Boron complexes of monofunctional bidentate and bifunctional tridentate Schiff bases

Boron Schiff base complexes of the type (AcO)2 B(SB) and (AcO)2 B(SBH) [where SB- and SBH- represent the anions of monofunctional bidentate and bifunctional tridentate Schiff bases having the donor systems N-OH and HO-N-OH respectively] have been synthesized by the interaction of boric acid with the Schiff bases in acetic anhydride medium. Schiff bases having a functional OH group ortho to the azomethine (> C=N) group such as o-HOC6H4C(CH3): NR [where R = -n-C3H7, -iso-C3H7, -n-C4H9, -sec-C4H9, -t-C4H9 and -C6H5] and o-HOC6H4C(CH3): NXOH [where X = -CH2CH2-, -CH2CHCH3 and C2H5CHCH2-] have been found to react with boric acid only equimolarly regardless of the stoichiometry of the reactants. All the complexes have been synthesized almost in quantitative yields and characterized by their molar conductance and molecular weight determination in dimethyl-formamide and boiling chloroform respectively. Their infrared spectra have also been recorded. (author)