New thiophene-based azo ligands containing azo methine group in the main chain for the determination of copper(II) ions

Dinçalp, Haluk; Toker, Fatih; Durucasu, İnci; Avcıbaşı, Nesibe; İçli, Sıddık

doi:10.1016/j.dyepig.2006.05.015

Cited by 98 publications

(38 citation statements)

References 46 publications

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“…25 To the solution of aniline derivative (4 mmol) in water (2 ml), concentrated hydrochloric acid (8 ml) was added gently with stirring. The solution was cooled down to 0-5 o C in ice bath and diazotized with solution of sodium nitrite (0.315 g, 4.5 mmol) in water (3.5 ml), at this low temperature.…”

Section: Synthesis Of the Azo Compounds (1a-3a)mentioning

confidence: 99%

Selective Naked-Eye Detection of Acetate by New Azo-Isonicotinohydrazide Derivatives

Makki¹,

Balakit²

2017

Orient. J. Chem

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Three new hydrazone, based on azo-isonicotinohydrazide derivatives, have been designed, synthesized and characterized by FT-IR, 1 H NMR and 13 C NMR spectroscopy. The new compounds were designed to act as selective molecular sensors for naked-eye detection of acetate anion. To study the effect of the substituent at certain position in the main structure on the selectivity of the sensor, the compounds were designed to have −CH 3 , −H or −NO 2 at that position. Solutions of different anions (F − , H 2 PO 4 − , NO 2 − , NO 3 − , Cl − , HSO 4 − , ΗCO3 − ) and AcO − were used to test the selectivity. The results revealed that the compound with electron withdrawing group (NO 2 ) interacts selectively with acetate producing a significant feasible color change which makes it considered as selective molecular sensor for naked-eye detection of acetate. The dissociation constant for AcO − with the new sensor was also determined.

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Section: Synthesis Of the Azo Compounds (1a-3a)mentioning

confidence: 99%

Selective Naked-Eye Detection of Acetate by New Azo-Isonicotinohydrazide Derivatives

Makki¹,

Balakit²

2017

Orient. J. Chem

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“…They are known as widespread dyes and pigments [1][2][3] and studied as liquid crystalline and supramolecular systems [4,5]. Owing to their ability to reversible trans/cis isomerization, aryl and hetaryl diazenes are investigated as promising objects for design of advanced materials such as NLO devices and photoresponsive materials [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

N‐substituted bis(tetrazol‐5‐yl)diazenes: Synthesis, spectra, X‐ray molecular and crystal structures, and quantum‐chemical DFT calculations

Serebryanskaya

Матулис

Lyakhov

et al. 2010

Heteroatom Chemistry

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N-Substituted bis (tetrazol-5-yl) (1-phenyltetrazol-5-yl) diazene (3b) and bis(2-tert-butyltetrazol-5-yl)diazene (3d) were determined by single crystal X-ray diffraction. Molecules of these compounds are transisomers in solid. According to X-Ray data, 3b molecule is S-trans-S-trans conformer, however 3d is S-cis-Scis one. Quantum-chemical investigation of geometry and relative stability of cis-and trans-isomers and stable conformations of compounds 3a-d was carried out.

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“…The lilac precipitates of the completely by K 2 O 8 S 2 oxidized monoazo compound (formed from 3.7 mg ABTS) showed major stretching vibrations at 1506.6, 1472.8, and 1441.4 cm −1 , i.e., in the range of (1555) 1525-1410 cm −1 associated with the presence of the -N=N-double bonds in the majority of azo dyes [59][60][61][62]. The compound generated by fresh beech wood chips (compare Section 2.2; 1.7 mg ABTS in 40 mg KH 2 PO 4 ) showed then the azo group related band at 1473.77 cm −1 in an environment of a general structural decay, with the dominance of signals from P-O bonds around 859 cm −1 (Figure 8) [63].…”

Section: Comparison Of Abts Derivatives By Fourier Transform Infraredmentioning

confidence: 99%

Section: Comparison Of Abts Derivatives By Fourier Transform Infraredmentioning

confidence: 99%

Reappraising a Controversy: Formation and Role of the Azodication (ABTS2+) in the Laccase-ABTS Catalyzed Breakdown of Lignin

Gramss

2017

Fermentation

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Abstract:In fermentations of lignocelluloses, redox potentials (If not indicated otherwise, redox potentials in Volt are taken versus Normal Hydrogen Reference Electrodes (NHE).) E 0 of laccases/plant peroxidases by 0.79/0.95 V enable oxidations of phenolic substrates and transformations of synthetic and substrate-derived compounds to radicals that mediate attacks on non-phenolic lignin (models) by 1.5 V. In consecutive one-electron abstractions, the redox mediator 2,2 -azinobis-(3-ethylbenzothiazoline-6-sulfonate) (ABTS) is oxidized by electro-or wet-chemistry to the green cation radical (ABTS •+ , 0.68 V) and the red dication (ABTS 2+ , 1.09 V). The enzyme/ABTS couple generates the stable ABTS •+ whose low E 0 cannot explain the couple's contemporary attack on non-phenolic lignins. This paradoxon indicates the non-confirmed production of the ligninolytic ABTS 2+ by the enzymes. During incubations of live sapwood chips in ABTS/H 2 O 2 to prove their constitutive peroxidase, the enzyme catalyzed the formation of the expected green-colored ABTS •+ solution that gradually turned red. Its spectrophotometric absorbance peaks at λ = 515-573 nm resembled those of ABTS 2+ at 518-520 nm. It is shown that portions of an ABTS •+ preparation with inactivated enzyme are reduced to ABTS during their abiotic oxidation of low-MW extractives from lignocelluloses to redox mediating radicals. The radicals, in turn, apparently transform the remaining ABTS •+ to red derivatives in the absence of functional oxidoreductases. Ultrafiltration and Liquid-Chromatography suggest the presence of a stable ABTS 2+ compound absorbing at 515 nm, red protein/ABTS adducts, and further ABTS moieties. Therefore, ABTS mediated lignin degradations could result from chain reactions of ABTS •+ -activated lignocellulose extractives and fissured rather than complete ABTS 2+ molecules.

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New thiophene-based azo ligands containing azo methine group in the main chain for the determination of copper(II) ions

Cited by 98 publications

References 46 publications

Selective Naked-Eye Detection of Acetate by New Azo-Isonicotinohydrazide Derivatives

Selective Naked-Eye Detection of Acetate by New Azo-Isonicotinohydrazide Derivatives

N‐substituted bis(tetrazol‐5‐yl)diazenes: Synthesis, spectra, X‐ray molecular and crystal structures, and quantum‐chemical DFT calculations

Reappraising a Controversy: Formation and Role of the Azodication (ABTS2+) in the Laccase-ABTS Catalyzed Breakdown of Lignin

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