Mössbauer and infrared spectroscopic studies of some organotin(IV) schiff base complexes

Several organotin(IV) complexes with quadri- and terdentate anionic Schiff base ligands have been investigated in the solid state using ¹¹⁹Sn Mössbauer and IR spectroscopies, Mössbauer parameters derived from both zero-field and magnetically perturbed spectra suggest that the R₂Sn(Salen)(R = Me, Et, Ph) and Me₂Sn(Saldap-2OH) complexes have similarly distorted trans-octahedral structures. However, in Ph₂Sn(HSaldap-2-O) the ligand appears to be only terdentate, leading to a penta-coordinate structure similar to those of the R₂Sn(Sal-N-2-OC₆H₄) derivatives (R = Me, Ph). For Ph₃Sn(Sal-N-2-OC₆H₄) the asymmetry parameter of the electric field gradient is close to unity, confirming a mer-octahedral configuration for this complex.