Azo dyes containing 1,3,4-thiadiazole fragment: synthesis, properties

2022 ◽  
Author(s):  
Galina A. Selivanova ◽  
Alexandrina Dmitrievna Skolyapova ◽  
Jiaying Wang ◽  
Elena Viktorovna Karpova ◽  
Inna Shundrina ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Azo Dyes ◽  
Azo Compounds ◽  
Imino Group ◽  
Synthesis Properties ◽  
Thiadiazole Derivatives

New 1,3,4-thiadiazole derivatives containing a diazenyl group, as well as simultaneously a diazenyl and an imino group were synthesized and their opticaland thermal properties were investigated. Initially, new azo compounds...

scholarly journals Synthesis, spectroscopic, and thermal studies of azo compounds from luminol and procaine with acetylacetone and their complexes

2021 ◽  
Vol 2063 (1) ◽  
pp. 012016
Author(s):  
Noor Al AlBaheley ◽  
T A Fahad ◽  
Asaad A Ali
Keyword(s):  
Thermal Decomposition ◽  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Elemental Analysis ◽  
Azo Dyes ◽  
Thermal Studies ◽  
Bidentate Ligand ◽  
Azo Compounds ◽  
Molar Ratios ◽  
Ft Ir

Abstract This The study entails the synthesis of two newly synthesized azo dyes luminol and procaine with acetylacetone (N1 and N2 correspondingly). Elementalanalysis, 1HNMR, T.G.A, and FTIR. have all been used to characterize dyes. These new dyes were reacted with Cpper and Nikel ionin 1:2 molar ratios to form of complexes of metals (II) with a general stoichiometry; CuL2, and NiL2 in complexes., FT IR, as well as the corresponding metal (II) complex, were used to characterize them. The dye acts as a bidentate ligand, according to elemental analysis and spectral results. The thermal properties of these compounds were investigated using thermogravimetric analysis (TGA). Thermal decomposition of these compounds is a process that occurs in stages.,

Depression Performance of Azo Dyes to Sulfide Minerals

2011 ◽  
Vol 287-290 ◽  
pp. 3074-3080
Author(s):  
Li Hong Lan ◽  
Jian Hua Chen ◽  
Ping Lan ◽  
Mei Lian Liang ◽  
Ye Chen
Keyword(s):  
Azo Dyes ◽  
Sulfide Minerals ◽  
Frontier Molecular Orbital ◽  
Azo Compounds ◽  
Orbital Energy ◽  
Energy Calculation ◽  
Mineral Surfaces ◽  
Good Adhesion ◽  
Azo Compound ◽  
Azo Group

Azo dyes have strong hydrophilic and good adhesion to solid surface. In this study, 23 kinds of typical azo compounds were tested as depressant of sulfide minerals. Absorption of azo compound on mineral surfaces was detected by UV. The result shows that some of them can be good depressants of single sulfide minerals. With the number of azo group increasing from 1 to 3, depression performances are improved. On the other hand, depression performances of azo dye are related to the type of group and the location of phenyls，the results of adsorption and the frontier molecular orbital energy calculation may be used to explain depression performances of azo dyes.

scholarly journals Novel edaravone-based azo dyes: efficient synthesis, characterization, antibacterial activity, DFT calculations and comprehensive investigation of the solvent effect on the absorption spectra

RSC Advances ◽  
2020 ◽  
Vol 10 (59) ◽  
pp. 35729-35739
Author(s):  
Mohammad Amin Davasaz Rabbani ◽  
Behzad Khalili ◽  
Hamid Saeidian
Keyword(s):  
Antibacterial Activity ◽  
Dft Calculations ◽  
Solvent Effect ◽  
Absorption Spectra ◽  
Azo Dyes ◽  
Drug Combination ◽  
Azo Compounds ◽  
Efficient Synthesis ◽  
Comprehensive Investigation ◽  
Anions And Cations

The present study deals with designing and synthesizing novel dyes using the drug combination of edaravone and azo compounds which can be used as an indicator for anions and cations.

Optical and Thermal Properties of Nickel-Azo Dyes for Digital Versatile Disc-Recordable

2003 ◽  
Vol 20 (9) ◽  
pp. 1517-1519 ◽  
Author(s):  
Wei Bin ◽  
Wu Yi-Qun ◽  
Gu Dong-Hong ◽  
Gan Fu-Xi
Keyword(s):  
Thermal Properties ◽  
Azo Dyes ◽  
Digital Versatile Disc

Synthesis, properties and application of four new 1;2 aluminium-complexed azo dyes

2003 ◽  
Vol 119 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Jacob Hooker ◽  
David Hinks ◽  
Harold Freeman
Keyword(s):  
Azo Dyes ◽  
Synthesis Properties

scholarly journals Synthesis of azo polymers by etheric derivatives polymerization of allyl bromide and studying their bandgap and determine some of their properties: اصطناع بوليميرات آزو ببلمرة مشتاقات إيتيرية لبروميد الآليل ودراسة فجوتها الطاقية وتعيين بعض خصائصها الفيزيائية

2021 ◽  
Vol 5 (4) ◽  
pp. 155-142
Author(s):  
Ghazi Mahmoud Hasso Jawish, Rushdi Madwar, Francois Kara Bet Ghazi Mahmoud Hasso Jawish, Rushdi Madwar, Francois Kara Bet
Keyword(s):  
Refractive Index ◽  
Thermal Properties ◽  
Azo Dyes ◽  
Kinematic Viscosity ◽  
Allyl Bromide ◽  
Bandgap Energy ◽  
Azo Polymers ◽  
Ft Ir ◽  
Derivatives Of

In this research, two ether derivatives of phenolic azo dyes were synthesized via Williamson's reaction according to the SN2 mechanism. The prepared compounds were radically polymerized using (AIBN) as an initiator and their structures were identified by FT-IR and 1H-NMR. Furthermore, thermal properties of these polymers was made by (DSC). Bandgap energy have been calculated to indicate the ability of these polymers as optical semiconductors, it was 2.8ev, 2.4ev for P(AO2) and P(AON1) respectively. Beside the determination of refractive index, kinematic viscosity, density, and degree of Turbidity.

Synthesis and study of new azo dyes based on functionally substituted derivatives of salicylic acid

2020 ◽  
Vol 63 (7) ◽  
pp. 31-38
Author(s):  
Nadezhda M. Kuzmina ◽  
◽  
Dmitry S. Gusarov ◽  
Thi Ngok An Vu ◽  
Olga V. Kovalchukova ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Benzoic Acid ◽  
Azo Dyes ◽  
Azo Dye ◽  
Azo Compounds ◽  
Amino Group ◽  
Acid Dyes ◽  
Absorption Bands ◽  
Lipinski’S Rule ◽  
Dye Molecule

Three chromatographically pure azo dyes based on salicylic acid and para-nitroaniline were isolated in 60-64% yields. The structure of the synthesized compounds was proved by IR spectroscopy. The spectra of the compounds contain characteristic absorption bands associated with the vibrations of O–H, N–H, C=O, and N=N groups. The products precipitated as orange-brown powders, which corresponds to compounds with a short system of conjugated double bonds. The predominant tautomeric form of existence of the synthesized azo compounds was determined – 5,5'-(diazen-1,2-diyl)bis(2-hydroxybenzoic acid), 2-hydroxy-5-((4-nitrophenyl)-diazenyl)benzoic acid, 5-amino-2-hydroxy-4-((4-nitrophenyl) diazenyl) benzoic acid. It was shown that they all exist as azo-tautomers. To determine the dyeing power of potential dyes, a test cold dyeing was carried out on samples of a multichannel consisting of six main types of fabrics used in the textile industry, under conditions corresponding to dyeing with acid and reactive dyes. The ability of the compounds to act as acid dyes was established, coloring woolen, polyamide and acetate fibers in yellow-orange and beige-brown colors. The introduction of an amino group into the salicylic acid fragment weakens the color properties of the azo dye molecule. The calculation of the toxicity of compounds with intravenous and oral routes of administration, carried out according to the GUSAR program, shows their low toxicity (4-5 toxicity class). The introduction of an amino group into the azo dye molecule is accompanied by an increase in its toxicity. All isolated compounds comply with Lipinski's rule, which indicates their bioavailability. Prediction of the biological activity of the compounds, carried out using the PASS program, shows that with a probability of more than 90%, the synthesized compounds exhibit antiseptic properties without irritating the skin and mucous membranes. This allows the isolated compounds to be considered promising for use as dyes in cosmetics.

scholarly journals The Function of Cytoplasmic Flavin Reductases in the Reduction of Azo Dyes by Bacteria

2000 ◽  
Vol 66 (4) ◽  
pp. 1429-1434 ◽  
Author(s):  
Rainer Russ ◽  
Jörg Rau ◽  
Andreas Stolz
Keyword(s):  
Azo Dyes ◽  
Reduction Rate ◽  
Constitutive Expression ◽  
Azo Compounds ◽  
Flavin Reductase ◽  
Whole Cells ◽  
E Coli ◽  
Cell Extracts

ABSTRACT A flavin reductase, which is naturally part of the ribonucleotide reductase complex of Escherichia coli, acted in cell extracts of recombinant E. coli strains under aerobic and anaerobic conditions as an “azo reductase.” The transfer of the recombinant plasmid, which resulted in the constitutive expression of high levels of activity of the flavin reductase, increased the reduction rate for different industrially relevant sulfonated azo dyes in vitro almost 100-fold. The flavin reductase gene (fre) was transferred to Sphingomonas sp. strain BN6, a bacterial strain able to degrade naphthalenesulfonates under aerobic conditions. The flavin reductase was also synthesized in significant amounts in theSphingomonas strain. The reduction rates for the sulfonated azo compound amaranth were compared for whole cells and cell extracts from both recombinant strains, E. coli, and wild-typeSphingomonas sp. strain BN6. The whole cells showed less than 2% of the specific activities found with cell extracts. These results suggested that the cytoplasmic anaerobic “azo reductases,” which have been described repeatedly in in vitro systems, are presumably flavin reductases and that in vivo they have insignificant importance in the reduction of sulfonated azo compounds.

Synthesis, antioxidant and antibacterial activity of azo dye-stilbene hybrid compounds

2019 ◽  
Vol 48 (1) ◽  
pp. 84-88 ◽  
Author(s):  
Esmail Rezaei-Seresht ◽  
Aboulfazl Salimi ◽  
Behnam Mahdavi
Keyword(s):  
Antioxidant Activity ◽  
Antibacterial Activity ◽  
Azo Dyes ◽  
Radical Scavenging ◽  
Coupling Reaction ◽  
Inhibition Zone ◽  
Antibacterial Activities ◽  
Butylated Hydroxytoluene ◽  
Azo Compounds ◽  
Content Type

Purpose The purpose of this paper is synthesis and evaluation of antioxidant and antibacterial activities of a series of new azo dyes derived from 4-aminostilbene. Design/methodology/approach First, the starting material 4-aminostilbene was prepared via two successive Wittig and reduction reactions from 4-nitrobenzyl bromide. The obtained 4-aminostilbene was then reacted with some phenols under the normal azo coupling reaction conditions to give five new azo products. Antioxidant activity of the azo compounds was determined by radical scavenging assay using 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical. Also, the antimicrobial activity of the compounds against one gram-positive and eight gram-negative strains was evaluated based on the inhibition zone using disc diffusion assay. Findings The structures of the azo dyes were identified and characterized by fourier-transform Infrared, 1H nuclear magnetic resonance (NMR) and ultraviolet-visible (UV-V) is spectroscopic methods. All the compounds showed higher antioxidant activity than ascorbic acid (Asc) and butylated hydroxytoluene (BHT) as positive controls. Moreover, the compounds showed lower antibacterial activity than the standard antibiotic vancomycin. Research limitations/implications Excellent antioxidant activity, along with antibacterial activity against Streptococcus pneumoniae and Pseudomonas aeruginosa, was observed for the two synthesized azo dyes. Originality/value Five novel azo dyes based on 4-aminostilbene were synthesized. The dyes have a highly p-extended conjugated structure comprising the phenolic and stilbenic segments, and they indicated good antioxidant activity, so that the two dyes (2c and 2d) even showed much more scavenging activity compared to BHT which is used as an antioxidant agent in food industries. These compounds with highest antioxidant activity also inhibited the growth of S. pneumoniae and P. aeruginosa.

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