Substituent-control exciton in J-aggregates of protonated water-insoluble porphyrins
Substituent-control exciton in J-aggregates of protonated water-insoluble porphyrins
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DOI：
10.1021/ja017768j
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发表时间：
2003-03-05
影响因子：
15
通讯作者：
Segawa, H
中科院分区：
文献类型：
--
作者：
Okada, S;Segawa, H
通过水不溶性四苯基卟啉衍生物在液-液或气-液界面上的聚集，制备了一系列质子化卟啉J-聚集体。使用原子力显微镜，我们观察到的微晶卟啉J-聚集体。J-聚集体具有两个强激子带，对应于质子化卟啉的B（Soret）-和Q-带。有趣的是，低激子的激发能（用S1表示）明显依赖于中位取代基，而高激子的激发能（用S2表示）不依赖于它们。这些结果表明，S1跃迁偶极矩的激子耦合的性质可以系统地改变取代基。
A series of protonated porphyrin J-aggregates of various water-insoluble tetraphenylporphyrin derivatives was prepared by aggregation at the liquid-liquid or gas-liquid interface. Using atomic force microscopy, we observed microcrystalline porphyrin J-aggregates. The J-aggregates have two strong exciton bands corresponding to the B (Soret)- and Q-bands of the protonated porphyrin. Interestingly, the excitation energy of the lower exciton (denoted by S1) markedly depends on the meso-substituents, whereas that of the higher exciton (denoted by S2) does not depend on them. These results indicate that the nature of the exciton coupling of the S1 transition dipole moment can be systematically changed by the substituents.