The acid dissociation constants of dihalogenated 8-hydroxyquinaldines and the stability constants of their chelates with Zn[II], Ni[II], Co[II], Pb[II], Cd[II], Mn[II], and Mg[II] have been determined. The Calv in-Bjerrum potentiometric titration technique was used in studying the behavior of these substances. The order of decreasing stability of the metal chelates Zn, Ni>Co>Pb>Cd>Mn>Mg is . similar to the stability sequence generally obtained for divalent metals, and the order of decreasing stability of dihalogenated 8-hydroxyquinaldines to form the metal chelates with metal ions is I>Br>Cl. Spot test reactions of dihalogenated 8-hydroxyquinaldines and B-hydroxyquinolines with the metal ions also have been investigated.
The acid dissociation constants of substituted 8‐hydroxyquinolines and the stability constants of their chelates with Co(II), Ni(II), Cd(II), Zn(II) and Pb(II) have been determined. The Calvin‐Bjerrum potentiometric titration technique was used in studying the behavior of these substances.
The thermal behaviors of chelates of oxine, 8‐hydroxyquinaldine and their derivatives (DCQ, 5, 7‐dichloro‐8‐hydroxyquinoline; DCQ', 5, 7‐dichloro‐8‐hydroxyquinaldine) in an air atmosphere have been studied. The order of heat stability of chelates, decreased with decreasing basicity of the ligand, i.e. oxine
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