Comparative study of the chelation reaction of N-benzoyl-N-phenylhydroxylamine with tin(II) and tin(IV)

Abstract

A comparative study by elemental analysis, differential scanning thermal analysis, X-ray photoelectron spectrometry, ¹H NMR spectrometry and infrared spectrometry revealed that the product of reaction of N-benzoyl-N-phenylhydroxylamine (BPHA) with Sn^II is identical with that with Sn^IV and that BPHA acts merely as a chelating ligand, neither oxidizing Sn^II nor reducing Sn^IV. A reaction mechanism is proposed. The use of BPHA in a large excess facilitates the dissociation of anionic chlorocomplexes of Sn to the active species SnCl₂²⁺ on the one hand, and shifts the redox equilibrium of Sn^II–Sn^IV on the other, favouring the Sn^IV state.