Cool stuff: The usage of phosphonates has led to formation of a family of 3d–4f heterometallic cages with a Wells–Dawson-like structure (see picture; Gd, Dy, or Y purple; Ni cyan; P green; O orange; C gray). Magnetic studies show ferromagnetic interactions within the oxo-centered nickel triangle and huge entropy change in the Gd analogue, which, in principle, can be used as an ultralow-temperature coolant.
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Zheng et al. (2011) studied this question.
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