Abstract:
The temperature-jump relaxation method has been used to measure the activation parameters
for the formation and dissociation of the 1 : 1 complexes between magnesium and manganese(Il)
and 8-hydroxyquinoline (oxine) and of the ternary complexes between oxine and the magnesium
and mangancse(II) complexes of nitrilotriacetate, uramil-NN-diacctate, adcnosine-5'-diphosphatc,
adcnosinc-5 -triphosphate and polytriphosphatc. The results strengthen the previous conclusion
that the first ligand has comparatively little influence on the kinetics of the reaction of magnesium
with a second ligand,whereas manganese(II) shows similarities to zinc in the reactivity of its complexes.
I he enzymatic behaviour of magnesium and mangancsc(ll) is discussed in the light of these results.
