scholarly journals Substituent Effects on Absorption Spectra of 7-Amino-4-Hydroxynaphthalene-2- Sulfonic Acid Based Dyes

2020 ◽  
Vol 24 (7) ◽  
pp. 124-1251
Author(s):  
O.R.A. Iyun ◽  
J.O. Egbe ◽  
G.Y. Kantiok
Keyword(s):  
Salicylic Acid ◽  
Sulfonic Acid ◽  
Diazonium Salt ◽  
Substituent Effects ◽  
Coupling Agents ◽  
Acid Dye ◽  
Melting Points ◽  
Optimum Time ◽  
Optimum Ph ◽  
Diazonium Coupling

The synthesis of dyes derived from coupling 7-amino-4-hydroxynaphthalene-2-sulfonic acid (a diazonium salt) with different coupling agents (phenol, p-nitrophenol, vanillin and salicylic acid) respectively yielded four different dyes namely; Dye A, 4-hydroxy-7-((2- hydroxyphenyl)diazenyl)naphthalene-2-sulfonicAcid, Dye B, 4-hydroxy-7-((2-hydroxy-5- nitrophenyl)diazenyl)-4-hydroxynaphthalene-2-sulfonic Acid, Dye C, 7-((2-formyl-5-hydroxy-4-methoxyphenyl)diazenyl)-4- hydroxy naphthalene-2-sulfonic Acid and Dye D, 2-hydroxy-6-((5-hydroxy-7-sulfonaphthalene-2-yl)diazenyl)benzoic Acid. The wavelengths of maximum absorption of the dyes were determined in different solvents; water, DMF, ethanol and acetone, their λmax was between 510-600nm. The synthesized dyes were characterized using IR and their melting points determined. The dyes were applied on wool and silk and the effect of pH, time, temperature on the %exhaustion for both fabrics was determined. The optimum pH for absorption of the dyes on both fabrics was 3 & 5, optimum time 50, 75 & 90 minutes and optimum temperature75 and 90oC depending on the dye and type of fabric. The Fastness (wash, rub and light) properties of the dyes were also assessed. Keywords: Diazonium, coupling, exhaustion, fastness

Infrared spectra of aqueous sodium benzoates and salicylates in the carboxyl-stretching region: chelation in aqueous sodium salicylates

1969 ◽  
Vol 47 (24) ◽  
pp. 4577-4588 ◽  
Author(s):  
G. E. Dunn ◽  
R. S. McDonald
Keyword(s):  
Salicylic Acid ◽  
Carbon Tetrachloride ◽  
Infrared Spectra ◽  
Aromatic Compounds ◽  
Deuterium Oxide ◽  
Substituent Effects ◽  
Good Evidence ◽  
Frequency Region ◽  
Aqueous Sodium ◽  
Substituent Constants

Infrared spectra in the frequency region 1300–1760 cm−1 are reported for 41 substituted sodium benzoates and 10 substituted sodium salicylates in deuterium oxide solution, and for 9 substituted salicylic acids in chloroform and carbon tetrachloride solutions. Carboxylate stretching frequencies of benzoates and salicylates correlate poorly with substituent constants, but the asymmetric frequencies of benzoates and salicylates correlate well with each other, and the asymmetric frequencies of benzoates correlate well with the asymmetric frequencies of the corresponding nitrobenzenes. It is suggested that, among substituted aromatic compounds, group vibrations which couple with the ring vibrations may correlate well with similar vibrations of other groups, but not with coupled vibrations of different symmetry, uncoupled vibrations, or substituent constants. Chelation in chloroform solutions of salicylic acid dimers can be detected by its influence on substituent effects, but infrared spectra provide no good evidence for chelation in aqueous sodium salicylates.

scholarly journals The role of benzoate secreted by Desulfotomaculum acetoxidans DSM 771 in sulfate uptake.

2005 ◽  
Vol 52 (4) ◽  
pp. 797-802
Author(s):  
Lucyna Pawłowska-Cwiek ◽  
Ryszard Pado
Keyword(s):  
Salicylic Acid ◽  
Hydrogen Sulfide ◽  
Aromatic Compound ◽  
Spectrum Analysis ◽  
Cell Walls ◽  
Sulfonic Acid ◽  
Sulfate Uptake ◽  
Diammonium Salt ◽  
Benzoate Derivatives

This work was designed to find the cause of the delay in hydrogen sulfide dissimilation in Desulfotomaculum acetoxidans DSM 771, which is dependent on the sulfate uptake. This bacterium grown without addition of any aromatic compound was shown by spectrum analysis with the methylene method to contain hydroxy-benzoate derivatives. The presence of these compounds was confirmed by HPLC in fractions obtained from cell walls after 15 days of culture. The test with 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt seemed to indicate the presence of peroxidase, which probably oxidized benzoate to its hydroxy derivatives. The test with 5-sulfo-salicylic acid proved the ability of the investigated strain to utilize arylsulfates and to reduce sulfate group to hydrogen sulfide. On the basis of the above data, we propose the following sequence of reactions: 1, benzoate secretion; 2, benzoate hydroxylation; 3, sulfonation of hydroxy-benzoate derivatives.

scholarly journals PENJERAPAN ZAT WARNA SINTETIS MENGGUNAKAN KARBON AKTIF KELAPA SAWIT DAN PENGEMBANGANNYA SEBAGAI BAHAN AJAR

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Efa Susanti ◽  
M.Lutfi Firdaus ◽  
Sumpono Sumpono
Keyword(s):  
Critical Thinking ◽  
Activated Carbon ◽  
Palm Oil ◽  
Contact Time ◽  
Thinking Skills ◽  
Critical Thinking Skills ◽  
Optimum Time ◽  
Optimum Ph ◽  
Optimum Wavelength

This study aims to: (1) explain the ability of the active carbon absorption of Palm Oil Palm as a dye adsorbent Reactive Red and Direct Green (2) determines the pH, contact time, and weight of the optimum adsorbent and the influence of temperature using activated carbon. Reactive Red and Direct Green dyestuffs. (3) to explain the influence of video media usage on the improvement of learning result and critical thinking ability of students in Chemistry class XI MIPA E at SMAN 2 Kota Bengkulu. The procedure in this study is the activation of activated carbon of palm oil and activated, activated carbon characterization using FTIR, Determination of maximum wavelength (?), Calibration curve creation, Adsorption of substance by activated carbon of palm oil: determining pH, contact time, adsorbent weight, , adsorption isotherms, Determination of temperature effect, Adsorption Isotherm Determination, Determination of adsorption kinetics, Applications on dyestuffs. The data were analyzed. The result of pH variation, variation of adsorbent weight, and contact time were made curve so that pH, adsorbent weight, concentration and optimum contact time were obtained using Excel program. Using ANAVA one way, followed by KR-20 test and one sample t test. The results showed that there were: reactive red optimum wavelength 496 nm, optimum pH 3, optimum time 40 min, absorbent weight 150 mg, maximum absorbency KAPKS 32,73 mg / gr and direct green optimum wavelength 613 nm, with optimum pH 5, optimum time 40 minutes, absorbent weight 150 mg, maximum absorbency KAPKS 32.825 mg / gr. there is an increase of chemistry learning outcomes during the enrichment hours or outside of class hours and critical thinking skills of grade XI IPA E SMAN2 Kota Bengkulu using audio-visual media with average pretest score of 75 and average post test score 82.27 with four criteria critical thinking skills are less critical by 26%, critical enough 43%, critical 23% and very critical at 8%.

Elaboration of a chemical sensor based on polyaniline and sulfanilic acid diazonium salt for highly sensitive detection nitrite ions in acidified aqueous media

2018 ◽  
Vol 4 (7) ◽  
pp. 1024-1034 ◽  
Author(s):  
Abdoulaye Diarisso ◽  
Modou Fall ◽  
Noureddine Raouafi
Keyword(s):  
Aqueous Medium ◽  
Sulfonic Acid ◽  
Chemical Sensor ◽  
Diazonium Salt ◽  
Aqueous Media ◽  
Sulfanilic Acid ◽  
Sensitive Detection ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

The work describes the use of sulfonic acid-functionalized GCE as a scaffold to build a highly sensitive PANI-based sensor for nitrite ions in aqueous medium.

Grafting polymer–protein bioconjugate to boron-doped diamond using aryl diazonium coupling agents

2013 ◽  
Vol 40 ◽  
pp. 60-68 ◽  
Author(s):  
Zakaria Salmi ◽  
Aazdine Lamouri ◽  
Philippe Decorse ◽  
Mohamed Jouini ◽  
Amine Boussadi ◽  
...  
Keyword(s):  
Coupling Agents ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Diazonium Coupling

Substituent effects on azo coupling of indoles

1993 ◽  
Vol 71 (12) ◽  
pp. 2144-2149 ◽  
Author(s):  
Hassan A. Albar ◽  
Ahmad S. Shawali ◽  
Magda A. Abdaliah
Keyword(s):  
Diazonium Salt ◽  
Substituent Effects ◽  
General Mechanism ◽  
Coupling Reactions ◽  
Azo Coupling ◽  
Straight Line ◽  
Reaction Constant ◽  
Methyl Derivatives ◽  
Rate Limiting ◽  
Kinetics Of

The kinetics of the azo coupling of eight para-substituted benzenediazonium tetrafluoroborates 2a–h with indole and its 1-, 2-,and 3-methyl derivatives 1a–d, respectively, were studied in acetonitrile at 25 °C under pseudo-first-order conditions. The relation k1(obs) = k2[diazonium salt] was found applicable in all cases. The logarithms of the rate constants k2 for each reaction series were correlated by the Hammett equation. A plot of the values of the reaction constant, ρ, obtained against the acidity constants pKa of 1a–d gave a straight line: ρ = 2.97 – 0.15 pKa. These results indicate that the azo-coupling reactions of indoles 1a–d follow one general mechanism involving rate-limiting initial electrophilic attack at the 3-position for all four compounds, contrary to the previous conclusion of Jackson and Lynch that the final deprotonation step is rate limiting.

4,4′-(Diazoamino)-bis(5-methoxy-2-methylbenzenesulfonic Acid): Preparation and Determination in FD&C Red No. 40

1976 ◽  
Vol 59 (1) ◽  
pp. 5-11
Author(s):  
John E Bailey ◽  
Elizabeth A Cox
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Quantitative Determination ◽  
High Pressure Liquid Chromatography ◽  
Sulfonic Acid ◽  
Sodium Acetate ◽  
Diazonium Salt

Abstract 4,4′-(Diazoamino)-bis(5-methoxy-2-methylbenzenesulfonic acid) (CSAT) has been found in samples of FD&C Red No. 40 submitted for certification, using high-pressure liquid chromatography (HPLC). CSAT is synthesized by diazotizing cresidine sulfonic acid (CSA) and coupling the diazonium salt with undiazotized CSA in the presence of sodium acetate. A method for quantitative determination of CSAT in FD&C Red No. 40, using HPLC and an untested method of correcting for interfering compounds, is presented.

Technical Improvements in Measurement of L-Aspartate: 2-Oxoglutarate Aminotransferase Activity in Serum by Diazonium Salt Coupling

1973 ◽  
Vol 19 (7) ◽  
pp. 776-778 ◽  
Author(s):  
Leo G Morin ◽  
Jerome Prox
Keyword(s):  
Diazonium Salt ◽  
Transaminase Activity ◽  
Aminotransferase Activity ◽  
Glutamic Oxalacetic Transaminase ◽  
Color Development ◽  
Fast Red ◽  
Coupling Procedure ◽  
Diazonium Coupling

Abstract An improved diazonium coupling procedure is described for measurement of L-aspartate: 2-oxoglutarate aminotransferase (EC 2.6.1.1, formerly termed glutamic oxalacetic transaminase) activity in serum. A relatively pH-stable dye, 5-chloro-2-methoxyaniline-1-diazonium chloride (Fast Red RC) is used, with dimethylformamide and methanol to enhance and stabilize color development. A 15-min incubation is part of the procedure, and color development stabilizes within 5 min.

scholarly journals Penjerapan Zat Warna Sintetis Menggunakan Karbon Aktif Kelapa Sawit Dan Pengembangannya Sebagai Bahan Ajar

2017 ◽  
Vol 1 (1) ◽  
pp. 12-18
Author(s):  
Efa Susanti ◽  
M.Lutfi Firdaus ◽  
Sumpono Sumpono
Keyword(s):  
Critical Thinking ◽  
Activated Carbon ◽  
Palm Oil ◽  
Contact Time ◽  
Thinking Skills ◽  
Critical Thinking Skills ◽  
Optimum Time ◽  
Optimum Ph ◽  
Optimum Wavelength

This study aims to: (1) explain the ability of the active carbon absorption of Palm Oil Palm as a dye adsorbent Reactive Red and Direct Green (2) determines the pH, contact time, and weight of the optimum adsorbent and the influence of temperature using activated carbon. Reactive Red and Direct Green dyestuffs. (3) to explain the influence of video media usage on the improvement of learning result and critical thinking ability of students in Chemistry class XI MIPA E at SMAN 2 Kota Bengkulu. The procedure in this study is the activation of activated carbon of palm oil and activated, activated carbon characterization using FTIR, Determination of maximum wavelength (?), Calibration curve creation, Adsorption of substance by activated carbon of palm oil: determining pH, contact time, adsorbent weight, , adsorption isotherms, Determination of temperature effect, Adsorption Isotherm Determination, Determination of adsorption kinetics, Applications on dyestuffs. The data were analyzed. The result of pH variation, variation of adsorbent weight, and contact time were made curve so that pH, adsorbent weight, concentration and optimum contact time were obtained using Excel program. Using ANAVA one way, followed by KR-20 test and one sample t test. The results showed that there were: reactive red optimum wavelength 496 nm, optimum pH 3, optimum time 40 min, absorbent weight 150 mg, maximum absorbency KAPKS 32,73 mg / gr and direct green optimum wavelength 613 nm, with optimum pH 5, optimum time 40 minutes, absorbent weight 150 mg, maximum absorbency KAPKS 32.825 mg / gr. there is an increase of chemistry learning outcomes during the enrichment hours or outside of class hours and critical thinking skills of grade XI IPA E SMAN2 Kota Bengkulu using audio-visual media with average pretest score of 75 and average post test score 82.27 with four criteria critical thinking skills are less critical by 26%, critical enough 43%, critical 23% and very critical at 8%.

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