Some complexes of tin(II) and tin(IV) with ono-type dihydroxy Schiff bases

Coordination compounds of Sn(IV) with four ONO-type Schiff bases, namely, N -(2-hydroxyphenyl)salicylaldimine (I), N-(2-hydroxy-5-methylphenyl)salicyla ldimine (II), N-(2-hydroxy-5-chlorophenyl)salicylaldimine (III) and N-(2-hy droxy-4-methylphenyl)salicylaldimine (IV) have been studied. IR spectroscop y in addition to thermogravimetric and elemental analyses have been perform ed. The molecular structure of the Sn(IV) complex of (IV) as a model struct ure was solved by X-ray diffraction technique. It is observed that, Sn(II) in the Sn(II) complexes is oxidized in atmospheric oxygen and Sn(IV) comple xes are formed in polar solvents such as dioxane, acetonitrile and dimethyl sulphoxide.