Thiazolylazo dyes and their application in analytical methods

Lemos, Valfredo Azevedo; Santos, Elenir Souza; Santos, Moacy Selis; Yamaki, Regina Terumi

doi:10.1007/s00604-006-0704-9

Cited by 69 publications

(34 citation statements)

References 99 publications

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“…13 as "a very stable and fairly selective complexing reagent". One can expect that this reagent is better for liquid-liquid extraction (LLE) separation/preconcentration based on ionassociation systems 14 than the well-known 4-(2-thiazolylazo)resorcinol (TAR) 5,7 and 4-(2-pyridylazo)resorcinol (PAR) 15,16 by virtue of the additional CH 3 group in its molecule (Table 1). However, the LLE behavior of TAO has never been studied.…”

Section: Introductionmentioning

confidence: 99%

Liquid-Liquid Extraction-Spectrophotometric Investigations of Three Ternary Complexes of Vanadium(V)

Gavazov¹,

Stefanova²

2014

Croat. Chem. Acta

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Abstract. Complex formation and liquid-liquid extraction (LLE) were studied in systems containing vanadium(V), 5-methyl-4-(2-thiazolylazo)resorcinol (TAO), tetrazolium salt (TZS), water and chloroform. The following three TZSs 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). Concentration of the reagents (TAO and TZS), pH of the aqueous medium, and shaking time were subjects of optimization experiments. Formation of ternary complexes with a composition of 2:2:2 was demonstrated by a set of different methods. Some key characteristics concerning the analytical application of the studied LLE-chromogenic systems were established as well.

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Section: Introductionmentioning

confidence: 99%

Liquid-Liquid Extraction-Spectrophotometric Investigations of Three Ternary Complexes of Vanadium(V)

Gavazov¹,

Stefanova²

2014

Croat. Chem. Acta

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“…TAC was selected as the organic chromophore because it possesses multiple metal binding sites, such as nitrogen, sulfur, and oxygen atoms, which facilitate its binding with various metal ions. [20][21][22][23] According to previous studies, some transition metal ions can selectively bind with certain anions; for instance, Zn 2+ complexes can serve as effective sensors for phosphate anions through anion direct binding or anion elicit Zn 2+ sequestering. 24 In terms of the TACZn 2+ ensemble, 20 selective H2PO4 -anion sensing was realized through the elicit Zn 2+ sequestering approach as a result of the formation of an inorganic complex between Zn 2+ and the H2PO4 -anions.…”

Section: Introductionmentioning

confidence: 99%

Chemosensing Ensembles of 2-(2-Thiazolylazo)-p-cresol with Metal Ions in Colorimetric Detection of Anions

Wang

Liu

2017

ANAL. SCI.

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All chemicals and solvents were of analytic grade and were bought from commercial sources without further purification. The solutions of anions and metal ions were used as sodium and chloride salts, respectively. UV/visible (UV/Vis) absorption spectra were recorded through UV 1901 spectroscopy (Shanghai Lengguang Technology Co., Ltd., China). The pH measurements This paper reports that changing metal ions (Co 2+ , Ni 2+ , Cu 2+ , or Cd 2+ ) in the 2-(2-thiazolylazo)-p-cresol (TAC)-metal ensemble may generate varied optical responses to anions. The TAC and Ni 2+ ensemble can detect and quantify CN -in a highly sensitive and selective manner. CN -competes for the Ni 2+ present in the ensemble during recognition events, which thereby triggers colorimetric and absorption spectral changes. CN -and S 2-decomposed TAC-Cu 2+ ensemble by forming [Cu(CN)x] n-species and CuS, respectively; however, the discrimination of CN -and S 2-was not achieved. The TAC-Co 2+ ensemble exhibited discriminated interaction with CN -through the absorption channel, but CN -was not quantitatively determined. Although the TAC-Cd 2+ ensemble responded to different anions, it did not recognize each anion selectively. These results demonstrated that metal ions can powerfully modulate anion identification to some extent, which can be an effective strategy to achieve selectivity of certain anions by varying the metal ions in the ensemble.

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“…A large number of azo dyes that are prepared from diazotization of 2-aminothiazole and its derivatives and subsequent coupling of the corresponding product with phenolic or other aromatic substances have been prepared and investigated for various purposes [2]. They are found in a variety of industrial applications mainly because of their low price and color fastness [3]. Nowadays, thiazolylazo dyes are useful in the manufacture of data storage devices such as CD, DVD and Blue-ray discs [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural characterization and thermal studies of a novel reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol

Tupys

Kalembkiewicz

Ostapiuk

et al. 2016

J Therm Anal Calorim

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A new thiazolylazo reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol has been synthesized via arylation of acrolein and further diazotization and diazocoupling with 2-naphthol. The chemical structure of the compound was confirmed by IR, NMR: 1 H, 13 C, COSY, HSQC and SALDI-MS spectral data. The DSC method was employed to determine the melting point and the enthalpy of fusion (T fus = 159.7°C and DH fus = 28.0 kJ mol -1 , respectively). Thermal stability and decomposition studies of the obtained azo dye were performed in air and nitrogen atmosphere using the TG technique. The evolved gases from the heated sample were registered on FTIR spectra. The decomposition of the azo dye in air atmosphere occurred in five consecutive stages. The pK a ionization constants of the substance were determined in ethanol-water mixture (1:1 v/v) by means of the spectroscopic method and were found to be equal to 0.41 for pK a1 and 9.59 for pK a2 . Using the spectrophotometric procedures, the methods for determination of trace amounts of toxic metallic ions with the new reagent were characterized and limits of detection were calculated.

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Thiazolylazo dyes and their application in analytical methods

Cited by 69 publications

References 99 publications

Liquid-Liquid Extraction-Spectrophotometric Investigations of Three Ternary Complexes of Vanadium(V)

Liquid-Liquid Extraction-Spectrophotometric Investigations of Three Ternary Complexes of Vanadium(V)

Chemosensing Ensembles of 2-(2-Thiazolylazo)-p-cresol with Metal Ions in Colorimetric Detection of Anions

Synthesis, structural characterization and thermal studies of a novel reagent 1-[(5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol

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