Cresol Red
Product name: Cresol red
Synonym(s): o-Cresolsulfonphthalein, Cresol red
CAS Number: 1733-12-6
Introduction
| Quality Level | 200 |
| form | solid |
| loss | ≤5% loss on drying, 110°C |
| visual transition interval | 0.5-2.5, pink to brownish-yellow(1st transition range) 6.5-8.5, yellow to purple(2nd transition range) |
| mp | 290 °C (decomposes) |
| bulk density | 600‑620 kg/m3 |
| storage temp. | 2-30°C |
| SMILES string | [S]1(=O)(=O)OC(c4c1cccc4)(c3cc(c(cc3)O)C)c2cc(c(cc2)O)C |
| InChI | 1S/C21H18O5S/c1-13-11-15(7-9-18(13)22)21(16-8-10-19(23)14(2)12-16)17-5-3-4-6-20(17)27(24,25)26-21/h3-12,22-23H,1-2H3 |
| InChI key | OBRMNDMBJQTZHV-UHFFFAOYSA-N |
Analysis Note
1st transition range: pH 0.5 – pH 2.5pink – brownish yellow
2nd transition range: pH 6.5 – pH 8.5yellow – purple
Appearance of solution: passes test
Loss on drying (110 °C): ≤ 5
Sensitivity test: passes test
