A paramagnetic/diamagnetic molecular switch

Fraser Stoddart’s group have reported a catenane molecule that can be oxidised to a stable paramagnetic radical state. The oxidation states of the molecule are easily configurable, so this structure has significant potential for use in data storage on the molecular level.

From the Chemistry World article:

The key to the stability of the new radical compound is the mechanical bond that links the two macrocycles, forcing the charged species to remain close. And that proximity means that the molecule never oxidises to a fully charged species but stops at the paramagnetic species •7+. That, says Barnes, is because the molecule is trying to minimise the charge in the centre where the two catenanes link. ‘The charged units have no choice but to interact with one another,’ explains Barnes, so it holds on to that remaining electron to reduce the charge repulsion.

But while the •7+ species is paramagnetic, all the other charged species are diamagnetic, as the electrons spins pair. Using cyclic voltammetry it is possible to quickly switch between the paramagnetic and diamagnetic states by adding and removing electrons. And it is this simple switching that could be the key to a potential application of the material: memory storage.

DOI: 10.1126/science.1228429

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