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Acid Orange 7

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Acid Orange 7 Basic information

Product Name:
Acid Orange 7
Synonyms:
  • Golden Orange Ⅱ
  • Orange II sod
  • Orange II, Pure
  • ORANGE1
  • ORANGE I
  • NAPHTHOL ORANGE
  • TROPAEOLIN 000 NO 1
  • TROPAEOLIN OOO-1
CAS:
633-96-5
MF:
C16H11N2NaO4S
MW:
350.32
EINECS:
211-199-0
Product Categories:
  • Organics
  • Azo
Mol File:
633-96-5.mol
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Acid Orange 7 Chemical Properties

Melting point:
164°C
solubility 
Solubility Very soluble in water; very slightly soluble in ethanol
pka
8.26, 11.4(at 25℃)
Colour Index 
15510
form 
Crystalline Powder
color 
Green to blue
Odor
Odorless
PH Range
Amber (7.4) to orange (8.6);Orange (10.2) to red (11.8)
Water Solubility 
116 g/L (30 ºC)
λmax
483nm
Merck 
14,6858
BRN 
3898201
Biological Applications
Cosmetics; wound dressing materials
Major Application
Organic light emitting diodes (OLEDs), nanoparticles, inks, wood preservatives, textiles, hair dyes, cosmetics, wound dressing materials, biofuel cells
CAS DataBase Reference
633-96-5(CAS DataBase Reference)
EPA Substance Registry System
C.I. Acid Orange 7, monosodium salt (633-96-5)
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Safety Information

Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
26-36-37/39
WGK Germany 
3
RTECS 
DB7084000
HS Code 
32041200

MSDS

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Acid Orange 7 Usage And Synthesis

Chemical Properties

Orange-red powder

Purification Methods

Purification is as for Orange I. Its solubility in H2O is 40g/L at 25o. [Müller et al. Helv Chim Acta 35 2579 1952.] Also purify it by extracting it with a small volume of cold water, then crystallising it by dissolving in boiling water, cooling to ca 80o, adding two volumes of EtOH and cooling. When cold, the precipitate is filtered off, washed with a little EtOH and dried in air. It can be salted out from aqueous solution with sodium acetate, then repeatedly extracted with EtOH. Meggy and Sims [J Chem Soc 2940 1956], after crystallising the sodium salt twice from water, dissolved it in cold water (11mL/g) and added conc HCl to precipitate the acid dye which was separated by centrifugation, redissolved and again precipitated with acid. After washing the precipitate three times with 0.5M acid, it was dried over NaOH, recrystallised twice from absolute EtOH, washed with a little Et2O, dried over NaOH and stored over conc H2SO4 in the dark. It can then be converted to the pure salt with the calculated amount of NaOH or Na2CO3. [Beilstein 16 IV 408.]

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