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The molecules of most coloured organic compounds contain two parts:

Synthesis and Characterization of Azo Dye Para Red and …

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1-[(4-Nitrophenyl)azo]-2-naphthol | C16H11N3O3 | ChemSpider

A solution of another compound such as another aromatic amine or a phenol is then added to the cool solution and produces an azo compound which is coloured. One example is the formation of a red dye when an aqueous solution of 4-aminonaphthalenesulfonic acid (naphthionic acid) is added to a solution of 4-nitrobenzenediazonium chloride to form C.I. Acid Red 74:

Structure, properties, spectra, suppliers and links for: 1-[(4-Nitrophenyl)azo]-2-naphthol.

Basic dyes were amongst the earliest synthetic dyes. Indeed Mauveine is a basic dye. The chromophore is present as a cation and they are used nowadays in dyeing acrylic fibres (usually a co-polymer with propenonitrile (acrylonitrile) and a small amount of a co-monomer which contain sulfonate, -SO3-, and carboxylate, -CO2-, groups). These are ion-ion interactions (Tables 2 and 4).

Azo dyes para red was synthesized

A class of bright cherry-red synthetic organic colorants

This change from trans (preferred) to cis can be effected byexposure to UV radiation. This can lead to photochromism, a light-inducedreversible colour change in some dyes, for example C.I. Disperse Red 1. This effect was considered a nuisance and has largely been eliminated by carefuldevelopment of more stable dyes. But photochromic dyes are beginning tomake a comeback in technology like sunglasses and sunroofs in cars2.

In the multi-step synthesis of Para Red,explain why acetanilide is converted to p-nitroanilinein two steps instead of converting anilinedirectly to p-nitroaniline in one step.

Para red was first synthesized in 1880 by Holliday in England

4-Nitroaniline is a starting material for the synthesis of Para Red, the first azo dye: Toxicity.

All vat dyes are insoluble in water. To apply them to a fibre, for example cotton, they are placed in an alkaline solution (Table 4). The insoluble dye is reduced to form a colourless (leuco) anion which is soluble and possesses affinity for the fibre. This is then adsorbed by the fibre, sometimes in the presence of sodium chloride, conditions similar to that for direct dyes. After the dyeing process the original insoluble parent dye is regenerated within the fibre by oxidation, usually using a solution of hydrogen peroxide or simply air:

Liquid crystals have played an important part in our lives for many years in various forms of information displays e.g. calculators. Initially they could only display differences between light and dark. It was found that by using dyes this contrast could be increased and coloured screens produced. They have now largely replaced the traditional display technologies of light emitting diodes and cathode ray tubes. The dyes used have been specifically designed to change orientation with the liquid crystal molecules and therefore offer a higher intensity of colour. These dyes are said to exhibit dichroism.

Synthesis description for preparation of 4-tert-BUTYLPHENOL
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Synthesis description for preparation of 4-NITROACETANILIDE

A dye in solution is coloured because of the selective absorption of certain wavelengths of light by specific bonds in the molecule. The light that is transmitted is seen by the observer and appears coloured because some of the wavelengths of the visible spectrum are now missing.

Synthesis - Biology of Red Pandas

Where the rings join, they share two carbon atoms and thus naphthalene with two rings has 10 carbon atoms, not 12. Similarly, anthracene has 14 carbon atoms rather than 18. As naphthalene and anthracene contain delocalised electrons over all the rings it is inappropriate to use the delocalised symbol which is used for benzene in the other units, for that would indicate two or three separate delocalised systems. Thus in this unit, Kekule structures are used.

Synthesis and properties of Asante Calcium Red--a …

A series of deep red fluorescent dyes (CR1 to CR3) was developed via introduction of a coumarin moiety into the rhodamine molecular skeleton. The novel dyes possessed the individual advantages of coumarin and rhodamine derivatives, and the emission wavelength was extended to the deep red region (>650 nm) due to the extension of fused-ring conjugate structure simultaneously. To illustrate its value, we designed and conveniently synthesized a series of novel deep red bioimaging dyes (CR1E to CR3E) by esterification of CR1 to CR3, which could selectively stain mitochondria. They were superior to the MitoTrackers for mitochondrial staining in terms of large Stokes shift, excellent contrast for imaging, high photostability, and low cytotoxicity. Furthermore, the fluorescence of the coumarin moiety and rhodamine-like fluorophore could be switched like classical rhodamine. Thus, they could be used as an effective platform in constructing fluorescence sensors. Based on this fact, we constructed a novel ratiometric sensor (CR1S) for Hg2+ with good selectivity that could be successfully applied to the imaging of Hg2+ in living A549 cells. This design strategy is straightforward and adaptable to various deep red dyes and sensing platforms by simply introducing different fluorophores.

Galleries: Mechanism of azo dye Para Red synthesis? (Galleries)

Synthetic procedures for the tetrahalostilbene starting materials, connectivity structure for -1-Ph, full UV−vis and emission spectra for all compounds, including solvatochromism data, HOMO and LUMO surfaces for all compounds, cyclic voltammograms for all compounds, and Cartesian coordinates for computed structures of all compounds. Supplementary crystallographic data for -1-bTh (CCDC ) and -2-Ph () in the form of .cif files. This material is available free of charge via the Internet at .

Fourier Series Applet - Falstad

The chemical nature of a dye is determined by the chemical and physical properties of the fibres of the textile to be coloured. The four main types of fibres (Table 1) are protein, cellulosic, regenerated (based on cellulose or derivatives) and synthetic.

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