Synthesis, X-ray structure, spectroscopy and magnetism of polymeric bis(μ-dicyanamido)(μ-pyrimidine)copper(II) monoacetonitrile; a 3D compound with bridging dicyanamide anions in two dimensions

A new 3D structure is reported with bridging ligands and anions of formula [Cu(pm)(A)2]n(CH3CN)n (where pm=pyrimidine, A=dicyanamide) together with its spectroscopic and magnetic properties. The 3D structure is built from independent chains in three directions using bridging pm ligands [CuCu distance of 5.828(1) Å] and bridging A ligands [CuCu distance of 7.841(1) Å]. The centrosymmetric CuN6 chromophore is an axially elongated octahedron which has CuN distances varying from 1.983(2) to 2.404(2) Å. The holes in the lattice are filled with acetonitrile molecules. No significant magnetic coupling between the Cu(II) ions is observed down to 5 K.