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Significance Applying magnetic fields is a powerful strategy to study the electronic properties of inorganic materials and paramagnetic organic systems due to their straightforward Zeeman interactions. We demonstrate with magnetic fields almost 1 million times stronger than that of Earth (up to 25 T) that we can perturb the optoelectronic properties of model “nonmagnetic” organic chromophores. These perturbations arise from the induction of ring currents in these aromatic molecules, which explains the increased relative magnetic sensitivity of the molecular aggregates in comparison to molecules in solution, in analogy to a molecular solenoid. Our results hint that magnetic fields may provide a new handle to control the optoelectronic properties of molecular systems to make new multifunctional and magnetosensitive organic devices.

Ring currents modulate optoelectronic properties of aromatic chromophores at 25 T