Thiazol Yellow G
Title: Thiazol Yellow G
CAS Registry Number: 1829-00-1
CAS Name: 2,2¢-(1-Triazene-1,3-diyldi-4,1-phenylene)bis[6-methyl-7-benzothiazolesulfonic acid] disodium salt
Additional Names: C.I. Direct Yellow 9; 2,2¢-[(diazoamino)di-p-phenylene]bis[6-methyl-7-benzothiazolesulfonic acid] disodium salt; C.I. 19540; Chlorazol Yellow 2G; Clayton yellow; Diazamine Golden Yellow T; Titan yellow
Molecular Formula: C28H19N5Na2O6S4
Molecular Weight: 695.72
Percent Composition: C 48.34%, H 2.75%, N 10.07%, Na 6.61%, O 13.80%, S 18.44%
Literature References: Prepn from 2-(p-aminophenyl)-6-methyl-7-benzothiazolesulfonic acid ("dehydrothio-p-toluidinesulfonic acid"): Beilstein vol. 27, 2nd suppl, 509; F. J. Welcher, Organic Analytical Reagents vol. 4 (Van Nostrand, New York, 1948) p 391; H. King et al., Analyst 92, 695 (1967). See also: Colour Index vol. 2 (3rd ed., 1971) p 2010; H. J. Conn's Biological Stains, R. D. Lillie, Ed. (Williams & Wilkins, Baltimore, 9th ed., 1977) p 371.
Properties: Yellowish-brown powder. Sol in water, or alc (yellow solns), NaOH (reddish-yellow soln), H2SO4 (brownish-yellow soln). Protect from light.
Use: Dyeing cotton, viscose rayon, natural silk; as biological stain; as an analytical reagent, most often for the determination of Mg; as pH indicator, yellow 11.0 to red 13.0; as fluorescent dye for microscopy.

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