A spectroscopic study on the cobalt(II), nickel(II) and copper(II) complex salts and the mono- and di-sodium salts of sulphamide

Abstract

The sulphamide (H 2 Su) complex salts Co(HSu) 2 ·H 2 O, NiSu·MeOH·H 2 O and CuSu·MeOH were prepared from basic solutions. The cobalt complex has a pseudo-tetrahedral coordination with C 2 v symmetry; the nickel complex has presumably a polymeric constitution with one paramagnetic octahedral and one diamagnetic planar chromophore. The i.r. spectra (4000-60 cm −1 ) of the complexes are discussed by comparison with the spectra of H 2 Su, NaHSu, Na 2 Su and of rhodium(III)-and mercury(II)-Su complex salts reported in the literature. In Co(HSu) 2 ·H 2 O the coordination of the HSu − anion occurs only through its oxygen atoms. In NiSu·MeOH·H 2 O and CuSu·MeOH the coordination of the Su = anion involves both its oxygen and nitrogen atoms.