Potassium bis(3‐phenylbiuretato)cobaltate(III).2DMSO. The crystal structure of a spin triplet cobalt(III) complex, containing dimethyl sulfoxide

Abstract

AbstractThe structure of potassium bis(3‐phenylbiuratato)cobaltate(III), crystallizing with two molecules of dimethyl sulfoxide, KCo(HNCON(C6H5)CONH)2.2(CH3)2SO, was determined by X‐ray analysis. The crystals are monoclinic, space group P2/c, with unit cell dimensions a = 7.471 ± 0.014, b = 8.126 ± 0.017, c = 21.467 ± 0.036 Å, β = 95.29° ± 0.13, and two formula units per unit cell. 2286 reflections were measured with an automatic diffractometer. The structure was refined by full matrix least squares methods. For 1019 reflections with I > 1½ σ (I), R = 0.14; for 638 reflections with I > 3 σ (I), R = 0.10. The complex anion is situated on a twofold symmetry axis. The cobalt atom is in almost planar N4‐coordination, with CoN bonds of 1.83 and 1.84 Å. The two DMSO molecules are not coordinated with the cobalt atom, but they are incorporated in the lattice with their oxygen atoms coordinated with the potassium ions.