Heteroleptic Tetrapyrrole‐Fused Dimeric and Trimeric Skeletons with Unusual Non‐Frustrated Fluorescence |
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| Authors: | Yuehong Zhang Juwon Oh Dr Kang Wang Chao Chen Dr Wei Cao Kyu Hyung Park Prof?Dr Dongho Kim Prof?Dr Jianzhuang Jiang |
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| Institution: | 1. Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, University of Science and Technology Beijing, Beijing, P.R. China;2. Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul, Korea |
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| Abstract: | Phthalocyanine (Pc) and porphyrin (Por) chromophores have been fused through the benzoα]pyrazine moiety, resulting in unprecedented heteroleptic tetrapyrrole‐fused dimers and trimers. The heteroleptic tetrapyrrole nature has been clearly revealed based on single‐crystal X‐ray diffraction analysis of the zinc dimer. Electrochemical analysis, theoretical calculations, and time‐resolved spectroscopic results disclose that the two/three‐tetrapyrrole‐fused skeletons behave as one totally π‐conjugated system as a result of the strong conjugative interaction between/among the tetrapyrrole chromophores. In particular, the effectively extended π‐electron system through the fused‐bridge induced strong electronic communication between the Pc and Por moieties and large transition dipole moments in the Pc–Por‐fused systems, providing high fluorescence quantum yields (>0.13) and relatively long excited state lifetimes (>1.3 ns) in comparison with their homo‐tetrapyrrole‐fused analogues. |
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| Keywords: | fluorescence fused systems oligomers phthalocyanine porphyrins |
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