Abstract
Transfer of Ba2+ ion facilitated by dibenzo-18-crown-6(DB18C6) has been studied at the nitrobenzene(NB)/water(W) interface by using cyclic voltammetry. When the concentration of Ba2+ in W(WCBa) is much higher than that of DB18C6 in NB(NBCDB18C6), the cyclic voltammograms reveal typical reversible wave of ion transfer caused by forming 1:1(metal to li and) complex in NB. When we NcBa_??_ NBcDB18C6, the dominant species carrying the current across the interface is 1:2(metal to ligand) complex. The stability of 1:1 and 1:2 complex in NB are log10K1=9.6 and log10K2=2.4, where K1=[ML]/[M][L] and K2=[ML2]/[ML][L] When NBcDB18C6<0.5mM, the distortion of the cyclic voltammograms due the 1:2 complex formation is small but becomes significant when NBcDB18C6>1mM.
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