α-Naphtholbenzein
ALDRICH/291099 - indicator grade
Synonym: 4,4′-(α-Hydroxybenzylidene)di-1-naphthol; p-naphtholbenzein
CAS Number: 145-50-6
Empirical Formula (Hill Notation): C27H18O2
Molecular Weight: 374.43
EC Number: 205-656-3
Linear Formula: C27H18O2
Product Type: Chemical
| ε (extinction coefficient) | ≥50000 at 207-213 nm in methanol at 0.01 g/L |
| application(s) | diagnostic assay manufacturing hematology histology |
| color | faintly Faint Brown to Very Dark Brown to Very Dark Red and Black |
| form | powder |
| grade | indicator grade |
| InChI | 1S/C27H18O2/c28-25-16-14- |
| InChI key | VDDWRTZCUJCDJM-PNHLSOANSA |
| mp | 230-235 °C (lit.) |
| pH | 0.0, green |
| 0.8, yellow | |
| 10.0, blue-green | |
| 8.2, yellow | |
| SMILES string | Oc1ccc(C(c2ccccc2)=C3C= |
| storage temp. | room temp |
| Application: | α-Naphtholbenzein has been used as an indicator during sequential injection analysis technique done for acid-base titrations. |
| General description: | α-Naphtholbenzein is a dye belonging to the Benzein family insoluble in water and soluble in alcohol. α-Naphtholbenzein is primarily used as an indicator for pH range 8.2-10.0 (mostly in acid-base titrations), causing a color change for the neutral solutions turning alkaline. Its applications include detection of bacterial growth in packed food, viable cells, enzymes, ammonia odors in patients with bacterial infection, and many more. |
| Packaging: | 5, 25 g in glass bottle |
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 26 |
| RIDADR | NONH for all modes of transport |
| WGK Germany | WGK 3 |
| Flash Point(F) | Not applicable |
| Flash Point(C) | Not applicable |
| mp | 230-235 °C (lit.) |
| Storage Temp. | room temp |
| UNSPSC | 12171500 |