Synthesis, crystal structures and magnetic properties of two three-dimensional heterotrimetallic compounds [Cu(en)2Li(H2O)][Fe(CN)6] and [Cu(en)2Li(H2O)][Co(CN)6] (en = ethylenediamine)

Two heterotrimetallic compounds, [Cu(en)2Li(H2O)][Fe(CN)6] and [Cu(en)2Li(H2O)][Co(CN)6] (en = ethylenediamine), were synthesized and characterized. They are isostructural and crystallize in the orthorhombic space group Pbca at 293 K. The structures of the two compounds are composed of one-dimensional zigzag Fe/Co–C≡N–Cu chains linked by Li(I) ions into three-dimensional frameworks. Magnetic study of [Cu(en)2Li(H2O)][Fe(CN)6] reveals a weak magnetic interaction in the compound.

Graphical AbstractTwo heterotrimetallic compounds, [Cu(en)2Li(H2O)][Fe(CN)6] and [Cu(en)2Li(H2O)][Co(CN)6] (en = ethylenediamine), were synthesized and characterized. They are isostructural and crystallize in the orthorhombic space group Pbca at 293 K. The structures of the two compounds are composed of one-dimensional zigzag Fe/Co−C≡N−Cu chains linked by Li(I) ions into three-dimensional frameworks. Magnetic study of [Cu(en)2Li(H2O)][Fe(CN)6] reveals a weak magnetic interaction in the compound.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights► Heterotrimetallic compounds [Cu(en)2Li(H2O)][M(CN)6] (M = Fe(III) or Co(III); en = ethylenediamine) are composed of one-dimensional zigzag M − C ≡ N − Cu chains linked by Li(I) ions into three-dimensional frameworks. ► Magnetic measurements of [Cu(en)2Li(H2O)][Fe(CN)6] reveal a weak magnetic interaction. ► This study shows the possibility of using a third diamagnetic metal ion to control structures and magnetic properties of Cu(II)-Fe(III)-cyanide compounds.