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Extraction-spectrophotometric investigations on two ternary ion-association complexes of gallium(III)

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Stojnova K., Gavazov K., Toncheva G., Lekova V., Dimitrov A.

Open Chemistry

2012

vol. 10

issue 4

1262-1270

Complex formation and liquid-liquid extraction were studied in systems containing Ga(III), azoderivative of resorcinol {4-(2-pyridylazo)resorcinol (PAR) or 4-(2-thiazolylazo)resorcinol (TAR)}, 2,3,5-triphenyltetrazolium chloride (TTC), water and chloroform. The optimum conditions w.r.t. pH, extraction time, concentration of ADR and concentration of TTC for the extraction of Ga(III) as an ion-associate complex were found.. The composition of the extracted complexes, (TT+)[Ga(PAR)2] (I), (TT+)[Ga(TAR)2] (II) or (TT+)2[Ga(OH)(TAR)2] (III), and the constants of association (β) between 2,3,5-triphenyltetrazolium cation (TT+) with corresponding anionic chelates were established by several methods. The constants of distribution (KD) and extraction (Kex) of the principal species I and III were determined as well. The apparent molar absorptivities of the chloroform extract at the optimum extraction-spectrophotometric conditions were ɛ′510=9.5×104 L mol−1 cm−1 (I) and ɛ′530=4.6×104 L mol−1 cm−1 (III). The validity of Beer’s law was checked and analytical characteristics that were calculated are reported herein. [...]

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1 Open Chemistry

1 2012

1 Dimitrov A.

1 Gavazov K.

1 Lekova V.

1 Stojnova K.

1 Toncheva G.

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Extraction-spectrophotometric investigations on two ternary ion-association complexes of gallium(III)