Study of catechol derivatives of thorium

Agarwal, R. P. ; Mehrotra, R. C. (1962) Study of catechol derivatives of thorium Journal of Inorganic and Nuclear Chemistry, 24 (7). pp. 821-827. ISSN 0022-1902

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Complexing reactions of thorium with catechol have been studied by potentiometric and preparative methods. In acidic solution the formation of the mono-catechollate derivative only was indicated even in the presence of a large excess of catechol. The equilibrium constant K of the reaction: Th4+ + C6H4(OH)2 ⇓ [Th(C6H4O2)]2+ + 2H+ was found to be: K = 2.98 × 10-5 and the formation constant k of the complex was 5.25 × 1017. Potentiometric titrations of thorium nitrate in presence of catechol showed a sharp inflexion at four equivalents of alkali per mole of thorium ion, suggesting the possibility of an electrometric estimation method for thorium. New compounds (NH4)2-[Th(C6H4O2)3] C6H6O2 and (C5H5N)2Th(C6H6O2) 2 were isolated.

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ID Code:30178
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