Far-infrared spectra of bis(pyrazine) complexes of transition metal(II) halides. The crystal and molecular structure of dichlorobis(pyrazine)cobalt(II)

Abstract

Single crystal X-ray diffraction studies on CoCl₂(pyrazine)₂ confirm far-i.r. spectroscopic evidence that in MX₂(pyrazine)₂[M = Co or Ni; X = Cl, Br, or I] the halogen atoms occupy terminal positions whereas the pyrazine groups are bridging, forming a sheet structure containing six-co-ordinate cobalt atoms.