Organotin derivatives of (arylazo)benzoic acids : I. Preparation,spectrophotometric titrations and IR spectra

Organotin derivatives of some (arylazo)benzoic acids have been prepared, and investigated by spectrophotometric titration and IR spectroscopy. The organotin (o-arylazo)benzoates are generally penta-coordinated, but those containing a hydroxyl group in the 2-position, e.g., triorganotin o-(2-hydroxy-5-methyl-benzeneazo)benzoate, are hexa-coordinated. The tetracarboxy derivatives contain two different types of tin—carboxylate bonds, as shown by two IR absorptions, at 1700 (ester-like) and 1620 cm^?1 (chelated).