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Nature of the colour-forming species in peroxy titanium sulphate

Patel, CC and Mohan Kumar, MS (1960) Nature of the colour-forming species in peroxy titanium sulphate. In: Nature, 186 (4727). pp. 803-804.

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Official URL: http://www.nature.com/nature/journal/v186/n4727/ab...

Abstract

ALTHOUGH titanium is determined colorimetrically in aqueous sulphuric acid medium in presence of excess of hydrogen peroxide, the nature of the colour-forming species is not known definitely. Schwarz1 suggested that the colour was due to the peroxo-disulphato titanate anion [O 2Ti(SO4)2]2-. On the other hand, Jahr2 and later Gastinger3 considered that the colour of the compound was due to the peroxy titanyl cation [TiO2 aq.] 2+, and suggested the following equilibrium in solution: Schaeppi and Treadwell4 attributed the colour bo O2TiSO4 or [O2Ti(SO4)2]2-, whereas Babko and Volkova5 represented the coloured complex ion as [Ti(H 2O2)]4+. Mori, Shibata, Kyuno and Ito 6 regarded the coloured species as [TiO2 aq.]2+ or [Ti(OH)2 (H2O)(H2O2)] 2+, assuming the co-ordination number of titanium to be four. Thus, a variety of constitutions has been proposed to explain the colour-forming species of the titanium complex, based on the investigations carried out in dilute sulphuric acid medium, but the complex has not been isolated so far.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Nature Publishing Group.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Ms TV Yashodha
Date Deposited: 23 Jun 2010 05:42
Last Modified: 23 Jun 2010 05:42
URI: http://eprints.iisc.ac.in/id/eprint/28504

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