Cobalt(III) azide dimethylglyoximates with some sulfanilamide derivatives: Synthesis and crystal structures

Abstract

A number of new Co(III) dimethylglyoximates containing N-pyrimidinylsulfanilamides were obtained. These complexes of the general formula [Co(N3)(DH)2L] (I–V) (where DH is the dimethylglyoxime monoanion and L are N-pyrimidinylsulfanilamides NH2-C6H4-SO2-NH-R with different substituents R) are expected to have antibacterial properties. Their structures were examined by IR, electronic absorption, and NMR spectroscopy and X-ray diffraction. They were classified among cobalt(III) trans dioximates. In all the complexes obtained, the cobalt atom coordinates to four N atoms of two dimethylglyoxime residues. The octahedral environment of the metal atom is completed with the amino N atom of the neutral molecule L and the N atom of the azide anion. In the crystal structures, complexes I–V are united through intermolecular hydrogen bonds N-H…O, N-H…N, and O-H…O, in which the groups −NH2 and =NH of the ligand L and water molecules (for I, IV, and V) serve as proton donors.