Crystal and molecular structure of aquomethylbis(dimethylglyoximato)cobalt(III)

Abstract

Crystals of the title compound are orthorhombic, space group Pnma, with a= 13·182(12), b= 9·115(6), c= 12·132(7)Å, Z= 4. The structure was solved by the heavy-atom method and refined by full-matrix least-squares calculations to R 0·039 for 1070 independent reflexions collected on an automatic diffractometer. The molecule has C_s symmetry with distorted octahedral co-ordination around the cobalt atom; mean equatorial distances: Co–N 1·890(3)Å; axial lengths: Co–O(H₂O) 2·058(3), Co–C(sp³) 1·990(5)Å. The intramolecular hydrogen-bonded bridge [O ⋯ O 2·486(4)Å] is not symmetrical. Comparison of the Co–C(sp³) axial bond lengths in like complexes is made and shows that there is no clear evidence for a cis-influence with variation in equatorial ligand.