Synthesis and characterization of triorganotin(IV) complexes of 5-[(E)-2-(aryl)-1-diazenyl]-2-hydroxybenzoic acids. Crystal and molecular structures of a series of triphenyltin 5-[(E)-2-(aryl)-1-diazenyl]-2-hydroxybenzoates (aryl = phenyl, 2-methylphenyl, 3-methylphenyl and 4-methoxyphenyl)

The triphenyltin and tri-n-butyltin complexes of some 5-[(E)-2-(aryl)-1-dia zenyl]-2-hydroxybenzoic acids have been synthesized and characterized by H- 1-, C-13-, Sn-119-NMR, IR and Sn-119m Mossbauer spectroscopic techniques in combination with elemental analysis. The crystal structures of triphenylti n 5-[(E)-2-(aryl)-1-diazenyl]-2-hydroxybenzoates (aryl = phenyl, 2-methylph enyl, 3-methylphenyl and 4-methoxyphenyl) are reported. Both X-ray and Sn-1 19 Mossbauer data indicate that the triphenyltin complexes adopt a monomeri c distorted tetrahedral configuration with the carboxylate ligand coordinat ing in a monodentate mode. By contrast, Sn-119 Mossbauer spectroscopy shows that each tributyltin complex is polymeric and features a trans-trigonal b ipyramidal geometry with a planar SnBu3 unit and two apical carboxylate oxy gen atoms derived from bidentate bridging carboxylate ligands. This is a so lid-state effect, as both Sn-119-NMR and (1)J(C-13-Sn-119/117) coupling con stant data indicate tetrahedral geometries in solution for the triphenyl an d tri-n-butyl complexes. (C) 2001 Elsevier Science B.V. All rights reserved .