Take it to the limit: Monodisperse nanoparticles of the 3D coordination polymer [Fe(pyrazine){Ni(CN)4}] have been obtained in biopolymer chitosan beads matrix (see picture). These ultra-small nanoparticles (ca. 4 nm) exhibit spin crossover phenomenon with hysteresis.
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Larionova≠ et al. (2008) studied this question.
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