Four bimetallic chiral magnetic materials derived from octacyanometalate and cyclohexanediamine

Abstract

The coexistence of chirality and magnetism in one material can lead to many fascinating phenomena. Therefore, four new two-dimensional cyanobridged coordination polymers, [Cu(trans-(1R,2R)-chxn)2]3[WV(CN)8]2·2DMF (1), [Cu(trans-(1S,2S)-chxn)2]3[WV(CN)8]2·2DMF (2), [Cu(trans-(1R,2R)-chxn)2]3[MoV(CN)8]2·2DMF (3) and [Cu(trans-(1S,2S)-chxn)2]3[MoV(CN)8]2·2DMF (4), have been synthesized by using chiral ligands of cyclohexane-(1R,2R)-diamine and cyclohexane-(1S,2S)-diamine as the source of chirality and octacyanometalate ([MoV(CN)8]3− and [WV(CN)8]3−) as bridges, Complexes 1–4 all show two-dimensional layer structures with the topology of (123)2(12)3. The four complexes are chiral, as evidenced by circular dichroism measurements. The magnetic behaviours of complexes 1–4 indicate very weak antiferromagnetic interaction is operative between Cu(II) ions and W(V) ions or Mo(V) ions through the weak coordination bonds of cyano bridges.