The influence of o-phenathroline coordination to zinc isobutylxanthate andzinc diisobutyldithiocarbamate on the inhibiting activity in squalane oxidation and on the electrochemical properties of the complexes

The effect of the coordination of o-phenanthroline to zinc diisobutylxantha te (Zn(xant)(2)) and zinc diisobutyldithiocarbamate (Zn(dtc)(2)) on their i nhibiting activity in the initiated oxidation of squalane C30H62 (S-q) with oxygen in a chlorobenzene solution at 75 degreesC was studied. In the abse nce of o-phenanthroline, Zn(xant)(2) and Zn(dtc)(2) retard the initiated ox idation of squalane, the former complex being more active. Additional coord ination of o-phenanthroline to Zn(xant)(2) leads to the loss of the inhibit ing activity by this complex and decreases the efficiency of Zn(dtc)(2) in the squalane oxidation process. The mechanism of the deactivating action of o-phenanthroline was proposed. The voltammetric parameters on a rotating g raphite electrode were determined for the initial chelates and their adduct s with o-phenanthroline.