Structural and kinetic trans effects in cobalt(III) complexes with cobalt-sulfur bonds. The crystal structure of trans-Bis(ethylenediamine)imidazolesulfitocobalt(III) perchlorate dihydrate

Abstract

The crystal structure of the title compound, [Co(C₂N₂H₈)₂(C₃N₂H₄)(SO₃)] ClO₄,2H₂O has been determined by X-ray diffraction, using diffractometer data, at 295 K, and refined by full-matrix least squares to a residual of 0.071 for 3425 ?observed? reflections. Crystals are orthorhombic, Pcmn, a 15.822(9), b 11.924(6), c 9.261(2) Ǻ, Z 4. The imidazole and sulfite ligands are trans in the cation, which has m symmetry (Co-S 2.223(2); Co-N 2.008(4) Ǻ). <Co-N(en)> is 1.96₄Ǻ. The apparent thermal motion of the sulfite about the Co-S axis is very high. The internal internuclear distances are compared to the data reported for series of similar complexes in which trans effects are observed.