O-Phenanthroline CAS#66-71-7
Highly Effective Analytical Reagent – Widely used for the determination of metal ions such as ferrous iron, palladium, vanadium, copper, and iron.
Reliable Redox Indicator – Functions as a sensitive redox indicator in chemical and analytical applications.
Good Solubility in Organic Solvents – Easily soluble in ethanol, benzene, and acetone, supporting versatile laboratory and industrial use.
Stable Crystalline Form – Appears as a white crystalline powder with defined melting points, ensuring convenient handling and storage.
Products Description of O-Phenanthroline CAS#66-71-7
1,10-Phenanthroline monohydrate is an organic intermediate that appears as a white crystalline powder. It is commonly used as a redox indicator and as a reagent for the determination of metal ions such as ferrous iron, palladium, vanadium, copper, and iron.
The monohydrate form has a density of 1.10. Its melting point is 93–94°C, while the anhydrous form melts at 117°C. It is soluble in about 300 parts of water and 70 parts of benzene, and is also soluble in ethanol, benzene, and acetone, but insoluble in petroleum ether.
o-Phenanthroline Chemical Properties
| Melting point | 114-117 °C(lit.) |
| Boiling point | >330°C |
| Density | 1.1836 (rough estimate) |
| Refractive index | 1.5200 (estimate) |
| Fp | >330°C |
| Storage temp | Store below +30°C. |
| Solubility | 2.69g/l |
| Pka | 4.84(at 25℃) |
| Form | Powder |
| Color | White to light yellow or light pink |
| Water Solubility | slightly soluble |
| Sensitive | Hygroscopic |
| Merck | 147214 |
| BRN | 126461 |
| Stability | Stable. Hygroscopic. Store under nitrogen. Incompatible with strong acids, strong oxidizing agents. |
| InChIKey | DGEZNRSVGBDHLK-UHFFFAOYSA-N |
| CAS DataBase Reference | 66-71-7(CAS DataBase Reference) |
| NIST Chemistry Reference | o-Phenanthroline(66-71-7) |
| EPA Substance Registry System | 1,10-Phenanthroline (66-71-7) |
Safety Information
| Hazard Codes | T,N |
| Risk Statements | 25-50/53 |
| Safety Statements | 45-60-61 |
| RIDADR | UN 2811 6.1/PG 3 |
| WGK Germany | 3 |
| RTECS | SF8437000 |
| TSCA | Yes |
| HazardClass | 6.1 |
| PackingGroup | III |
| HS Code | 29339990 |
| Toxicity | dni-hmn:leu 5 mg/L ONCOBS 46,193,89 |
Product Application of O-Phenanthroline CAS#66-71-7
1,10-Phenanthroline is a widely used ligand in the spectroscopic determination of metals and in spectroscopic studies related to CO₂ reduction. It is also applied in cross-linking reactions of organic boric acids catalyzed by Cu(II). In addition, it functions as a redox indicator and as a reagent for the determination of titanium and iron.
This compound readily forms coordination complexes with metals such as iron, copper, cobalt, and nickel, as well as with 2,2′-bipyridine, and produces a red complex with Fe²⁺. It can be oxidized by potassium permanganate to yield 2,2′-dipyridyl-3,3′-dicarboxylic acid. Furthermore, it is used as a quantitative colorimetric reagent for copper and iron and serves as an indicator in the titration of iron salts with cerium sulfate.
