New Possibilities of Application of Cobalt Bis(dicarbollide) Anion as a Lipophilic Additive in Ion-Selective Electrode Membranes
a Department of Analytical Chemistry, Institute of Chemical Technology, Prague, bInstitute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, Prague
Selectivity and sensitivity of PVC membrane electrodes are dramatically influenced not only by a specific receptor but also, especially for neutral ionophores, by additional lipophilic coreceptor. We describe novel systems based on classic cation receptors and a highly lipophilic cobalt bis(1,2-dicarbollide), a bulky, weakly coordinating anion with delocalized charge. The function of the novel coreceptor is demonstrated by the use of dibenzo-18-crown-6 or dicyclohexano-18-crown-6 as ionophore in combination with a classic lipophilic additive and a cobalt bis(dicarbollide). The obtained data show its higher efficiency, which makes this coreceptor suitable for cation detection and development of novel sensors.
Full text (PDF)