A dramatic variation of the magnetic coupling in large polyiron clusters can be induced by exploiting host−guest interactions. Subtle structural changes and much weaker antiferromagnetic interactions are the result of the substitution of Na+ with Li+ in the hollow core of the cyclic complex [Fe6(OCH3)12(dbm)6] (Hdbm = dibenzoylmethane).
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Abbati et al. (1997) studied this question.
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