METAL-COMPLEXES AS LIGANDS - POLYNUCLEAR ALKALI-METAL COMPLEXES WITH NICKEL(II) CHELATES

Some nickel(II) complexes with O-N donor ligands (saliclaldoxime, glycine and beta-alanine) and having oxygen-bridges with polymeric structures, depolymerise under suitable conditions and break up into monomers. These monomers in situ, behave as a single and double faced bidentate oxygen donor Lewis bases, and combine with partially covalent bonded alkali metal cations, to form oxygen-bridged polynuclear complexes. The spectral and magnetic moment studies indicate that the polymerised nickel(II) ions are converted into tetrahedral ones in their alkali metal adducts. Nickel(II)-salicylaldoximate forms oxygen donor five-membered stable chelate ring with alkali metal ions.