Abstract
Stability constants of transition-metal chelates of 1,3-disubstituted 5-hydroximino-hexahydropyrimidine-2,4,6-trione [diphenyl violuric acid (DPhVA) and di-o-,m-, andp-tolyl violuric acid (DiToVA)] have been determined in 75% dioxane (aqueous) at 30±1°C, in solutions containing an excess of the ligand at ionic strength 0.1M-NaClO4. The order of formation constants found is: $$UO_2 > Cu > Ni \geqslant Fe > Co > Pb > Zn > Cd > Mn.$$ The stability influencing effects of donor π-bond (metal to ligand) has been demonstrated. The effects of electrophilic and nucleophilic centres within the ligand have been correlated to stability constants and acid dissociation constants.
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