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A bimetallic pentadecanuclear cyanido-bridged $\left \{Fe_{9}[W(CN)_{8}]_{6}(MeOH)_{24}\right \} \cdot xMeOH$ cluster of an $Fe^{II/III}–W^{IV/V}$ mixed valence nature, reveals a reversible single-crystal-to-single-crystal transformation, concomitant with metal-to-metal charge transfer between Fe and W ions. The dominance of $^{HS}Fe^{II}-NC-W^{V}$ units at a high temperature, and $^{HS}Fe^{III}-NC-W^{IV}$ units at a low temperature, leads to an unprecedented reversed thermal hysteresis loop in magnetic measurements.
affiliation:
Wydział Chemii : Zakład Krystalochemii i Krystalofizyki, Wydział Chemii : Zakład Chemii Nieorganicznej, Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego