Studies in Complex Formation of Metal Ions with Tropolones. Part III. Spectrophotometric Studies on Complexes of Molybdenum(VI), Thorium(IV), and Zirconium(IV) with α-Carboxy β-methyltropolone

A study of the composition of zirconium, thorium, and molybdenum complexes with α-carboxy-β-­methyltropolone at different pH values has bean made using Job's method of continued variations at different wave lengths. Both zirconium and molybdenum form 1 : 1 and 1:2 complexes, whereas thorium forms 1:1, 1:2, and 1:3 complexes with the above reagent with increasing  pH values.