7782-78-7Relevant articles and documents
Synthesis and antimicrobial activities of some novel thiophene containing azo compounds
Fondjo, Emmanuel Sopbue,Tsemeugne, Joseph,De Dieu Tamokou, Jean,Djintchui, Arnaud Ngongang,Kuiate, Jules Roger,Sondengam, Beibam Luc
, p. 253 - 259 (2013)
A series of new thienylazothiophenes were prepared by coupling reactions of diazotized thienocoumarins with their corresponding free amines. The structures of the products 3-7 were assigned on the basis of their elemental and spectroscopic data. The HMBC and HSQC techniques were used in some cases to ascertain the structural assignments. The antimicrobial screenings of compounds 3-7 along with substituted 2-aminothiophenes 1a,b were performed against three bacteria and three fungal species and their activities compared to those of nystatin, gentamycin and ciprofloxacin used as reference drugs. It was found that the antimicrobial activities of the tested new hybrid compounds were in some cases equal or better than those of the reference drugs.
Chemiluminescence properties of isoluminol related mono azo disperse dyes: Experimental and DFT based approach to photophysical properties
Deshmukh, Mininath S.,Sekar, Nagaiyan
, p. 127 - 134 (2015)
A six novel isoluminol derivatives containing azo unit were synthesized by coupling different N,N-disubstituted anilines with the diazotized 5-nitro and 7-nitro-6-amino-2,3-dihydrophthalazine-1,4-dione. The chemiluminescent properties were studied in hydrogen peroxide, potassium hexacyanoferrate(III) and sodium hydroxide solution. The chemiluminescence properties were compared with the standard isoluminol systems it was observed that the chemiluminescence properties of the novel derivatives were nearly same to isoluminol. The geometries of the synthesized disperse dyes for their azo and hydrazone tautomeric forms were optimized using density functional theory and their electronic excitation properties were evaluated using density functional theory and time dependent density functional theory.
A combined experimental and DFT investigation of mono azo thiobarbituric acid based chalcone disperse dyes
El-Sadany, Samir K.,El-atawy, Mohamed A.,Hamed, Ezzat A.,Mahmoud, Mona N.,Omar, Alaa Z.
, (2020/10/08)
A number of monoazo dyes were synthesized by the reaction of 4-aminoacetophenone with different substituted benzaldehydes to give a new series of chalcone derivatives. The diazonium salts of these chalcones then allowed to react with thiobarbituric acid to produce the appropriate azo dye. The structures of the newly synthesized dyes were assigned by IR, NMR spectral data. IR study confirmed the existence of azo-dioxothioxo tautomer in the solid phase while 1H NMR study indicated the predominance of azoenol-oxothioxo or hydrazo-dioxothioxo tautomers. The geometries of the azo and hydrazo tautomeric forms and their electronic absorption of the dyes were optimized at B3LYP/6-311G level of theory. All the azo compounds were evaluated for their dyeing performance on polyester fibers, and PET. All the synthesized dyes gave moderate to excellent fastness properties on PET fiber. The effects of the nature of the substituents on the color and dyeing properties of these dyes have been evaluated. The mechanism of dyeing polyester fiber was discussed.
Synthesis, characterization, pharmacological evaluation and molecular docking studies of benzothiazole azo derivatives
Harisha,Keshavayya, Jathi,Prasanna,Joy Hoskeri
, (2020/06/08)
A series of novel benzothiazole based azo dyes were synthesized and fully characterized by using different analytical techniques. The antioxidant activity of synthesized azo dyes was studied with the DPPH, hydrogen peroxide, metal chelating and nitric oxide radical methods and compared with the known antioxidant ascorbic acid. Further, the anticancer properties of synthesized azo dyes were carried out against breast cancer (MCF-7) cell lines by MTT assay and results revealed that the synthesized compounds exhibited good anticancer property in micro-molar range. Additionally, the anti-inflammatory activities of target compounds were also investigated by protein denaturation method and were found to have effective anti-inflammatory property. In order to predict the binding modes and binding affinity of synthesized compounds, they were docked into the active sites of protein B-cell lymphoma-extra-large (Bcl-xL) to predict their anticancer property. The synthesized compounds were found to have good affinity for B-cell lymphoma-extra-large (Bcl-xL). A good correlation was found between in-silico docking analysis and in biological screening of all synthesized azo dyes with less binding energies and higher inhibition constants value against the target protein.
On the Reaction of 2-Benzylamino-1,4-naphthoquinones with Nitrosylsulfuric Acid
Gornostaev,Nuretdinova,Lavrikova,Khalyavina, Yu. G.,Fominykh,Gatilov, Yu. V.
, p. 608 - 614 (2019/07/17)
The reaction of 2-benzylamino-1,4-naphthoquinone with nitrosylsulfuric acid in acetic acid results in preferential formation of 2,1- and 2,3-heterocyclization products: (E)-4-(hydroxyimino)-2-phenylnaphtho [2,1-d]oxazol-5(4H)-one and 2-phenyl-1-hydroxy-1H-naphtho[2,3-d]imidazole-4,9-dione. In addition, 2-phenylnaphtho[2,1-d]oxazol-4,5-dione and N-(3-nitro-1,4-dioxo-1,4-dihydronaphthalen-2-yl)benzamide are also formed. The reaction of 2-benzylamino-3-chloro-1,4-naphthoquinone with nitrosylsulfuric acid in acetic acid gives 3-diazonapthalene-1,2,4(3H)-trione and benzaldehyde.
Anhydrous Dinitrogen Trioxide Solutions for Br?nsted Acid Free Nitrous Acid Chemistry
Rosadiuk, Kristopher A.,Bohle, D. Scott
, p. 5461 - 5465 (2017/12/26)
Dinitrogen trioxide, N2O3, is readily prepared and stabilized in high concentrations in dry organic solvents at normal working temperatures. These conditions allow for facile acid and water free nitrosation and nitration reactions fo
Synthesis and absorption abilities of pyrazolo[5,1-c][1,2,4]triazine-based disperse dyes
Karc?,Karci
, p. 457 - 465 (2013/07/26)
A series of 13 novel pyrazolo[5,1-c][1,2,4]triazine-based disperse dyes was synthesized by heating ethyl pyrazolylhydrazonocyanoacetate in glacial acetic acid. Solvent and acid-base influences on the wavelength of maximum absorption have been studied.
Etching silicon with HF-HNO3-H2SO4/H 2O mixtures- unprecedented formation of trifluorosilane, hexafluorodisiloxane, and Si-F surface groups
Lippold, Marcus,Boehme, Uwe,Gondek, Christoph,Kronstein, Martin,Patzig-Klein, Sebastian,Weser, Martin,Kroke, Edwin
, p. 5714 - 5721 (2013/02/25)
The etching behaviour of sulfuric-acid-containing HF-HNO3 solutions towards crystalline silicon surfaces has been studied over a wide range of H2SO4 concentrations. For mixtures with low sulfuric acid concentration, NO2/N2O4, N 2O3, NO and N2O have been detected by means of FTIR spectroscopy. Increasing concentrations of nitric acid lead to high etching rates and to an enhanced formation of NO2/N2O 4. Different products were observed for the etching of silicon with sulfuric-acid-rich mixtures [c(H2SO4) > 13 mol L -1]. Trifluorosilane and hexafluorodisiloxane were identified by FTIR spectroscopy as additional reaction products. In contrast to the commonly accepted wet chemical etching mechanism, the formation of trifluorosilane is not accompanied by the formation of molecular hydrogen (according to Raman spectroscopy). Thermodynamic calculations and direct reactions of F 3SiH with the etching solution support an intermediate oxidation of trifluorosilane and the formation of hexafluorodisiloxane. The etched silicon surfaces were investigated by diffuse reflection FTIR and X-ray photoelectron spectroscopy (XPS). Surprisingly, no SiH terminations were observed after etching in sulfuric-acid-rich mixtures. Instead, a fluorine-terminated surface was found.
Azo compounds and coating compositions containing the azo compounds
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, (2008/06/13)
Disclosed are azo colorant compounds containing one or more ethylenically-unsaturated groups polymerizable or copolymerizable with ethylenically-unsaturated compositions typically used in coating compositions. The azo colorantcompounds are polymerizable by photopolymerization or free radical polymerization techniques with ethylenically-unsaturated monomers. The copolymerized colorants produce colored compositions such as colored acrylic polymers, e.g., polymers produced from acrylate and methacrylate esters, colored polystyrenes, and similar colored polymeric materials derived from other ethylenically-unsaturated monomers. The ethylenically-unsaturated colorant compounds may be used in coatings that are applied to wood, glass, metal, thermoplastics and the like.
Dye composition
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Example 4, (2010/01/31)
The invention provides a dye composition for dyeing fibers comprising (a) an azo dye of formula (II) or a salt thereof, and (b) an azo dye of formula (III) or a salt thereof. The invention provides navy and black dye compositions, especially suitable for dyeing secondary cellulose acetate fibers, with superior fastness properties than known navy/black dyes. Preferably, the α-crystal form of dye (III) is used, which has greater solubility and achieves quicker dyeing than the commonly-used β and γ forms of (III) when dyeing cellulose acetate at 60-95° C. A new method of making the α form is disclosed.
