Spectrophotometric investigations of the role of the organic solvent on the acid dissociation constants of some azo dyes derived from 2-aminobenzothiazole
作者:Y.H. Ebead、H.M.A. Salman、M. Khodari、A.A. Ahmed
DOI:10.1016/j.molliq.2010.04.002
日期:2010.7
Proton dissociationconstants (pKa) of a set of hydroxyl azo dyes in various organic solvent + water mixtures have been determined. The results obtained were discussed in terms of the solvent characteristic. Effects of hydrogen-bonding interactions and solvent basicity on the ionization process have been also discussed. In a nutshell, the pKa values of the investigated compounds were found to be largely
已经确定了一组羟基偶氮染料在各种有机溶剂+水混合物中的质子解离常数(p K a)。讨论了所得结果的溶剂特性。还讨论了氢键相互作用和溶剂碱性对电离过程的影响。简而言之,p K a发现所研究化合物的值在很大程度上取决于有机助溶剂的比例和性质。此外,了解我们在液体溶液中处理哪种结构以及这些结构如何影响各个互变异构体的理化性质及其酸度常数,这一点非常重要。因此,已经进行了理论计算,以便深入了解所研究化合物的结构特征和理化性质。
Drapkina,D.A. et al., Journal of general chemistry of the USSR, 1962, vol. 32, p. 1522 - 1525
作者:Drapkina,D.A. et al.
DOI:——
日期:——
Azo Derivatives of Pyrocatechol, Resorcinol, and Salicylic Acid as Collectors for Sulfide Ore Flotation
作者:V. Yu. Gusev、E. V. Baigacheva、V. O. Gogolishvili
DOI:10.1134/s1070427219120150
日期:2019.12
Heterocyclic and aromatic azo derivatives of pyrocatechol, resorcinol, and salicylic acid have been investigated as collectors for the flotation of sulfide ores. The acid-base properties of the compounds were studied, their solubility in an alkaline solution was determined. It was established that the fixing of reagents on the surface of the ore occurs mainly by the chemical mechanism. Adsorption constants were calculated. It was found that most of the studied reagents exhibit collective properties with respect to sulfide copper-nickel ore. The use of mixtures of azo compounds with potassium butyl xanthogenate leads to an increase in the degree of extraction of nickel and copper, as well as the quality of the concentrates, in comparison with one butyl xanthogenate.