Vk. Manchanda et Pk. Mohapatra, EXTRACTION STUDIES OF AM(III) AND EU(III) WITH A TRIS-BIPYRIDYL MACROBICYCLIC LIGAND, Journal of inclusion phenomena and molecular recognition in chemistry, 15(2), 1993, pp. 121-130
Complexation of Am(III) with a tris-bipyridine cryptand (L) has been c
arried out in a nonaqueous medium (CH3CN-CHCl3). Subsequently the comp
lexation behaviour was investigated using the reverse extraction trace
r technique with dinonyl naphthalenesulphonic acid (HD) in toluene as
the organic phase and varying concentration of HCI (upto 2M) as the aq
ueous phase. Equilibrium is attained in the two-phase system at a rate
dependent on the hydrogen ion concentration in the aqueous phase. Whe
reas it takes only a few minutes to attain the equilibrium state at pH
6.0, a phase contact period of 50 days was insufficient if the acidit
y is greater than 0.4M, presumably due to the slow dissociation of the
cryptate formed. The large enhancement in the distribution ratio valu
e in the synergistic system with 1 M HCI as the aqueous phase under no
n-equilibrium conditions is employed for the analytical separation of
Am(III) from Eu(III).