SYNTHETIC, STRUCTURAL AND BIOCHEMICAL-STUDIES OF BINUCLEAR COMPLEXES DERIVED FROM HETEROCYCLIC AZOMETHINES

Reactions of equimolar amounts of phenylarsonic acid with tri(isopropo xy)borane result in the formation of [GRAPHICS] type derivatives. The substitution reactions of monoisopropoxy derivatives with azomethines yield the chelated binuclear derivatives in the form of monomeric soli ds having sharp melting points. These have been characterized by eleme ntal analyses, molecular weight determinations and conductance measure ments. On the basis of IR, H-1, B-11 and C-13 NMR spectral studies, a tetracoordinated environment around the boron atom may be assigned to these oxo-bridged compounds. The tetracoordinated sites are filled by the two oxo-oxygens of phenylarsonic acid, one azomethine nitrogen and an oxygen or sulfur of the semi- or thiosemicarbazone moiety.