In this work, the synthesis and spectroscopic characterization of new zinc porphyrin-anthraquinone dyads is proposed. In particular, electron donor units based on zinc meso-tetraphenylporphyrin (ZnTPP) and zinc octaethylporphyrin (ZnOEP) have been coupled with differently substituted anthraquinones as acceptors. The quinone moiety was properly functionalized with imidazole, thus ensuring porphyrin complexation through zinc ion coordination. Accordingly, absorption and emission measurements demonstrated that the coordination occurred, and calculated binding constants were in the range 6.6 ffl 103–3.9 ffl 104 M-1. Transient absorption spectroscopy for ZnTPP and ZnOEP dyads demonstrated that the electron transfer occurred, with the formation of the corresponding charge separated state, ZnTPP+-AQ. Moreover, in ZnOEP complexes, a strong correlation between the chain length and flexibility with the charge separated state lifetime was observed.

中文翻译：

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锌卟啉-蒽醌咪唑超分子二元体

在这项工作中，提出了新型锌卟啉-蒽醌二元化合物的合成和光谱表征。特别是，基于锌的电子供体单元中观-四苯基卟啉（锌TPP) 和八乙基卟啉锌 (氧化锌) 已与不同取代的蒽醌作为受体偶联。醌部分用咪唑适当地官能化，从而通过锌离子配位确保卟啉络合。因此，吸收和发射测量表明发生了配位，计算的结合常数在 6.6 范围内ffl103–3.9ffl104米-1. 瞬态吸收光谱锌TPP和氧化锌dyads 证明发生了电子转移，形成了相应的电荷分离态，锌TPP+-AQ. 此外，在氧化锌配合物，观察到链长和柔韧性与电荷分离态寿命之间的强相关性。