Complex formation and liquid-liquid extraction were studied in systems containing iron(III), 4-nitrocatechol (4NC),tetrazolium salt (TZS), water and organic solvent. Three different TZS were used: 3-(4,5-dimethyl-2-thiazol)-2,5-diphenyl-2H-tetrazolium bromide (MTT), 3-(2-naphtyl)-2,5-diphenyl-2H-tetrazolium chloride (Tetrazolium violet, TV) and 2-(4-iodophenyl)-3-(4-nitrophenyl)-5-phenyl-2H-tetrazolium chloride (INT).The cations of the first two TZSs (TZ+: MTT+ and TV+) form intensively colored (molar absorptivity of 4.6´104 L mol–1 cm–1 and 4.4´104 L mol–1 cm–1, respectively) chloroform extractable ion-associates with the FeIII-4NC anionic chelate. These ternary complexes can be represented with the following general formula: (TZ+)3[FeIII(4NC)3]3−.
在含有
铁(III)、4-硝基
邻苯二酚(4NC)、
四唑盐(TZS)、
水和有机溶剂的体系中研究了络合物的形成和液液萃取。使用了三种不同的 TZS:3-(4,5-二甲基-2-
噻唑)-2,5
-二苯基-2H-
溴化
四唑(M
TT)、3-(2-
萘基)-2,5
-二苯基-2H-
氯化
四唑(
四唑紫,TV)和 2-(4-
碘苯基)-3-(4-
硝基苯基)-5-苯基-2H-
氯化
四唑(
INT)。前两种 TZS 的阳离子(TZ+:M
TT+ 和 TV+)与 FeIII-4NC 阴离子螯合物形成颜色强烈(摩尔吸收率分别为 4.6´104 L mol-1 cm-1 和 4.4´104 L mol-1 cm-1)的
氯仿可萃取离子螯合物。这些三元络合物可用以下通式表示:(TZ+)3[FeIII(4NC)3]3−.