Synthesis, X-ray structure, spectroscopy and magnetism of polymeric bis(mu-dicyanamido)(mu-pyrimidine)copper(II) monoacetonitrile; a 3D compound withbridging 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) toget her with its spectroscopic and magnetic properties. The 3D structure is bui lt from independent chains in three directions using bridging pm ligands [C u-Cu distance of 5.828(1) Angstrom] and bridging A ligands [Cu-Cu distance of 7.841(1) Angstrom]. The centrosymmetric CuN6 chromophore is an axially e longated octahedron which has Cu-N distances varying from 1.983(2) to 2.404 (2) Angstrom. The holes in the lattice are filled with acetonitrile molecul es. No significant magnetic coupling between the Cu(II) ions is observed do wn to 5 K. (C) 2001 Elsevier Science B.V. All rights reserved.