Construction of an unusual three-dimensional transition metal lanthanide Ln/Cu(Br/Cl) coordination polymer with isonicotinate as the single ligand

A 3d–4f heterometallic coordination polymer, {[Cu10Er4(IN)14ClBr7(H2O)10] · 2H2O}n (1) [IN = isonicotinate], has been synthesized by hydrothermal reaction of the ligand with CuBr2, NaCl and Er2O3. Complex 1 represents a rare 3D heterometallic coordination framework constructed from Er-carboxylate subunits and unique Cu-halide (Br/Cl) chains that are bridged by a single type of linear ligand. Furthermore, the luminescent properties of complex 1 have also been investigated.