Spin crossover FeII complexes as templates for bimetallic oxalate-based 3D magnets

We present the synthesis and structural characterization of the salt [Fe(bpp)2][MnCr(ox)3]2 · bpp · CH3OH. It crystallizes in the monoclinic space group. This material contains an anionic [MnCr(ox)3]− 3D 10-gon ferromagnetic network, that orders below 3.0 K. The channels created by this architecture are filled by the spin crossover cations [Fe(bpp)2]2+ (bpp = 2,6(bispyrazol-3-yl)pyridine), free ligand and solvent molecules. No spin transition has been observed at ambient pressure.This work was supported by the European Union (Network of Excellence: MAGMANET). Financial support from the Ministerio de Educación y Ciencia (Projects MAT2004-3849 and BQU2002-01091), and from the Generalitat Valenciana (GV04A/77) is also acknowledged.S