Alizarin Yellow R

Structural formula
General
Surname	Alizarin Yellow R
other names	2-Hydroxy-5 - [(4-nitrophenyl) diazenyl] benzoic acid ( IUPAC ) CI Mordant Orange 1 CI 14030
Molecular formula	C 13 H 9 N 3 O 5
Brief description	dark brown powder
External identifiers / databases
CAS number 2243-76-7 1718-34-9 ( sodium salt ) EC number 218-818-3 ECHA InfoCard 100.017.109 PubChem 15588 ChemSpider 21159613 Wikidata Q2695590
properties
Molar mass	287.23 g mol −1
Physical state	firmly
Melting point	253.5 ° C
solubility	soluble in water and ethanol
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 302-319 P: 305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Alizaringelb R is a yellow azo dye which can be produced from salicylic acid and diazotized 4-nitroaniline via the azo coupling .

In addition to methyl red , methyl orange and other azo dyes and Alizarin Yellow R is a color indicator at pH - titration used. Starting from a low pH value, the color changes from light yellow to orange-red in the range from 10.0 to 12.0.

Despite its name, Alizarin Yellow R is not one of the alizarin dyes or alizarin derivatives that are derived from anthraquinone .

Individual evidence

1. ↑ ^{a b c} Mordant Orange 1 data sheet at Sigma-Aldrich , accessed on January 7, 2013 ( PDF ).
2. ↑ External identifiers of or database links to sodium 2-hydroxy-5 - [(4-nitrophenyl) diazenyl] benzoate : CAS number: 1718-34-9, EC number: 217-002-4, ECHA - InfoCard: 100.015.457 , PubChem : 15587 , ChemSpider : 21106082 , Wikidata : Q72492737 .
3. ↑ Entry on Alizarin Yellow R in the ChemIDplus database of the United States National Library of Medicine (NLM) .
4. ↑ Ram Wasudeo Sabnis: Handbook of Acid-Base Indicators . CRC Press, 2007, ISBN 0-8493-8218-1 , pp. 18 ( limited preview in Google Book search).
5. ↑ Entry on indicators. In: Römpp Online . Georg Thieme Verlag, accessed on January 28, 2016.