The Study of Copper (Ii) Complexation With 2,6-Dithiol-4-Tert-Butylphenol and Hydrophobic Amines

Kuliev, K. A.; Verdizade, N. A.; Suleymanova, G. S.

doi:10.21285/2227-2925-2017-7-2-21-32

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“…This solvent is less toxic than the diluents commonly applied to improve the physico-chemical characteristics of the ionic liquid А336 (e.g., benzene, 57 carbon tetrachloride, 58 chloroform, 58 toluene, 59 xylene 60 and kerosene 61 ) and the organic solvents typically used for LLE-spectrophotometric determination of Ni II (e.g., chloroform). [17][18][19][20]…”

Section: Discussionmentioning

confidence: 99%

“…[10][11][12][13][14] The methods involving spectrophotometry are simple and low-cost; they can be easily combined with procedures for preliminary separation and concentration, such as cloud point extraction, 13 solid phase extraction 14 and liquid-liquid extraction (LLE). [15][16][17][18][19][20] 5-methyl-4-(2-thiazolylazo)resorcinol (MTAR) is a well-known analytical reagent. [21][22][23][24][25][26][27][28] It has recently been used in our laboratory for LLE of V IV,V .…”

Section: Introductionmentioning

confidence: 99%

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Extraction-Chromogenic System for Nickel(II) Based on 5-methyl-4-(2-thiazolylazo)resorcinol and Aliquat 336

Toncheva

Hristov

Milcheva

et al. 2020

ACSi

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A water−isobutanol extraction-chromogenic system for Ni II , based on the azo dye 5-methyl-4-(2-thiazolylazo)resorcinol (MTAR; H 2 L) and the ionic liquid Aliquat 336 (A336), was studied. Under the optimal conditions (c MTAR = 2.0 × 10-4 mol dm-3 , c A336 = 5.6 × 10-3 mol dm-3 , pH 8.5 and extraction time t = 1 min), Ni II is extracted as a ternary complex which can be represented by the formula (A336 +) 2 [Ni(L 2−) 2 ]. In the absence of A336, or in a slightly acidic medium, a binary complex, [Ni(HL −) 2 ], with an absorption maximum at λ = 548 nm and a shoulder at 590 nm is formed. The following extraction-spectrophotometric characteristics were determined at the above-mentioned optimal conditions: λ max (545 nm), molar absorptivity (5.0 × 10 4 dm 3 mol-1 cm-1), Sandell's sensitivity (1.2 × 10-3 μg cm-2), Beer's law limits (0.05-3.1 µg cm-3), constant of extraction (Log K = 6.1) and fraction extracted (99.2%). The effect of foreign ions was studied; the most serious interferences were caused by Co II , Cu II and Cr III .

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