A series of unusual three-dimensional 3d–4f (Ln/Cu/Cl/Br) cyanide heterometallic coordination polymers: Synthesis, crystal structure and magnetic properties

•Three 3D Ln–Cu heterometallic coordination polymers (HCPs) have been synthesized.•Being an extremely rare example, glycolic acid (ga) was used as auxiliary ligand.•All ga ligands are deprotonated to adopt a μ3-kO:kO,O′:kO′,O″ coordination mode.•Copper–cyanide-system has been successfully incorporated as Cu-inorganic motifs.•HCP 1 shows antiferromagnetic behaviors.

A series of unusual three-dimensional (3D) 3d–4f cyanide heterometallic coordination polymers (HCPs), namely [Ln1.5Cu3(ina)3(ga)(CN)1.5(X)(H2O)] [Ln = Dy, X = Cl (1), Ln = Tb, X = Br (2), Ln = Dy, X = Br (3); ina = isonicotinic acid; ga = glycolic acid] have been synthesized via hydrothermal reaction and characterized by single crystal X-ray diffraction, elemental analyses, FT–IR spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). X-ray structural analysis reveals that HCPs 1 to 3 are constructed from the linkage between Ln–organic layer motifs and double-stranded cyano-containing Cu-inorganic ribbon motifs. In these complexes, the carboxyl group and hydroxyl group of H2ga are all deprotonated and the coordinated ga ligands adopt a very interesting μ3-kO:kO,O′:kO′,O″ coordination mode. Moreover, magnetic properties of HCP 1 were investigated.

Graphical abstractThe linkage between Dy-organic layer motifs and double-stranded cyano-containing Cu-inorganic ribbon motifs gives the 3-dimensional heterometallic coordination polymers.Figure optionsDownload full-size imageDownload as PowerPoint slide