A number of new niobium (V) - Schiff base complexes of the type Nb (SB) x (OPri) 5 - 2x and Nb(SB)2(SBH) (where SB2⊖ and SBH⊖ are anions of the Schiff bases and x =1 or 2) have been synthesised by the interaction of niobium pentaisopropoxide with the Schiff bases in different stoichiometric ratios. The molecular weight determinations and IR studies of a few derivatives have also been carried out.Scanty references are available in the literature regarding the Schiff base complexes of niobium (V) and tantalum (V) 1, 2 and such derivatives have been prepared from the corresponding metal chlorides and the Schiff bases. In a series of papers published earlier 3, 4, a more convenient method, for the synthesis of such derivatives, by the interaction of metal alkoxides with the Schiff bases in anhydrous benzene medium, has been reported. The present paper describes the synthesis of several new niobium (V) derivatives with the Schiff bases derived from the condensation of salicylaldehyde or o-hydroxyacetophenone with n-hydroxyalkylamines.
The reactions of a few bifunctional and tridentate Schiff bases with titanium‐(IV) and zirconium(IV) isopropoxides in equimolar and bimolar ratios are described. The resulting compounds have been obtained in almost quantitative yields and are of the general formulae M(SB)x(OPri)4−2X (where M = Ti or Zr; SB‐ = anion of the Schiff base SBH2 and x = 1 or 2). Their molecular weights have been determined ebullioscopically and IR spectra recorded.
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