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.