Guest-, Light- and Thermally-Modulated Spin Crossover in [FeII2] Supramolecular Helicates

A new bis(pyrazolylpyridine) ligand (H2L) has been prepared to form functional [Fe2(H2L)3]4+ metallohelicates. Changes to the synthesis yield six derivatives, X@[Fe2(H2L)3]X(PF6)2⋅xCH3OH (1, x=5.7 and X=Cl; 2, x=4 and X=Br), X@[Fe2(H2L)3]X(PF6)2⋅yCH3OH⋅H2O (1 a, y=3 and X=Cl; 2 a, y=1 and X=Br) and...

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