Some organometallic and ‘simple’ Schiff-base chelates of tin(IV)

Abstract

Organotin(IV) chelates with a quadridentate Schiff base of the type R₂Sn(salen)(R = Me or Ph) have been synthesised by use of the recently reported Tl₂(salen) complex. The n.m.r. spectra of the chelates suggest that the R groups are cis to each other with the salen ligand in the unusual twisted configuration. A number of tin(IV) Schiff-base complexes of the types SnCl₄,2(salH-N-p-MeC₆H₄); SnCl₄,(salenH₂); Sn(salen)Cl₂ and SnCl₃-(salH-N-(2-OC₆H₄), Et₃N are also described. I.r., ¹H n.m.r., and mass spectra and conductance measurements have been used where possible to suggest possible structures for the complexes.