1. Edita Bjelic, Tehnološki fakultet, Univerzitet u Tuzli,
Federation of Bosnia and Herzegovina
, Bosnia and Herzegovina
2. Mersiha Suljkanovic, Prirodno-matematički fakultet, Univerzitet u Tuzli, Federation of Bosnia and Herzegovina , Bosnia and Herzegovina
3. Jasmin Suljagic, Tehnološki fakultet, Univerzitet u Tuzli, Federation of Bosnia and Herzegovina , Bosnia and Herzegovina
Application of surfactants as carriers for metal cations and their influence on complexation between metal cations and cyclic polyethers has become the subject of many investigations. Surface active agents find wide applications in different analytical procedures due to their amphiphilic properties and the possibility of micellar aggregation. In this paper effects of surfactant structure (Triton X-100 and Triton X-45) on the conductivity of Pb(II) complex with 18-crown-6 ether has been investigated. The results showed that nonionic surfactants with oxygen atoms in the hydrophilic segment of their molecules showed electron-donor properties during interactions with metal ions. The influence of the surfactant structure confirms, that the length of the polyether chain affects the metal-surfactant interactions. Triton X-100 with a higher number of oxygen atoms in the surfactant structure (longer oxyethylene chain), compared to Triton X-45, affected the higher absolute values of the conductivity of systems, but not the change in the stoichiometric ratio between a metal ion and macrocyclic ligand. The results also showed that the addition of a nonionic surfactants lead to a better-defined stoichiometry of the Pb(II) complex in dichloromethane, significantly contributed to its stability and the absolute conductivity values increased. The effect of surfactant on the complexation of Pb(II) ions in the aqueous medium is opposite and lower conductivity values were measured.