1.59270

Methylene blue (C.I. 52015)

redox indicator, Reag. Ph Eur

• Synonym(s): Methylene Blue trihydrate, Methylthioninium chloride, 3,7-Bis(dimethylamino)phenothiazinium chloride, Tetramethylthionine chloride
• Empirical Formula (Hill Notation): C₁₆H₁₈ClN₃S · 3H₂O
• CAS Number: 7220-79-3
• Molecular Weight: 373.90
• Beilstein/REAXYS Number: 3599847
• MDL number: MFCD00012111
• UNSPSC Code: 12352107
• EC Index Number: 200-515-2
• NACRES: NA.05

Properties

• product name: Methylene blue (C.I. 52015), Reag. Ph Eur
• agency: reag. Ph. Eur.; suitable for SM 4500 - NH3
• Quality Level: 200
• form: powder
• potency: 1180 mg/kg LD₅₀, oral (Rat)
• loss: 10-15% loss on drying, 110 °C
• color: dark green
• pH: 3 (20 °C, 10 g/L in H₂O)
• mp: 190 °C (dec.) (lit.)
• solubility: 50 g/L
• bulk density: 400‑600 kg/m³
• λmax: 660-665 nm at 50% in ethanol
• storage temp.: 2-30°C
• SMILES string: [Cl-].CN(C)c1ccc2N=C3C=C\C(C=C3Sc2c1)=[N+](/C)C
• InChI: 1S/C16H18N3S.ClH/c1-18(2)11-5-7-13-15(9-11)20-16-10-12(19(3)4)6-8-14(16)17-13;/h5-10H,1-4H3;1H/q+1;/p-1
• InChI key: CXKWCBBOMKCUKX-UHFFFAOYSA-M

Description

Analysis Note

Appearance: Dark green powder, eventually with granular and bright parts.
Identity (UV/VIS-Spectrum): passes test
Absorption maximum λ_max. (ethanol 50 %): 660 - 665 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.003 g/l; ethanol 50 %): 2250 - 2750
Loss on drying (110 °C): 10 - 15 %

Safety Information

• pictograms: GHS07
• signalword: Warning
• hcodes: H302
• pcodes: P264 - P270 - P301 + P312 - P501
• Hazard Classifications: Acute Tox. 4 Oral
• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable