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CAS No 482-89-3 , Indigo Search by region : China

  • Name: Indigo
  • Synonyms: 2-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-3H-indol-3-one; Vat Blue 1; 2,2'-Bis(2,3-dihydro-3-oxoindolylidene); C.I. 73000; Indigo blue;Indigo;
  • CAS Registry Number:
  • Transport: 50kgs
  • Melting Point: 390-392 ºC (DEC.)
  • Flash Point: 158.2°C
  • Boiling Point: 400.4°Cat760mmHg
  • Density: 1.417g/cm3
  • Refractive index: 1.709
  • Water Solubility: <0.1 G/100 ML
  • Safety Statements: R36/37/38
  • Hazard Symbols: Xi: Irritant;
  • Flash Point: 158.2°C
  • EINECS: 207-586-9
  • Molecular Weight: 262.27
  • InChI: InChI=1/C16H10N2O2/c19-15-9-5-1-3-7-11(9)17-13(15)14-16(20)10-6-2-4-8-12(10)18-14/h1-8,17-18H/b14-13+
  • Risk Statements: S26;S36
  • Molecular Formula: C16H10N2O2
  • Molecular Structure:CAS No:482-89-3 Indigo

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References of Indigo
Title: Indigo
CAS Registry Number: 482-89-3
CAS Name: 2-(1,3-Dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-3H-indol-3-one
Synonyms: [D2,2￠-biindoline]-3,3￠-dione; D2,2￠-bipseudoindoxyl; indigotin; indigo blue; D & C Blue No. 6; C.I. Pigment Blue 66; C.I. Vat Blue 1; C.I. 73000
Molecular Formula: C16H10N2O2
Molecular Weight: 262.26
Percent Composition: C 73.28%, H 3.84%, N 10.68%, O 12.20%
Literature References: Probably the oldest known coloring matter. Originally obtained from various species of Indigofera, Leguminosae, indigenous to Bengal, Java, Guatemala, in which it occurs as a glucoside. First synthesis: Baeyer, Ber. 11, 1296 (1878); 12, 456 (1879). First commercial process: Heumann, Ber. 23, 3043, 3431 (1890). Newer prepns: Harley-Mason, J. Chem. Soc. 1950, 2907; Ziegler, Kappe, Monatsh. Chem. 96, 889 (1965); J. Gosteli, Helv. Chim. Acta 60, 1980 (1977). Indigo occurs in cis and trans forms, in solid state it is in the trans form: Posner, Ber. 56, 31 (1923); 57, 1313 (1924); 59, 1799 (1926). Reviews on indigo and indigoid dyes: Lubs, The Chemistry of Synthetic Dyes, ACS Monograph Series no. 127 (Reinhold, New York, 1955) pp 551-576; Schweizer, Künstliche Organische Farbstoffe und ihre Zwischenprodukte (Springer Verlag, 1964) pp 320-334; Colour Index vol. 4 (3rd ed., 1971) p 4595.
Properties: Dark-blue powder with coppery luster. Sublimes at about 300°; dec 390°. Practically insol in water, alcohol, ether, and dil acids. Dissolves in nonpolar solvents with red and in polar solvents with blue color. With fuming H2SO4 it forms a sol sulfonic acid.
Use: As textile dye. In sutures.