ON THE INTERACTION BETWEEN AZIDE AND MANGANESE IONS AT SEVERAL OXIDATION STATES

The interaction between azide and manganese ions, at several oxidation states (II, III, IV, V, VI and VII), has been investigated in aqueous medium at 25.0 ± 0.1°C and ionic strength 2.0 mol · L−1(NaClO4). Spectral data were obtained from absorbance measurements in order to calculate the molar absorptivity. The molar absorptivity values calculated, at 430 nm, for [Mn(N3)3],[Mn(N3)4]− and [Mn(N3)5]−2 were 230, 3,700 and 6,600 mol−1 · L · cm−1, respectively. Mn(IV) and Mn(V) are not stable in azide aqueous solution medium and spectral characteristics are similar to Mn(III)/N3− complexes. Additions of permanganate or manganese(VI) solution, as K2 MnO4, to several azide buffers solutions, N3−/HN3, have produced species which have shown similar spectral characteristics with at 438 nm.

[1]  N. Coichev,et al.  The stabilization of managese(III) by azide ions in aqueous solution. , 1997, Talanta.

[2]  R. Eldik,et al.  The synergistic effect of manganese (II) in the sulfite-induced autoxidation of metal ions and complexes in aqueous solution , 1992 .

[3]  Arthur I. Vogel,et al.  Vogel's Textbook of Quantitative Chemical Analysis , 1989 .

[4]  A. Bard,et al.  Standard Potentials in Aqueous Solution , 1985 .

[5]  E. de Oliveira,et al.  Spectrophotometric study of the equilibria in aqueous copper(II) azide solutions. , 1980, Talanta.

[6]  J. Mee.  The synergistic effect , 1965 .

[7]  P. Senise.  Spot test for sulfites based on the induced oxidation of cobalt-azide solutions , 1957 .

[8]  N. Coichev,et al.  Study of complex formation in the manganese(II)/azide system. , 1996, Talanta.

[9]  D. Klockow,et al.  The sulfur(IV)–cobalt(II)–azide system and its application to the investigation of the decomposition of sulfur hexafluoride under electrical discharges , 1994 .

[10]  D. Klockow,et al.  Autoxidation of cobalt(II) in azide containing medium in presence of sulfur (IV): an interpretative study , 1989 .

[11]  D. Klockow,et al.  Evaluation of the sulfur(IV) catalyzed autoxidation of cobalt(II) in an azide containing medium as a means for the determination of sulfite in precipitation , 1988 .

[12]  I. Gutz,et al.  Spectrophotometric and potentiometric study of the cobalt(II)-thiocyanate system in aqueous medium , 1985 .

[13]  Geoffrey Davies,et al.  Kinetics and stoichiometry of the reaction between manganese(III) and hydrogen peroxide in acid perchlorate solution , 1968 .