A centrifuge-less cloud point extraction-spectrophotometric determination of copper(II) using 6-hexyl-4-(2-thiazolylazo)resorcinol

Racheva, Petya; Milcheva, Nikolina; Genç, Fatma; Gavazov, Kiril B.

doi:10.1016/j.saa.2021.120106

Cited by 28 publications

(12 citation statements)

References 42 publications

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“…In acidic solutions, the recorded spectrum of the Co–HTAR complex (2) changes to λ max = 524 nm. This hypsochromic shift can be attributed to the lower absorbance of the blank (2’), which is determined by the existence of the HTAR reagent mainly in its neutral form (H 2 L) at pH < 6.7 [ 52 ]. The addition of APS does not affect the position of λ max , but the absorbance becomes higher (compare spectra 2 (Co-HTAR) and 2” (Co-HTAR-APS)).…”

Section: Resultsmentioning

confidence: 99%

“…The samples were kept in a refrigerator (at ca. −20 °C) for 30 min, as in our previous work on Cu(II) extraction with the same surfactant (TX-114) and reagent (HTAR) [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

“…Working 4 × 10 −4 mol L −1 Co(II) solutions were obtained by appropriate dilution with water. An aqueous solution of HTAR (2 × 10 −3 mol L −1 ) was prepared in the presence of KOH [ 52 ]. Laboratory grade TX-114 was used.…”

Section: Methodsmentioning

confidence: 99%

“…The aim of this work was to develop a CL-CPE–spectrophotometric procedure for the determination of traces of cobalt, using 6-hexyl-4-(2-thiazolylazo)-resorcinol (HTAR). This novel hydrophobic reagent ( Figure 1 ) has recently been applied in our laboratory for the CL-CPE of vanadium(IV,V) [ 51 ] and copper(II) [ 52 ].…”

Section: Introductionmentioning

confidence: 99%

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Use of a Hydrophobic Azo Dye for the Centrifuge-Less Cloud Point Extraction–Spectrophotometric Determination of Cobalt

et al. 2022

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The hydrophobic azo dye 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR, H2L) was studied as part of a system for the centrifuge-less cloud point extraction (CL-CPE) and spectrophotometric determination of traces of cobalt. The extracted 1:2 (Co:HTAR) complex, [CoIII(HL−)(L2−)]0, shows an absorption maximum at 553 nm and contains HTAR in two different acid–base forms. Optimum conditions for its formation and CL-CPE were found as follows: 1 × 10−5 mol L−1 of HTAR, 1.64% of Triton X-114, pH of 7.8, incubation time of 20 min at ca. 50 °C, and cooling time of 30 min at ca. −20 °C. The linear range, limit of detection, and apparent molar absorptivity coefficient were 5.4–189 ng mL−1, 1.64 ng mL−1, and 2.63 × 105 L mol−1 cm−1, respectively. The developed procedure does not use any organic solvents and can be described as simple, cheap, sensitive, convenient, and environmentally friendly. It was successfully applied to the analysis of artificial mixtures and real samples, such as steel, dental alloy, rainwater, ampoules of vitamin B12, and saline solution for intravenous infusion.

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Section: Resultsmentioning

confidence: 99%

“…The samples were kept in a refrigerator (at ca. −20 °C) for 30 min, as in our previous work on Cu(II) extraction with the same surfactant (TX-114) and reagent (HTAR) [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Use of a Hydrophobic Azo Dye for the Centrifuge-Less Cloud Point Extraction–Spectrophotometric Determination of Cobalt

et al. 2022

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“…It is based on an anionic complex of 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR; Figure 1 b) with V(V). HTAR is a novel reagent for V(V), Cu(II), and Co(II) [ 22 , 23 , 24 ]. Like other azo derivatives of resorcinol, it can form an anionic chelate with V(V) in slightly acidic media, [VO 2 (HTAR 2− )] − , which tends to form chloroform-extractable ion-association complexes with appropriate cations [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

et al. 2023

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Four azo dyes known to form anionic complexes with V(V) were investigated as potential liquid–liquid extraction–spectrophotometric reagents for the antihistamine medication hydroxyzine hydrochloride (HZH). A stable ion-association complex suitable for analytical purposes was obtained with 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR). The molar absorption coefficient, limit of detection, linear working range, and relative standard deviation in the analysis of real pharmaceutical samples (tablets and syrup) were 3.50 × 104 L mol−1 cm−1, 0.13 μg mL−1, 0.43–12.2 μg mL−1, and ≤2.7%, respectively. After elucidating the molar ratio in the extracted ion-association complex (HZH:V = 1:1), the ground-state equilibrium geometries of the two constituent ions—HZH+ and [VO2(HTAR)]−—were optimized at the B3LYP level of theory using 6-311++G** basis functions. The cation and anion were then paired in four different ways to find the most likely structure of the extracted species. In the lowest-energy structure, the VO2 group interacts predominantly with the heterochain of the cation. A hydrogen bond is present (V–O···H–O; 1.714 Å) involving the terminal oxygen of this chain.

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Synthesis, Electrochemical and Antioxidant Properties of New Thiazolylazo‐based Mixed Ligand Metal Complexes

et al. 2023

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The complexes of 4‐(2‐thiazolylazo)resorcinol (TAR) and 2,2′‐bipyridine (bpy), [M(bpy)(TAR)(H2O)]AcO [(M=CoII, CuII, ZnII] and [Mn(bpy)(TAR)AcO] were synthesized and their structure was determined by elemental analysis, thermal analysis (DTA/TGA), IR spectroscopy, molar conductivity, and magnetic measurements. The ligand 4‐(2‐thiazolylazo)resorcinol coordinated to metalII ions via azo and thiazolyl group nitrogens and one oxygen atom of resorcinol, while 2,2′‐bipyridine also contributed two coordination bonds via its nitrogen atoms. The electrochemical profile of the compounds was investigated by cyclic voltammetry (CV) which confirmed their electrochemical activity. The results obtained by CV method pointed out that the electrode reactions were diffusion controlled. The total antioxidant capacities of the ligands and complexes were evaluated by using cupric reducing antioxidant capacity (CUPRAC) method. The complexes displayed more antioxidant activity than their ligands. The Trolox equivalent antioxidant activity (TEAC) values of all complexes exhibited more higher and approximate values to Trolox but bpy ligand did not show any activity.

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A centrifuge-less cloud point extraction-spectrophotometric determination of copper(II) using 6-hexyl-4-(2-thiazolylazo)resorcinol

Cited by 28 publications

References 42 publications

Use of a Hydrophobic Azo Dye for the Centrifuge-Less Cloud Point Extraction–Spectrophotometric Determination of Cobalt

Use of a Hydrophobic Azo Dye for the Centrifuge-Less Cloud Point Extraction–Spectrophotometric Determination of Cobalt

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

Synthesis, Electrochemical and Antioxidant Properties of New Thiazolylazo‐based Mixed Ligand Metal Complexes

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