Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Quinophthalone dyes

Blue Dyes with Red or Near-Infrared Fluorescence. These are less important than the above types and are of little importance industrially. Indeed, whilst the blue-green fluorescence of a yellow dye and the red fluorescence of a red dye increase the visual attractiveness of the dyes by making them brighter, a blue dye with red fluorescence is visually weird. [Pg.109]

Near-Infrared Dyes with Near-Infrared Fluorescence. This type is becoming more important, particularly in biomedical applications (see Chapter 6). Phthalo-cyanines and cyanines provide this type of fluorescence. [Pg.109]

Like the hydroxy azo dyes, quinophthalone dyes can, in theory, exhibit tautomer-ism. Because the dyes are synthesised by the condensation of quinaldine derivatives (1) with phthalic anhydride, they are often depicted as structure (2), but this is incorrect, since the two single bonds prevent any conjugation between the two halves of the molecule. [Pg.109]

Quinophthalones provide important dyes for the coloration of plastics, e.g., C.I. Solvent Yellow 33 (3, R = H), and for the coloration of polyester. C.I. Disperse Yellow 54 (3, R = OH) is the leading yellow dye for the transfer printing of polyester. [Pg.110]


Quinophthalon dyes Quinoline yellow Xanthene dyes Erythrosine (see below)... [Pg.605]

Quinoline yellow (E 104, Cl Food Yellow 13) is a quinophthalone dye consisting of a mixture of disulfonates (minimum 80%), monosulfonates (maximum 15%), and trisulfonates (maximum 7%) as sodium salts, obtained by the sulfonation of 2-(2-quinolyl)-l,3-indandione. The calcium and potassium salts are also permitted. Quinoline yellow is a yellow powder or granules, soluble in water, sparingly soluble in ethanol. The absorption maximum is at 411 nm in aqueous acetic acid solution, pH 5, = 865. It is not permitted as food colorant in the US. "... [Pg.612]

A recent patent discloses the synthesis of quinobenzazepine 286a, together with two isomers (ll-carboxylic acid and quinophthalone dye 286b) (10JAK143896). [Pg.116]

Quinophthalone Dyes. Currently, 3 -hydroxyquinophthalone [7576-65-0] is employed extensively in a number of product lines used to dye synthetic fibers in greenish yellow hues with good lightfastness and generally sufficient sublimation-fastness. Suitable substitution in the phthalic acid residue or the quinoline nucleus may improve thermosetting fastness [29], An example is C.I. Disperse Yellow54, 47020 [7576-65-0] (10) ... [Pg.139]

Quinoline Yellow is a quinophthalone dye consisting essentially of a mixture of monosulfonates, disulfonates (principal component), and trisulfonates, and subsidiary coloring... [Pg.499]

HPLC is often reported to be the technique of best choice for the quantification of food colorants. According to European Directive 94/36/EC, the quantities of synthetic colorants to be added to foods are restricted and thus reliable methods for their quantification must be established. Approved colorants, defined by E-coded numbers (Table 6.6.2), are permitted for non-alcoholic beverages, confectionery products, and even for caviar (dying fish roe). For example, a specific HPLC chromatographic method for the quantization of 14 synthetic food colorants belonging to azo dye, triphenyhnethane, or quinophthalone classes (E 102,104, 110, 122,123, 124, 127, 128, 129, 131, 132, 133, 142, 151) was reported to check their contents in caviar. ... [Pg.541]

There are no clear advantages in terms of functional performance between the two classes of dyes, except that phthalocyanines are generally more light stable but tend to be more expensive to synthesize and modify. Phthalocyanine dyes are not suitable for DVD-R media, since the main chromophore cannot readily be modified to produce a sufficiently large hypsochromic shift. Other dyes potentially suitable for DVD-R include metal azo complexes, quinophthalones, and diphenyl-methanes. The cyanine dyes are particularly useful as they can be readily modified to tailor the optical absorbance requirements for all current optical disk recording applications.199... [Pg.610]

The name of this structural class ( quinoline ) in the Colour Index is not ideal because quinoline derivatives feature in other related classes, such as the methine basic dyes with a quinolinium cationic group. The class is more precisely associated with quinophthalone (1.15), the characteristic chromogen derived by condensation of quinoline derivatives with phthalic anhydride. This small class of yellow compounds contributes to the disperse, acid, basic and solvent ranges of dyes. [Pg.9]

Quinophthalone (6.229) and its derivatives [86] also fall into the methine category, although they appear in the Colour Index under quinoline colouring matters. The parent compound was discovered in 1882 by Jacobsen, who condensed 2-methylquinoline (quinaldine) with phthalic anhydride. The product, quinoline yellow, is used as a solvent dye (Cl Solvent Yellow 33). The light fastness is improved by the presence of a hydroxy group in the quinoline ring system. Derivatives of this type provide greenish yellow disperse dyes for polyester. The moderate sublimation fastness of Cl Disperse Yellow 54 (6.230 R = H) is improved by the introduction of an adjacent bromine atom in Cl Disperse Yellow 64 (6.230 R = Br). [Pg.351]

E. Jacobson in 1882 fused phthalic anhydride with quinoline bases obtained from coal tar, which also contained quinaldine (136). He thus received quinophthalone (137). Quinophthalone derivatives bearing sulfonic or carboxylic acid functions represent suitable anionic dyes. Derivatives carrying basic side chains containing quarternary nitrogen, on the other hand, provide cationic dyes. The compounds are used especially as disperse dyes [1]. [Pg.537]

Quinophthalones, made by the condensation of phthalic anhydride with quinaldine derivatives, are one snch gronp, exemplified by Cl Disperse Yellow 54 (2.17a) and Yellow 64 (2.17b) nsed for polyester, especially for transfer printing and also as solvent dyes. [Pg.95]

Solvent dyes are really intermediate between dyes and pigments being insoluble in water but soluble in solvents, especially hydrocarbons. Structurally many solvent dyes bear a close similarity and relationship with disperse dyes. The Colour Index has an issne on Solvent Dyes, where several hundred dyes are described, unfortunately many of the strnctnres remain confldential. The structures of the disclosed dyes range from very simple monoazo dyes, e.g. Cl Solvent Yellow 14 (2.78) to the higher performing anthraquinones, e.g. Cl Solvent Yellow 163 (2.79) and Blue 36 (2.80), quinophthalones... [Pg.131]

Industrially applied disperse dyes are based on numerous chromophore systems. Approximately 60 % of all products are azo dyes, and ca. 25 % are anthraqui-none dyes, with the remainder distributed among quinophthalone, methine, naphthalimide, naphthoquinone, and nitro dyes [9],... [Pg.135]

Yellow Dyes. A yellow D2T2 dye is probably the easiest to obtain both in terms of color and properties. The leading transfer-printing yellow dyes for textiles, such as quinophthalones and azophenols, are inadequate, as are typical photographic yellows such as azamethines. Two of the most widely used dye classes are methine (12) and especially azopyridones (13) [7,11,12],... [Pg.553]


See other pages where Quinophthalone dyes is mentioned: [Pg.837]    [Pg.783]    [Pg.9]    [Pg.161]    [Pg.522]    [Pg.317]    [Pg.332]    [Pg.51]    [Pg.109]    [Pg.109]    [Pg.522]    [Pg.482]    [Pg.317]    [Pg.484]    [Pg.837]    [Pg.783]    [Pg.9]    [Pg.161]    [Pg.522]    [Pg.317]    [Pg.332]    [Pg.51]    [Pg.109]    [Pg.109]    [Pg.522]    [Pg.482]    [Pg.317]    [Pg.484]    [Pg.835]    [Pg.225]    [Pg.654]    [Pg.783]    [Pg.5]    [Pg.5]    [Pg.337]    [Pg.835]    [Pg.110]    [Pg.98]    [Pg.337]    [Pg.835]    [Pg.228]    [Pg.835]   
See also in sourсe #XX -- [ Pg.116 ]

See also in sourсe #XX -- [ Pg.109 ]




SEARCH



Disperse Quinophthalone Dyes

Quinophthalon

Quinophthalon dyes

Quinophthalon dyes

Quinophthalone

Quinophthalones

© 2024 chempedia.info