Showing papers by "Jacques E. Guerchais published in 1971"

Composés de coordination de molécules soufrées. II. Complexes pseudo-tétraédriques et plan du nickel(II) avec quelques dithiole-1,2 thiones-3

Abstract: The study of the far infrared spectral region permits one to distinguish between the pseudo-tetrahedral complexes NiI2L2 (L = R1R2C3S3 where R1 = CH3 and R2 = H, R1 = R2 = CH3, R1 = C4H3S and R2 = H) and the square planar complex NiI2L′2 (L′ = R1R2C3S3 where R1 = C6H5 and R2 = H). The electronic spectra recorded in the solid state confirm the distinction. The displacement of the band νC=S of the molecule 1,2-dithio-1-3-thione which enters the sphere of coordination is more marked in the complexes of cobalt(II) than in the corresponding nickel(II) complexes.

Peroxo-complexes: triperoxovanadates(V) complexes

Abstract: Triperoxovanadates of the type MI[V(O–O)3(AA)],nH2O and MI3[V(O–O)3(AA)′],H2O [M1= NH4, K or Na;(AA)= phen or bipy; (AA)′= C2O4(phen = 1,10-phenanthroline, bipy = 2,2′-bipyridyl)] have been prepared by reaction of the ligands with solutions of metavanadates in hydrogen peroxide. The molar conductivities of these salts in aqueous solution show the presence of 1 : 1 and 3 : 1 electrolytes. The existence, splitting, and shift of some i.r. bands including, in the 550–650 cm–1 region, bands assigned to the [graphic omitted] group show that the peroxophen, bipy and oxalato-groups are co-ordinated as bidentate ligands. U.v. spectra, magnetic susceptibilities, and an X-ray analysis are also reported. These complexes, in which the vanadium is probably eight-co-ordinate, are compared with the corresponding niobium and tantalum derivatives.