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Dr. Mercedes Alonso, Prof. Paul Geerlings and Prof. Frank De Proft Topology Switching in [32]Heptaphyrins Controlled by Solvent, Protonation, and meso Substituents Chemistry - A European Journal 19

Article first published online: 18 DEC 2012 | DOI: 10.1002/chem.201203295

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Flicking the magnetic switch: [32]Heptaphyrin can switch between three distinct π-conjugation topologies without breaking the macrocycle (see scheme). Protonation, solvent, and meso substituents control the topology. In the neutral state, the antiaromatic figure-eight conformation is preferred by most substituents. However, mono- and triprotonated species adopt an aromatic Möbius structure. Topology switching induces a large change in magnetic properties.

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