Crystal structures of hexa(N-methylurea)cobalt(II) sulfate and thiosulfate

Abstract

The crystal structures of the title compounds, [Co(C₂H₆N₂O)₆](SO₄)(1) and[Co(C₂H₆N₂O)₆](S₂O₃) (2), have been determined at 295 K by X-ray diffraction using diffractometer data and refined by least squares to residuals of 0.042 (1), 0.043 (2) [875 and 926 reflections with I > (3σ(I)]. Crystals are trigonal, R 3c, a 1.4890(1) nm, α 43.34(1)° (1); a 1.4760(3) nm, α 44.53(1)° (2), Z 2. The compounds are isostructural; the complex cation has 3 symmetry, Co-O, 209.6(2) (1), 209.9(2) pm (2); the geometry of the ligand is well defined and precise, but the anions, located at sites of symmetry 32, are disordered.     The cobalt environment is distorted from O_h symmetry, being compressed along the threefold axis.