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| Aniline Yellow | |
|---|---|
| Name | Aniline Yellow |
| Othernames | p-Aminoazobenzene |
| Cas number | 60-09-3 |
| Formula | C12H11N3 |
| Molar mass | 189.24 g·mol−1 |
| Density | 1.18 g·cm−3 (solid) |
| Melting point | 120–121 °C |
| Appearance | orange to yellow crystalline powder |
Aniline Yellow is an organic azo dye historically important in the development of synthetic dyes and modern chemical industry. First synthesized during the 19th century dye revolution, it became a benchmark compound in studies that connected laboratory organic chemistry with commercial manufacturing, industrial chemistry, and regulatory frameworks. The compound has played roles in textile coloration, analytical chemistry, and toxicology debates involving industrial pioneers and regulatory bodies.
Aniline Yellow emerged amid discoveries by William Henry Perkin, August Wilhelm von Hofmann, John Mercer, Charles Goodyear, Justus von Liebig, and contemporaries who transformed coal-tar derivatives into commercial dyestuffs. Early reports linked the compound to experiments conducted in laboratories associated with Royal Society, University of Bonn, University of Manchester, and industrial sites such as facilities owned by BASF, IG Farben, and early dyeworks in Leipzig. The dye’s commercial rise paralleled inventions by Alexander Parkes and market expansion documented in trade reports from London Stock Exchange listings of chemical firms and coverage by periodicals like The Times and Chemical News. Scientific debates about azo coupling and aromatic substitution involved figures connected to Royal Institution, French Academy of Sciences, and conferences where representatives from Siemens and Bayer presented. Regulatory responses to health concerns later involved agencies such as United States Food and Drug Administration, European Chemicals Agency, and national ministries in Germany, United Kingdom, and United States.
Aniline Yellow is chemically p-aminoazobenzene, featuring an azo (-N=N-) linkage between two phenyl rings with a para-amino substituent. Structural studies have been reported in journals associated with Royal Society of Chemistry, American Chemical Society, and institutions like Max Planck Society and Chinese Academy of Sciences. The molecule’s conjugated system produces its characteristic absorption in the visible region; spectroscopic characterization often references methodologies developed at Massachusetts Institute of Technology, Harvard University, and ETH Zurich. Physical constants and crystallography have been determined using instrumentation from labs at CERN collaborations and national synchrotron facilities similar to those at European Synchrotron Radiation Facility and National Institute of Standards and Technology. The compound displays limited solubility in water and greater solubility in organic solvents used in industrial processes overseen historically by firms like DuPont, Rhodia, and Solvay.
Traditional synthesis involves diazotization of para-phenylenediamine derivatives followed by azo coupling with aniline or substituted anilines; methods developed in industrial research centers such as Imperial Chemical Industries and academic groups at University of Paris and University of Cambridge optimized yields and purity. Scale-up practices adopted by manufacturers including Huntsman Corporation, Clariant, and legacy plants of Dow Chemical Company emphasized reactor design, temperature control, and waste treatment influenced by engineering research from Massachusetts Institute of Technology and Stanford University. Modern production incorporates continuous-flow techniques inspired by process intensification research at Max Planck Institute for Coal Research and pilot plants coordinated with European Chemical Industry Council. By-products and effluent streams historically required treatment strategies developed with input from United Nations Environment Programme and national environmental agencies.
Aniline Yellow was used widely as a textile dye in mills in Bradford, Manchester, Lyon, and Bombay (now Mumbai), and in coloration processes practiced by manufacturers linked to Sakichi Toyoda-era textile mechanization in Toyama Prefecture. It served as a reference compound in dye chemistry research at University of Tokyo, Columbia University, and University of Chicago. The dye found applications in inks and printing associated with firms like Heidelberg Druckmaschinen and in biological staining protocols influenced by techniques from Pasteur Institute and laboratories at Johns Hopkins University. Specialized uses included pigment precursor roles in dye-sensitized studies funded by organizations such as National Institutes of Health and European Research Council.
Awareness of potential toxic and carcinogenic properties stemmed from epidemiological and toxicology studies conducted by institutions including National Toxicology Program, International Agency for Research on Cancer, and university research centers at Karolinska Institutet and University of Copenhagen. Occupational exposure incidents documented in case reports affected workers at historic dyeworks in Manchester and industrial sites inspected by inspectors from agencies like Health and Safety Executive and Occupational Safety and Health Administration. Environmental monitoring in waterways near chemical plants has involved agencies such as Environmental Protection Agency and Environment Agency (England), with remediation projects often coordinated with World Health Organization guidelines and local ministries.
Regulatory actions and guidance have involved standards and restrictions developed by bodies such as European Chemicals Agency, United States Environmental Protection Agency, Food and Drug Administration, Health Canada, and national ministries in Japan, Germany, and France. Industry compliance programs at multinational corporations including BASF, DuPont, and Clariant adopted occupational exposure limits and personal protective equipment standards influenced by committees at American Conference of Governmental Industrial Hygienists and consensus standards from International Organization for Standardization. Waste management and discharge limits have been incorporated into permits administered through institutions such as United Nations Environment Programme initiatives and regional authorities in Rhine] basin management] (note: basin authority names such as International Commission for the Protection of the Rhine).
Analytical approaches for Aniline Yellow use spectrophotometry, high-performance liquid chromatography, gas chromatography–mass spectrometry, and tandem mass spectrometry developed and validated by laboratories at National Institute for Occupational Safety and Health, European Reference Laboratory, and university analytical facilities at University of California, Berkeley and University of Oxford. Method standardization efforts referenced technical committees within International Organization for Standardization, cross-validated protocols from United States Pharmacopeia, and ring trials coordinated by reference centers like European Commission Joint Research Centre. Environmental monitoring employs sampling frameworks used by United Nations Environment Programme and applied in field studies in river systems monitored by World Bank-funded projects.
Category:Azo dyes