Supramolecular porphyrin assemblies through amidinium-carboxylate salt bridges and fast intra-ensemble excited energy transfer.
Supramolecular porphyrin assemblies through amidinium-carboxylate salt bridges and fast intra-ensemble excited energy transfer.
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DOI：
10.1002/chem.200400152
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发表时间：
2004-07
期刊：
影响因子：
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通讯作者：
J. Otsuki;K. Iwasaki;Yosuke Nakano;M. Itou;Y. Araki;O. Ito
中科院分区：
文献类型：
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作者：
J. Otsuki;K. Iwasaki;Yosuke Nakano;M. Itou;Y. Araki;O. Ito
通过形成脒-羧酸盐桥，构建了锌和游离碱卟啉的明确超分子组装体。研究了一对一的供体-受体对和四对一的天线型组件。稳态和时间分辨荧光测量明确表明，在这些组件中发生了从锌-卟啉复合物到游离碱卟啉的有效单线态-单线态激发能量转移。事实上，在两种类型的组件中观察到的能量转移速率比福斯特机制所暗示的能量转移速率要快得多，这意味着分子间通过键合机制的参与。
Well-defined supramolecular assemblies of Zn and free-base porphyrins are constructed through the formation of amidinium-carboxylate salt bridges. A one-to-one donor-acceptor pair and a four-to-one antenna-type assembly are investigated. The steady-state and time-resolved fluorescence measurements unequivocally showed that efficient singlet-singlet excited energy transfer from the Zn-porphyrin complex to the free-base porphyrin takes place in these assemblies. Indeed, the observed energy-transfer rates in both types of assemblies are much faster than those the Förster mechanism would suggest, implying the involvement of an intermolecular through-bond mechanism.