138-28-3 Usage
Uses
Used in Dye and Pigment Synthesis:
3-Methoxy-4-amino azo benzene-3'-sulfonic acid is used as a key intermediate in the synthesis of dyes and pigments for various applications, including coloring textiles, plastics, and other materials. Its color-changing properties in response to pH variations make it a preferred choice for creating pH-sensitive dyes.
Used as a pH Indicator:
In the laboratory and industrial settings, 3-Methoxy-4-amino azo benzene-3'-sulfonic acid is utilized as a pH indicator due to its color-changing behavior in different pH environments. This feature is crucial for monitoring and controlling pH levels in various chemical processes.
Used in the Production of Color Photographs:
3-Methoxy-4-amino azo benzene-3'-sulfonic acid is employed in the photography industry for the production of color photographs. Its ability to produce a range of colors makes it an essential component in the development of photographic films and prints.
Used in the Textile Industry:
In the textile industry, 3-Methoxy-4-amino azo benzene-3'-sulfonic acid is used as a dyeing agent for fabrics. Its colorfastness and ability to produce vibrant hues make it a popular choice for dyeing a wide range of textiles, from clothing to home furnishings.
Used in the Pharmaceutical Industry:
3-Methoxy-4-amino azo benzene-3'-sulfonic acid is utilized as an intermediate in the synthesis of various medications in the pharmaceutical industry. Its chemical properties allow for the development of new drugs and the improvement of existing ones.
It is important to handle 3-Methoxy-4-amino azo benzene-3'-sulfonic acid with care, as it may have harmful effects on human health and the environment if not properly managed. Safe handling and disposal practices should be followed to minimize potential risks.
Check Digit Verification of cas no
The CAS Registry Mumber 138-28-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,3 and 8 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 138-28:
(5*1)+(4*3)+(3*8)+(2*2)+(1*8)=53
53 % 10 = 3
So 138-28-3 is a valid CAS Registry Number.
InChI:InChI=1/C13H13N3O4S/c1-20-13-8-10(5-6-12(13)14)16-15-9-3-2-4-11(7-9)21(17,18)19/h2-8H,14H2,1H3,(H,17,18,19)/b16-15+
138-28-3Relevant academic research and scientific papers
WATER-SOLUBLE AZO COMPOUNDS OR SALTS THEREOF, INK COMPOSITIONS AND COLORED PRODUCTS
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Page/Page column 17, (2009/09/26)
The present invention relates to a water-soluble azo compound or a salt thereof represented by the following formula (1): (wherein, R represents a hydrogen atom, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms or a sulfo group, n, m, x and y represent an integer of 1 or 2, 1 to 3, 2 to 4 and 1 to 3, respectively.) and an ink composition containing the same; the above compound or a salt thereof has a hue possessing a high vividness suitable for inkjet recording, provides various fastnesses to recorded matters, and is useful as a yellow coloring matter excellent in storage stability when prepared into an ink composition, and suitable for ink compositions, especially inks for inkjet recording.
DYE FOR ANISOTROPIC DYE FILM, DYE COMPOSITION FOR ANISOTROPIC DYE FILM, ANISOTROPIC DYE FILM AND POLARIZING DEVICE
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Page/Page column 34, (2008/06/13)
An anisotropic dye film having high dichromatic properties is provided. An anisotropic dye film wherein the period d attributable to molecular stacking is at most 3.445 ?, and the column length L thereof is at least 105 ?. The anisotropic dye film preferably has a degree of orientation of the molecular stacking axes of at least 85% and a film thickness of at most 30 μm, and is formed by a wet film-forming method. Since it has a molecular alignment suitable to develop a dichroic ratio, it provides high dichromatic properties. A polarizing element having this anisotropic dye film is excellent in heat resistance, light fastness and polarizing performance.
