Cool cages! The use of phosphonates has led to formation of a family of manganese(II)–lanthanide(III) heterometallic cages with structurally beautiful cores (see figure). Magnetic studies show antiferromagnetic interactions within the manganese centers and huge entropy change in the {Mn4Gd6} complex, which, in principle, can be used for ultralow temperature cooling.
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Zheng et al. (2012) studied this question.
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