Some water-soluble Schiff-base complexes of nickel(II): The role of water

Article abstract of DOI:10.1039/DT9850001451

Disodium nickelate(II), Na2, and disodium bisnickelate(II) have been prepared.Electronic spectra and magnetic susceptibility measurements show that in aqueous solution there is an equilibrium between the square-planar forms and six-co-ordinate species produced by co-ordination of two water molecules.Thermodinamic parameters are reported for the Na2 system.The room-temperature i.r. spectrum of solid (diamagnetic) Na2*2H2O gives two well resolved bands in the O-H stretching region.One of these is extremely sharp (bandwidth 16 cm^-1) and occurs at an unusually high frequency (3630 cm^-1).The i.r. spectra of samples having various extents of deuteriation show that the two water molecules are crystallographically equivalent, with C₁ site symmetry.In each H2O, one hydrogen atom is almost non-hydrogen-bonded while the other is involved in a hydrogen bond of moderate strength.

Full text of DOI:10.1039/DT9850001451

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