Abstract
8-Hydroxy-5-quinolinesulfonic acid (H2QS) reacted with Zn(il)in the presence of zephiramine (Z r, tetradecy1-dimethy1-benzy1-ammonium chloride)to form a temary complex of yellow coloratien, having an absorption maximum at 395 nm in chloroform. The extractability ef the complex into chloroform was 99.83% at pH 8.5, Nt9, 2. The solutions of 2.63. v52.6 ptg of zinc in 10 ml chloroform obeyed Beers law and the molar absorp, tivity was 1.16x10 cmwi. mol-I l and the sensitivity for O. OO1 of abserbance was O.0056 ptg/cm2.The composition of the extraeted species, a kind of self adduct. complex, was esti: mated to Vbe [Zn2 (QS2-wtZ)tii(Z QS2irZ)]6S Vin the case of a iarge excess ef zephiramine, and [Zn2 (QS2-Z)2e (HQs-Z)]. in. the case of a small excess of it. The logarithm of the equilibrium constant K for the reaction shown by eqns. (3), -v(5) was found to be; log K=25.40 O.09...
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