Azo compounds

Introduction: Diazonuim salts are unsaturated compounds which have a trible bond. There was a scientist his name was Griess, this scientist gave Diazo name to diazonuim salts as he thought that two hydrogen atoms in the benzene ring will be replaced by two atoms of nitrogen. Diazonuim salts divided into two types of salts: Aromatic diazonuim salts and alephatic ( non- aromatic) diazonuim salts. Non aromatic salts are less important than aromatic. Under normal conditions, diazonuim salt is highly

the aluminum foil or silica. When placed in a in a puddle of solvent that moves up the plate, the different inks i.e. the solution will move up the place based on their Rf values. Adherence increases with increasing polarity, so the less polar compounds will be carried farther by the solvent. Eventually the dyes will separate into their compontnets, which can be visibly seen. This is then used to determine who the ink of the unsigned note belonged to along with the pen that it belonged

The dye studied in this experiment comes from a group of dyes called azo dyes. These dyes are arranged as two aromatic rings connected by two double-bonded nitrogen atoms (R-N=N-R). The two nitrogen atoms being double bonded together cause the color that the dye produces. Azo violet is also used in labs as a pH indicator because of the fact that it turns from an yellow-orange color in acidic and neutral environments (and also when used as a dye) to a deep purple in basic environments. The amount

In this experiment, stereochemistry was observed. Azo violet is a compound that contains an azo group. This group is comprised of a N=N double bond. Therefore, due to its extensive conjugation within the molecule, it is highly colored and used in the textile industry as a dye frequently. For this experiment, the azo violet will be synthesized and a diazonium coupling reaction will occur. A diazonium coupling is an electrophilic aromatic substitution where the electrophile is the terminal nitrogen

purpose of this experiment was to prepare azo dyes using the combinatorial approach to show the principles combinatorial chemistry. Using combinatorial synthesis, an array of chemicals can be synthesized by using a parallel synthesis to identify potentially valuable compounds. This electrophilic aromatic substitution reaction involved multiple steps to complete, however, no major techniques were used; only the use of a hot place and an ice bath. The specific azo dyes produced in this experiment used

Azo Violet 5. Introduction In this experiment, azo violet was produced from resorcinol and p-nitroaniline. First a diazonium salt was produced from p-nitroaniline in hydrochloric acid and sodium nitrite. Second, the azo violet was synthesized from the diazonium salt and resorcinol. After synthesis, the dye was tested on a piece of cotton. It was also determined if differences in pH changed the solutions. 6. Data and Results With the dye test, the dyed cotton was orange when compared to the undyed

(complete decolorization in 2 h), while in sterile, cell free medium decolorization did not occur up to 48 h of incubation suggesting the absence of abiotic decolorization. As RO16 showed complete decolorization in 2 h, this industrially important toxic azo dye was taken for further studies. Lysinibacillus sp. RGS could decolorize RO16 rapidly and thus was found to be better than the bacterial consortium DAS reported by Jadhav et al (2011). To confirm the decolorization, UV-Vis spectroscopic analysis was

3.1. DYES AND CHEMICALS Six reactive azo dyes namely, Reactive Violet 5, Reactive Red 2, Reactive Orange 16, Reactive Blue 4, Reactive Black 5 and Reactive Green 19A were generous gifts from Colors India Inc. Pvt. Ltd. Ahmedabad, India. All these dyes were of industrial grade and are widely used in textile industries. Reactive Violet 5 (vinyl sulfone as a reactive group) and Reactive Red 2 (triazin as a reactive group) were used as model azo dyes in this study. All required chemicals and solvents

These colours were known as naphtols. They were produced directly on the fibre by applying on the fibre, a compound which included amino and hydroxyl groups (usually hydroxyl derivatives of naphthalene were used). These compounds were then reacted with a diazotised base or salt at low temperature to produce an insoluble coloured molecule within the fibre. These naphthol colours had good overall fastness. However, they

Experiment 14: Azo Violet Discussion In this experiment, azo violet, a popular orange dye, was synthesized through an electrophilic aromatic substitution of resourcinol with a diazonium salt. The product was analyzed by performing a dyeing test, in which cotton was dyed orange, and by performing a pH test, which should have produced orange product in acid, and purple product in base. Originally, dyes were clothing were mostly obtained from plant and animal products, and were both expensive and limited