Study of complex formation in the manganese(II)/azide system

The complex formation between Mn(II) cations and N 3 − anions was studied in aqueous medium at 25 °C and ionic strength 2.0 M (NaClO 4). Data of average ligand number, n¯ (Bjerrum's function), were obtained from pH measurements on the Mn(II)/N 3 −/HN 3 system followed by integration to obtain L...

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Bibliographic Details
Published in:Talanta (Oxford) 1996, Vol.43 (1), p.67-72
Main Authors: Moya, Horacio Dorigan, Neves, Eduardo Almeida, Vázquez^Suárez-Iha, Maria Encarnación, Coichev, Nina
Format: Article
Language:English
Subjects:
Azide
Chemistry
Complex formation
Coordination compounds
Exact sciences and technology
Inorganic chemistry and origins of life
Manganese
Preparations and properties
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Summary:The complex formation between Mn(II) cations and N 3 − anions was studied in aqueous medium at 25 °C and ionic strength 2.0 M (NaClO 4). Data of average ligand number, n¯ (Bjerrum's function), were obtained from pH measurements on the Mn(II)/N 3 −/HN 3 system followed by integration to obtain Leden's function, F 0(L). Graphical treatment of data and a matrix solution of simultaneous equations have given the following overall formation constants of mononuclear stepwise complexes: β 1=4.15±0.02 M −1, β 2=6.61±0.04 M −2, β 3=3.33±0.02 M −3, β 4=0.63±0.01 M −4. A linear plot of log K n vs. ( n−1) shows no change in the configuration during complex formation. Slow spontaneous oxidation of solutions to Mn(III) occurs when the N 3 − concentration is greater than 1.0 M.
ISSN:0039-9140
1873-3573
DOI:10.1016/0039-9140(95)01716-X