Interaction of thorium(IV) and dioxouranium(VI) with histidine, cysteine and guanosine-binary and ternary complexes in solution

Interaction of thorium(IV) and dioxouranium(VI) with guanosine and aminoacids, viz., histidine and cysteine in a 1 :1 and 1:1:1 ratios has been investigated at 35 degrees C. Stabilities of various systems are evaluated by computer program. The pH profile of various species have also been generated in order to identify the stable species at biological pH. The results suggest involvement of N(7) in guanosine, ring nitrogen and thio group in histidine and cysteine respectively along with carboxylate group in metal coordination.