Cx. He et N. Zhou, COMPARATIVE-STUDY OF THE CHELATION REACTION OF N-BENZOYL-N-PHENYLHYDROXYLAMINE WITH TIN(II) AND TIN(IV), Analyst, 119(10), 1994, pp. 2247-2250
A comparative study by elemental analysis, differential scanning therm
al analysis, X-ray photoelectron spectrometry, H-1 NMR spectrometry an
d infrared spectrometry revealed that the product of reaction of N-ben
zoyl-N-phenylhydroxylamine (BPHA) with Sn-II is identical with that wi
th Sn-IV and that BPHA acts merely as a chelating ligand, neither oxid
izing 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, a
nd shifts the redox equilibrium of Sn-II-Sn-IV on the other, favouring
the Sn-IV state.