1-(4-Nitrophenylazo)-2-naphthol
Para Red
CAS: 6410-10-2
Molecular Formula: C16H11N3O3
1-(4-Nitrophenylazo)-2-naphthol - Names and Identifiers
| Name | Para Red |
| Synonyms | Para Red C.I. 12070 C.I. Pigment Red 1 LABOTEST-BB LT00454132 C.I. Pigment Red 1 (8CI) 1-(4-NITROPHENYLAZO)-2-NAPHTHOL 1-(P-NITROPHENYLAZO)-2-NAPHTHOL 1-(4-Nitrophenylazo)-2-naphthol 1-((4-nitrophenyl)azo)-2-naphtho 1-[(4-nitrofenyl)diazenyl]-2-naftol 1-((4-nitrophenyl)azo)-2-naphthaleno 1-[(4-nitrophenyl)azo]-2-naphthaleno 1-(P-NITROPHENYLAZO)-2-NAPHTHOL PARA RED 2-Naphthalenol, 1-(2-(4-nitrophenyl)diazenyl)- 1-[(4-nitrophenyl)hydrazono]naphthalen-2(1H)-one (1Z)-1-[(4-nitrophenyl)hydrazono]naphthalen-2(1H)-one (1E)-1-[(4-nitrophenyl)hydrazono]naphthalen-2(1H)-one |
| CAS | 6410-10-2 |
| EINECS | 229-093-8 |
| InChI | InChI=1/C16H11N3O3/c20-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)19(21)22/h1-10,17H/b18-16+ |
1-(4-Nitrophenylazo)-2-naphthol - Physico-chemical Properties
| Molecular Formula | C16H11N3O3 |
| Molar Mass | 293.28 |
| Density | 1.2211 (rough estimate) |
| Melting Point | 248-252 °C |
| Boling Point | 435.13°C (rough estimate) |
| Flash Point | 249.8°C |
| Solubility | DMSO (Slightly, Heated) |
| Vapor Presure | 9.94E-10mmHg at 25°C |
| Appearance | neat |
| Color | Red |
| BRN | 680469 |
| pKa | 13.45±0.50(Predicted) |
| Storage Condition | Sealed in dry,Room Temperature |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Refractive Index | 1.6500 (estimate) |
| MDL | MFCD00003908 |
| Physical and Chemical Properties | solubility: slightly soluble in hot toluene and boiling ethanol; Magenta in concentrated sulfuric acid, yellow-red precipitate after dilution; Vermilion in case of concentrated nitric acid; it is a purple solution in an alcoholic solution of potassium hydroxide. hue or color: Dark Red relative density: 1.47-1.50 Bulk density/(lb/gal):12.2-12.5 melting point/℃:256 (in toluene) particle shape: Rod shape pH value/(10% slurry):5.5-6.5 oil absorption/(g/100g):47-53 hiding power: translucent reflection curve:  |
| Use | The pigment is commonly known as para-red, giving a dark brown-red color. Compared with the same kind of azo pigment, the pigment has low solvent resistance and poor light fastness, adding a small amount of titanium dioxide, the light fastness is further significantly reduced, and the acid/alkali, soap and other sensitive, mainly used in low-cost printing ink and art coloring. |
1-(4-Nitrophenylazo)-2-naphthol - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S24/25 - Avoid contact with skin and eyes. S36 - Wear suitable protective clothing. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. |
| WGK Germany | 3 |
| RTECS | QL4510000 |
| TSCA | Yes |
| HS Code | 29270000 |
1-(4-Nitrophenylazo)-2-naphthol - Introduction
Insoluble in water, soluble in transparent alkaline solution, extremely soluble in ethanol and benzene.
Last Update：2022-10-16 17:27:40
1-(4-Nitrophenylazo)-2-naphthol - Reference Information
| Color index | 12070 |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Overview | Para-red is a color-developing pigment that is a dark-red solid, darkening color above 120 °c. Melting Point 256 °c. Insoluble in water, slightly soluble in hot toluene and hot ethanol, soluble in hot aqueous sodium hydroxide solution (10%), usually from p-nitroaniline after diazotization, in an ice bath with β-naphthol reaction. |
| purpose | , detection of residual amount of Para red in complex samples, such as soy sauce, |
Last Update：2024-04-09 20:52:54
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Multiple Specifications
Product Name: Para Red Visit Supplier Webpage Request for quotationCAS: 6410-10-2
Tel: 18301782025
Email: 3008007409@qq.com
Mobile: 18021002903
QQ: 3008007409
Wechat: 18301782025
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