Crystal and molecular structure of amminebis-(2,2′-bipyridyl)copper(II) tetrafluoroborate

Abstract

The crystal structure of the title compound has been determined by X-ray diffraction methods from three-dimensional counter data. The structure was solved by Patterson and Fourier methods and refined by least-squares to R 0·087 for 2894 independent reflections. The complex crystallises in the monoclinic unit cell, space-group P2₁/c, with dimensions a= 9·051, b= 13·493, c= 19·278 Å, β– 103° 20′, and Z= 4. The cation has C₂ symmetry and the environment about the copper atom is approximately trigonal bipyramidal. The trigonal plane is formed by a nitrogen atom from each bipyridyl ligand (Cu–N 2·09 Å, subtending an angle of 108° at Cu) and the ammonia molecule (Cu–NH₃ 2·05 Å). The remaining bipyridyl nitrogen atoms occupy the axial positions (Cu–N 1·97 Å) and the direction between these two nitrogen atoms lies 11·4° from the normal to the trigonal plane.