ChemicalBook > Product Catalog > Dyes and Pigments > Pigment > Organic pigments > 1-(1-naphthylazo)-2-naphthol
1-(1-naphthylazo)-2-naphthol
1-(1-naphthylazo)-2-naphthol Basic information
- Product Name:
- 1-(1-naphthylazo)-2-naphthol
- Synonyms:
-
- 1-(1-naphthylazo)-2-naphthol
- Red 2R
- 2-Naphthalenol, 1-(1-naphthalenylazo)-
- Solvent red 4 (C.I. 12170)
- C.I. Solvent Red 4
- C. I. Pigment Red 40
- 1-(1-Naphtylazo)-2-naphthol
- 1-(1-Naphtylazo)naphthalene-2-ol
- CAS:
- 2653-64-7
- MF:
- C20H14N2O
- MW:
- 298.34
- EINECS:
- 220-176-4
- Product Categories:
-
- Organics
- Mol File:
- 2653-64-7.mol
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1-(1-naphthylazo)-2-naphthol Chemical Properties
- Melting point:
- 230 °C
- Boiling point:
- 530.2±33.0 °C(Predicted)
- Density
- 1.20±0.1 g/cm3(Predicted)
- pka
- 12.03±0.50(Predicted)
- form
- powder to crystal
- color
- Orange to Brown to Dark purple
- CAS DataBase Reference
- 2653-64-7
- EPA Substance Registry System
- 2-Naphthalenol, 1-(1-naphthalenylazo)- (2653-64-7)
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1-(1-naphthylazo)-2-naphthol Usage And Synthesis
Preparation
Naphthalen-1-amine diazotization and Naphthalen-2-ol coupling.
Properties and Applications
yellow red. From toluene in the crystallization product melting point 224 ℃. Soluble in hot ethanol and benzene in red. In concentrated sulfuric acid to red light blue, dilution to red light purple solution, and then have red brown precipitation. Dye ethanol solution to join concentrated hydrochloric acid is dark red; Join concentrated sodium hydroxide solution for bright red light brown. Mainly used in oil, fat and wax, soap coloring.
| Standard | Light Fastness | Heat-resistant(℃) | water | Sodium Carbonate(5%) | Hydrochloric acid(5%) | |
| Melting point | Stable | |||||
| ISO | General | 220 |
150≥ 220
Sublimation |
Insoluble | No change | No change |
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