Spin Crossover in a Trinuclear Iron II Complex

Thermal ST occurs in the trinuclear iron(II) complex [Fe3(iptrz)6(H20)6](Trifl)6 (with iptrz = 4-isopropyl-1,2,4-triazole and Trifl = trifluoromethanesulfonate) only at the 

Lowering temperature to 200 K, the thermally induced ST at the central Fe(ll) site sets in with the appearance of two new doublets in the Mossbauer spectrum (1) the poorly resolved doublet termed LS refers to central Fe(ll) sites now being in the LS state, and (2) the doublet termed arises from the outer Fe(ll) sites of 

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