[structure: see text] Based on the high affinity of phenanthroline-strapped porphyrins for imidazoles, building blocks for self-assembled, linear porphyrin architectures have been designed. Their synthesis is reported, and the assembly principle is illustrated by the formation of the shortest possible scaffold. Only one type of assembly is observed, and the stepwise energy transfer from the boron dipyrrylmethane (BODIPY) input to the free base output is highly efficient.

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