Dr. Mercedes Alonso, Prof. Paul Geerlings and Prof. Frank De Proft Topology Switching in Heptaphyrins Controlled by Solvent, Protonation, and meso Substituents Chemistry - A European Journal 19
Flicking the magnetic switch: 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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