Determination of stannous chloride and stannic bromide speciation in concentrated Cl and Br media by cyclic voltammetry

Dajeong Kim, Jinho Chang

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Abstract

The speciation of Sn(IV)-Br and Sn(II)-Cl in concentrated Br and Cl media were investigated by cyclic voltammetry, which is the continuous study from the previously reported Sn(II)-Br speciation Park and Chang (2016) . We first determined the speciation of Sn(IV)-Br in concentrated Br acidic aqueous solutions with ionic strength of 6. SnBrj4 − j complexes with 1 ≤ j ≤ 5 and their corresponding fractional diagrams were determined based on their estimated stability constants, βjSn(IV) − Br. In acidic aqueous solutions where the concentration of Br was less than 2 M, both SnBr3 + and SnBr22 + were estimated to be the main Sn(IV)-Br species. Meanwhile, as the Br concentration increased > 2 M, the fraction of SnBr5 was significantly increased and became the main species among Sn(IV)-Br complexes. For the Sn(II)-Cl speciation, SnClk2 − k complexes with 1 ≤ k ≤ 7 were determined as the concentration of Cl increased to 6 M in acidic aqueous solutions. The fractional diagrams of SnClk2 − k complexes were obtained from the estimated βkSn(II) − Cl. Based on the fractions of Sn(II)-Cl species, SnCl+ was the main species as the concentration of Cl was less than 1 M. As the Cl concentration increased from 1 to 6 M, SnCl75 − became dominant among Sn(II)-Cl complexes. We tried to determine the speciation of Sn(IV)-Cl by cyclic voltammetry. However, the determination of Sn(IV)-Cl speciation was experimentally limited because of the potential inversion of electrochemical reduction between Sn(IV)-Cl/Sn(II)-Cl and Sn(II)-Cl/Sn.

Original languageEnglish
Pages (from-to)20-25
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume785
DOIs
StatePublished - 2017 Jan 15

Keywords

  • Concentrated Cl and Br- media
  • Cyclic voltammetry
  • Speciation
  • Stannic bromide complexes
  • Stannous and stannic chloride complexes

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