Synthesis, structure and properties of a fumarate bridged Ni(II) coordination polymer

A 1-D coordination polymer catena[μ-fumaratobis(4-cyanopyridine)diaquanickel(II)],[Ni(μ-C4H2O4)(4-CNpy)2(H2O)2]n 1 has been synthesized and structurally characterized. Compound 1 is monoclinic, P21/c with unit cell parameters a = 8.8759(9) Å, b = 11.4112(11) Å, c = 8.8908(9) Å, β = 106.010(6)°, V = 865.6(1) Å3, Z = 2 and Dcalc. = 1.600 g cm−3. The structure refined to R1 = 0.0245, wR2 = 0.0626 for all 2014 unique reflections and 152 parameters; GooF = 1.056. It consists of a polymeric chain of nearly octahedral Ni2+ centers bridged by bidentate fumarato ligands. Non-covalent interactions lead these chains to aggregate into an interesting metallosupramolecular assembly. Indexed PXRD pattern, solid state UV–vis–NIR spectral data, thermogravimetric behavior and variable temperature magnetic susceptibility data on 1 are presented.