Synthesis and crystal structure of a novel sheet-like heteronuclear complex, [Cu2(oxen)Fe(CN)5(NO)]n, H2oxen = N,N´-bis(2-aminoethyl)oxamide

One novel Cu(II)-Fe(III) heteronuclear complex [Cu₂(oxen)Fe(CN)₅(NO)]_n (H₂oxen = N,N´-bis(2-aminoethyl)oxamide) was synthesized by the reaction of Cu(oxen)·₂H₂O with Cu(ClO₄)₂·6H₂O and Na₂[Fe(CN)₅NO]·2H₂O. The crystal structure was determined by single-crystal X-ray diffraction. The complex crystallizes orthorhombic with space group Pnma, and forms a centrosymmetric Cu(II)-Fe(III) heteronuclear molecule in which an oxamido group in the trans conformation bridges two crystallographically equivalent copper(II) ions with the Cu⋯Cu separation of 5.284(2) Å. Fe atom is in a slightly distorted octahedral environment. The title complex is assembled into a novel 2D sheet-like heteronuclear polymer bridged by oxamido and cyano.