Reversible release or reabsorption of water like sponges, a process which is accompanied by a dramatic change of structure and magnetic properties, can be achieved by some molecular magnetic materials. When the sponges are hydrated, or wet, the structure consists of isolated units with a nonmagnetic ground state. When the sponges are dehydrated, or dry, the units are linked to each other, affording polymeric molecule-based magnets (see picture).
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Kahn et al. (1999) studied this question.
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