E. Nakayama, Y. Sohrin, K. Isshiki
Aug 1, 1989
Citations
0
Influential Citations
4
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The effects of temperature on the extraction of zinc(II) and cadmium(II) complexes with 8-quinolinol (HQ) and 2-methyl-8-quinolinol (HR) into three different types of organic solvents whose boiling points are relatively high were studied. 1) In the case of 1,1,2,2-tetrachloroethane (TCE), the extraction equilibrium can be written as follows (except for that of zinc with 2-methyl-8-quinolinol):2M2++6HQ(o)+X−\ightleftarrowsM2Q3(HQ)3+(o)+X−(o)+3H+,where X− refers to various inorganic anions. An ion-pair of the binuclear complex (complex ion pair) dissociates into a complex cation and an inorganic anion in the organic phase. The distribution ratios decrease remarkably with an increase in temperature. 2) In the 1-octanol (S) extraction system, zinc and cadmium are extracted as solvent-adducts, such as MQ2·S2. The distribution ratios are almost constant with a change in temperature. 3) In the p-xylene extraction system, a hydrated metal complex, MQ2·2H22H2O, may precipitate and be deposited at the interface of ...