Synthetic study demonstrates panchromatic absorption and narrow HOMO-LUMO gaps in fused PAH-porphyrin hybrids, highlighting their utility for broad-spectrum light-harvesting applications.
The rational synthesis of three β-meso-fused porphyrins with a step-wise increasing π-system size is presented. The synthetic route, which introduces a five-membered ring between the macrocycle and an aromatic fragment, is modular in its nature and proceeds straightforwardly. The well-soluble conjugates have intriguing optical properties, namely bathochromically shifted and flattened absorption curves. Density functional theory (DFT) calculations provide insights into the electronic structure and transitions, unveiling small HOMO-LUMO gaps.
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Oleszak et al. (2025) studied this question.
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