Among the earliest investigations on yttrium S-hydroxyquinolinate were those by MANKELl.I1, who precipitated the complex from an aqueous solution of yttrium nitrate. Cravimetric and titrimetric procedures were suggested and it appeared that satisfactory recovery of yttrium as the S-hydroxyquinolinate could be obtained from solutions containing acetic acid and ammonia. JACICSON~ also carried out investigations into the precipitation of yttrium S-hydroxyquinolinate and concluded that there was no evidence for the existence of a stoichiometric complex. The concentration of reactants and the temperatures of precipitation were varied but results were still unsatisfactory. In x955, MURTHY et a1.3 also investigated the determination of yttrium with S-hydroxyquinoline.
These workers obtained satisfactory recovery of yttrium after precipitation from solutions containing acetic acid and ammonia in the 1)~ range s-6. The precipitate was dried at roof-for 4-8 11 and weighed as Y(C&IeNO)n. Bromometric titration confirmed the composition of the complex. The absorption spectra of this complex were also investigated in various organic solvents in the wavelength range, 300-400 nm. Limited conformity to Beer's Law was obtained in chloroform, acetone and carbon tetrachloride.
In 1956, WEND~ANDT~ carried out thermo@avimetric studies on yttrium Shydroxyquinolinate and concluded that the complex could be weighed as YQ3, where