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Stairway to heaven: An Mn2Nb coordination framework shows huge switching of the magnetic ordering temperature in two well-defined steps, finally reaching 100 K in its anhydrous form. The switching, controlled by removal/uptake of guest molecules, is related to an intraskeletal molecular rearrangement involving reversible formation/breaking of molecular bridges and translocation of an organic ligand on dehydration (see picture; VAC=vacuum).
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Pinkowicz et al. (2011) studied this question.
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