model compound, we could pinpoint the role of the dipole-dipole coupling between diporphyrin subunits and the rigidity of the cyclic structures on the energy transfer processes.