Mécanisme d'apparition de la coloration jaunâtre dans les poudres de sulfate stanneux

A spectrophotometric study of stannous sulphate powders has enabled the mechanism of the yellow coloration of these powders to be defined. It is shown that the yellow coloration results from the formation of charge transfer complexes of the type 1Sn(II)-4Sn(IV) in a film of adsorbed and acidified wa...

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Bibliographic Details
Published in:Canadian journal of chemistry 1977-10, Vol.55 (19), p.3425-3428
Main Author: Verville, G
Format: Article
Language:English
Online Access:Get full text
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Summary:A spectrophotometric study of stannous sulphate powders has enabled the mechanism of the yellow coloration of these powders to be defined. It is shown that the yellow coloration results from the formation of charge transfer complexes of the type 1Sn(II)-4Sn(IV) in a film of adsorbed and acidified water which surrounds some stannous sulphate particles. The charge transfer complexes are formed by the adsorption of Sn 2+ *xH 2 O or SnHSO 4 + ions onto the surface of colloidal Sn(OH) 4 *xH 2 O that is formed by the oxidation and hydrolysis of the stannous sulphate.
ISSN:0008-4042
1480-3291
DOI:10.1139/v77-480