- Title
- A new approach to the equilibrium study of iron(III) thiocyanates which accounts for the kinetic instability of the complexes particularly observable under high thiocyanate concentrations
- Creator
- de Berg, Kevin; Maeder, Marcel; Clifford, Sarah
- Relation
- Inorganica Chimica Acta Vol. 445, p. 155-159
- Publisher Link
- http://dx.doi.org/10.1016/j.ica.2016.02.052
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2016
- Description
- The kinetic instability of iron(III) thiocyanate complexes in aqueous solution, evidenced by the loss of solution colour with time, has made it difficult to determine reliable equilibrium data. A technique, which measures the absorbance of these solutions as a function of time within milliseconds of mixing Fe3+ with SCN− and which extrapolates to an initial spectrum at time zero, has been designed to overcome these difficulties and is described in this paper. Two complexes, Fe(SCN)2+ and Fe(SCN)2+, have been identified upon analysing the absorbance data for thiocyanate concentrations up to 0.25 M at 25 °C and an ionic strength of 0.5 M. Equilibrium constants, K1 = (98 ± 1)/M-1 and K2 = (7 ± 1)M-1 have been determined and comparisons made with the literature.
- Subject
- iron thiocyanates; kinetic instability; initial spectrum; stability constants
- Identifier
- http://hdl.handle.net/1959.13/1347678
- Identifier
- uon:30096
- Identifier
- ISSN:0020-1693
- Language
- eng
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