110019-20-0Relevant articles and documents
Ion Pairing in the Analysis of Voltammetric Data at the ITIES: RbTPB and RbTPBCl in 1,2-dichloroethane
Kontturi, A. K.,Kontturi, K.,Manzanares, J. A.,Mafe, S.,Murtomaeki, L.
, p. 1131 - 1136 (2007/10/02)
The association of rubidium-tetraphenylborate (RbTPB) and rubidium-tetrakis(chlorophenyl)borate (RbTPBCl) ion pairs in the organic solvent 1,2-dichloroethane (DCE) have been obtained from conductivity and voltammetric data.Conductivity measurements given KRbTPBCl = 43 100 M-1 and yield a lower bound for KRbTPB (KRbTPB > 70 000 M-1).The latter association constant is at variance with the previously accepted value.A method for analysing voltammetric data which allows for the determination of the association constants is presented.The positive polarization limit where the transfer of Rb+ takes place is shifted by ca. 200 mV when changing the anion of the organic base electrolyte from TPB- to TPBCl-.If we interpret this shift in terms of the association constant, then KRbTPB = 7.4*107 M-1.The values of KRbTPB and KRbTPBCl are discussed in terms of the classical theories by Bjerrum and Fuoss.Finally, we consider if the preferential solvation of p-chlorophenyl rings of TBBCl- could account for the observed difference between the values of the association constants. - Keywords: Electrochemistry / Interfaces / Ion Pairing / ITIES / Solutions
