Stability constants of some metal cation complexes of tetraphenyl p-tert-butylcalix[4]arene tetraketone in nitrobenzene saturated with water

摘要

From extraction experiments and γ-activity measurements, the exchange extraction constants corresponding to the general equilibrium M~(2+)(aq) +1·Sr~(2+)(nb)→←1·M~(2+)(nb)+Sr~(2+)(aq) taking place in the two-phase water-nitrobenzene system (M~(2+) = Ca~(2+), Ba~(2+), Cu~(2+), Zn~(2+), Cd~(2+), Pb~(2+), UO_2~(2+), Mn~(2+), Co~(2+), Ni~(2+); 1 = tetraphenyl p-tert-butylcalix[4]arene tetraketone; aq = aqueous phase, nb = nitrobenzene phase) were evaluated. Further, the stability constants of the 1·M~(2+) complexes in water-saturated nitrobenzene were calculated; they were found to increase in the cation order Ba~(2+), Mn~(2+)< Co~(2+)< Cu~(2+), Ni~(2+)