85-85-8
1-(2-Pyridylazo)-2-naphthol
CAS: 85-85-8
Molecular Formula: C15H11N3O
85-85-8 - Names and Identifiers
| Name | 1-(2-Pyridylazo)-2-naphthol |
| Synonyms | PAN O-PAN 1-(2-Pyridylazo)-2-n 1-Pyridylazo-2-naphthol 1-(2-Pyridylazo)-2-naphtol 1-(2-Pyridylazo)-2-naphthol 2-Naphthol, 1-(2-pyridylazo)- 1-(2-pyridinylazo)-2-naphthaleno 1-(2-Pyridylazo)-2-Hydroxynaphthalene 2-Hydroxy-1-(2-pyridylazo)naphthalene 1-[(E)-2-Pyridinyldiazenyl]-2-naphthol 1-(pyridin-2-yldiazenyl)naphthalen-2-ol 1-[(E)-pyridin-2-yldiazenyl]naphthalen-2-ol 1-(pyridin-2-ylhydrazono)naphthalen-2(1H)-one (1E)-1-(pyridin-2-ylhydrazono)naphthalen-2(1H)-one |
| CAS | 85-85-8 |
| EINECS | 201-637-9 |
| InChI | InChI=1/C15H11N3O/c19-13-9-8-11-5-1-2-6-12(11)15(13)18-17-14-7-3-4-10-16-14/h1-10,19H |
85-85-8 - Physico-chemical Properties
| Molecular Formula | C15H11N3O |
| Molar Mass | 249.27 |
| Density | 1.1469 (rough estimate) |
| Melting Point | 138-141 °C (lit.) |
| Boling Point | 392.37°C (rough estimate) |
| Flash Point | 237.8°C |
| Water Solubility | Insoluble |
| Solubility | Soluble in methanol, ethanol, benzene, ether, chloroform and hot dilute lye, insoluble in water |
| Vapor Presure | 1.92E-09mmHg at 25°C |
| Appearance | Orange red amorphous powder |
| Color | green to red, upon chelation with metal |
| BRN | 206390 |
| pKa | 8.86±0.50(Predicted) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stable. Incompatible with strong oxidizing agents, strong bases. |
| Refractive Index | 1.5700 (estimate) |
| MDL | MFCD00004071 |
| Physical and Chemical Properties | Orange-red amorphous powder. Melting point of 141 ° C, soluble in methanol, ethanol, benzene, ether, chloroform and hot dilute alkali, insoluble in water. The solution was pink at pH 12 and above, orange-red in weak acid and purple in concentrated sulfuric acid. Its metal complex is pink or red. |
| Use | This product is for scientific research only and shall not be used for other purposes. |
85-85-8 - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S37/39 - Wear suitable gloves and eye/face protection |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 29333999 |
85-85-8 - Introduction
Complexation indicator, titrate bismuth, cadmium, copper, gallium, indium, lanthanide, nickel, lead, thorium, thallium (III), uranium, zinc. Precipitation enrichment of trace metals. Photometric determination of cobalt, copper, ferric, gallium, mercury, indium, iridium, manganese, nickel, lead, palladium, rhodium, ruthenium, antimony, titanium, uranium, vanadium, zinc, zirconium and lanthanides.
Last Update：2022-10-16 17:29:21
85-85-8 - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | 1-(2-pyridylazo)-2-naphthol is an indicator of transition metals. 1-(2-pyridylazo)-2-naphthol is an indicator for Complexometric titration and a reagent for extraction and spectrophotometric determination of various transition metals. Dyes and metabolites. This product is an indicator agent for complexation. |
| production method | is obtained by diazotization of 2-aminopyridine followed by coupling with 2-naphthol. Anhydrous ethanol is reacted with metallic sodium to form sodium ethoxide, and then an ethanol solution of 2-aminopyridine is added, and ethyl nitrite vapor is introduced to react at 45-50 °c. The reaction mixture was incubated for 8 hours, and the diazonium salt was filtered off and washed with ether. The diazonium salt is added to the ethanol solution of 2-naphthol, and carbon dioxide is introduced into the coupling reaction at 45-50 ° C. After 6 hours, the crystal is filtered out, washed with distilled water, recrystallized with ethanol, and dried to obtain the finished product. |
Last Update：2024-04-09 21:04:16
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