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• W2131909599 abstract "Abstract 7,8‐Dehydropurpurin has attracted much attention owing to the dual 18π‐ and 20π‐electron circuits in its macrocyclic conjugation. The two‐fold Pd‐catalyzed [3+2] annulation of meso ‐bromoporphyrin with 1,4‐diphenylbutadiyne furnished 7,8‐dehydropurpurin dimers. The 8 a ,8 a ‐linked dimer displays a red‐shifted and enhanced absorption band in the NIR region and a small electrochemical HOMO–LUMO band gap as a consequence of efficient conjugation between the two coplanar 7,8‐dehydropurpurin units. Treatment of this dimer with N ‐bromosuccinimide in chloroform and ethanol gave β‐to‐β vinylene‐bridged porphyrin dimers. Owing to the highly constrained conformations, these dimers exhibit perturbed absorption spectra, small Stokes shifts, and high fluorescence quantum yields." @default.
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• W2131909599 date "2014-03-18" @default.
• W2131909599 modified "2023-10-18" @default.
• W2131909599 title "Synthesis of 7,8-Dehydropurpurin Dimers and Their Conversion into Conformationally Constrained β-to-β Vinylene-Bridged Porphyrin Dimers" @default.
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• W2131909599 doi "https://doi.org/10.1002/anie.201400632" @default.
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