1.01307

Titan yellow (C.I. 19540)

metal indicator, Reag. Ph Eur

• Synonym(s): Titan yellow (C.I. 19540), Clayton yellow, Naphthamine G, Thiazole yellow
• Empirical Formula (Hill Notation): C₂₈H₁₉N₅Na₂O₆S₄
• CAS Number: 1829-00-1
• Molecular Weight: 695.72
• MDL number: MFCD00013091
• UNSPSC Code: 12352107
• EC Index Number: 217-377-4
• NACRES: NB.21

Properties

• product name: Titan yellow (C.I. 19540), indicator Reag. Ph Eur
• agency: reag. Ph. Eur.
• Quality Level: 200
• form: solid
• loss: ≤8% loss on drying, 110°C
• pH: 5.1 (20 °C, 10 g/L in H₂O)
• mp: >300 °C (decomposition)
• solubility: 29 g/L
• bulk density: 310 kg/m³
• λmax: 398-402 nm (buffer pH 7.0)
• storage temp.: 2-30°C
• InChI: 1S/C28H21N5O6S4.2Na/c1-15-3-13-21-23(25(15)42(34,35)36)40-27(29-21)17-5-9-19(10-6-17)31-33-32-20-11-7-18(8-12-20)28-30-22-14-4-16(2)26(24(22)41-28)43(37,38)39;;/h3-14H,1-2H3,(H,31,32)(H,34,35,36)(H,37,38,39);;/q;2*+1/p-2
• InChI key: CZIRZNRQHFVCDZ-UHFFFAOYSA-L

Description

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λ_max. (buffer pH 7.0): 398 - 402 nm
Spec. Absorptivity A 1%/1cm (λ_max; 0.01 g/l; buffer pH 7.0; calc. on dried substance): ≥ 350
Transition range: pH 12.0 - pH 13.0Yellow - orange
Loss on drying (110 °C): ≤ 8 %
Suitability as reagent (for magnesium): passes test

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 3
• flash_point_f: Not applicable
• flash_point_c: Not applicable