On the composition of ternary complexes of titanium, hydrogen peroxide, 8-hydroxyquinoline

Abstract

8-Hydroxyquinoline reacts with Ti(IV) in the presence of excess hydrogen peroxide to form a ternary complex of yellow coloration. The ternary complex is extracted into chloroform and it shows a molar extinction coefficient, ε= 7, 300 at 425 nm at maximum absorption. This molar extinction coefficient is much larger than that of the complexes between Ti(IV) and 8-hydroxyquinoline or hydrogen peroxide. The composition of the ternary complex extracted is confirmed to be Ti(H₂O₂)(Oxine)₂ by a solvent extraction method. Under the optimum conditions, Beer's law is obeyed for 9 to 40μg of Ti(IV) in 10 ml of chloroform.