4’- -azobenzene-4-sulfonic acid

Di azobenzene Sulfonic Acid. See Benzenediazonium Sulfonic Acid in Vol 2 , p B57-L... 

Once substituents are introduced on even one aromatic ring, these two systems deviate. Thus structure (III) becomes azobenzene-4-sulfonic acid in... 

Analogous membranes have been prepared from poly(L-glutamic acid) containing about 14 mol % azobenzene-sulfonate groups in the side chains (Scheme 3, Structure IV). 25 109 The polypeptide was adsorbed onto a porous support and the hydro-... 

Photocontrol of the transport property was also studied for poly(L-glutamic acid) membrane with azobenzene-4-sulfonic acid residues [61]. 

According to a preliminary report, diimide can be generated at 0° by the action of sodium hydroxide on chloroacetylhydrazide hydrochloride (which see). Another precursor is hydroxylamine-O-sulfonic acid (which see). Azobenzene has been reduced quantitatively to hydrazobenzene and tdlyl alcohol to propanol (70%). ClCHjCONHNHi HCl + 2 NaOH ----------> CH2=C=0 + HjO + HN=NH + 2 NaCff... 

Hydroxy-3-(oxomethyl)azobenzene-4 -sulfonic acid b. Dl-hydroxyphenols... 

CAS 6408-78-2 EINECS/ELINCS 229-068-1 Synonyms 1-Amino-9,10-dioxo-4-phenylamino-9,10-dihydroanthracene-2-sulfonic acid, sodium salt 2-Anthracenesulfonic acid, 1-am i no-9,10-d i hyd ro-9,10-d i oxo-4-(phenylamino)-, monosodium salt Cl 62055 Classification Azobenzene Empirical C2oHi4N2NaOsS Properties M.w. 417.39 Toxicology Irritating to eyes, skin, and respiratory system TSCA listed Uses Dye for wool, silk, polyamide, leather, and soaps... 

CAS 5858-39-9 EINECS/ELINCS 227-490-0 Synonyms Acid red 4, monosodium salt Cl 14710 4-Hydroxy-3-(2-methoxyphenylazo) naphthalene-1-sulfonic acid, sodium salt 1-Naphthalenesulfonic acid, 4-hydroxy-3-((2-methoxyphenyl) azo)-, monosodium salt Classification Azobenzene Empirical Ci7Hi4N2Na05S Properties M.w. 381.35 Toxicology TSCA listed Uses Dye for wool, paper Manuf./Distnb. Aldrich http //www.sigma-aidrich.com, Sigma... 

CAS 1658-56-6 EINECS/ELINCS 216-760-3 Synonyms Cl 15620 Ext. D C Red. no. 8 Fast red A 4-(2-Hydroxynaphthalen-1-ylazo) naphthalene-1-sulfonic acid, sodium salt 4-((2-Hydroxy-1 -naphthalenyl) azo)-1 -naphthalene sulfonic acid sodium salt 1-Naphthalenesulfonic acid, 4-((2-hydroxy-1-naphthalenyl) azo)-, monosodium salt Red no. 506 Rocceline Roccelline Solid red A Classification Azobenzene Empiricai C2oHi4N2Na04S Properties M.w. 401.41 m.p. 280 C Toxicoiogy Mutagen TSCA listed Storage Store in cool, dry place keep container closed when not in use... 

A satisfactory isolation procedure has been described recently by Stdn et al. (755). After refiuxing silk fibroin for 8 hours with concentrated hydrochloric acid, the bulk of the acid is removed by vacuum distillation and treatment with lead acetate. Tyrosine is removed, the concentrated filtrate is treated with a solution of 5-nitronaphthalene-l-sulfonic acid dihydrate and the slightly soluble glycine naphthalene sulfonate is removed. Methyl cellosolve and a solution of azobenzene-p-sulfonic acid trihydrate are added, the suspension is filtered and the precipitate of L-alanine azobenzene sulfonate is treated with barium acetate. The suspension of barium azobenzene sulfonate is filtered and the L-alanine obtained from the filtrate is recrystallized from aqueous ethanol see p. 359. 

The photochemical and photophysical behavior of azobenzene adsorbed on polymer or silica films has been reported recently " azobenzene adsorbed in water-swollen Nafion-H+ (Nafion is a polymer consisting of a perfluorinated backbone and short pendant chains terminated by sulfonic acid groups) exhibited strong fluorescence. The irradiation resulted in the formation of benzo[c]cinnoline and benzidine in quantitative yield, while azobenzene incorporated into a methanol-swollen Nafion-H+ membrane did not emit fluorescence but merely underwent E,Z-isomerization. Thus, solvent-swollen Nafion is useful in the selective phototransformation of azobenzene. According to the authors, protonated azobenzene molecules are located at the fluorocarbon/water interface in water-swollen Nafion-H+ Z-Azobenzene formed on these membranes resulted in cychzation to give the observed products (Scheme 52). 

Azinodi(3-ethylbenzothiazoline)sulfonic acid, see A-00462 ,o -Azoanisole, in D-00514 /7,/7 -Azoanisole, in D-00516 Azo-azohydroxy BN, see A-00465 Azo-azoxy AN, A-00464 Azo-azoxy BN, A-00465 Azo-azoxy PMP, A-00466 Azobenzene-4-carboxylic acid, A-00467 Azobenzene-4-sulfonic acid, A-00468 4,4 -Azobis[3-hydroxy-2,7-... 

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