Direct black 91

CAS: 6739-62-4

Ref. 3D-FD145992

Product Information

• Name: Direct black 91
• Synonyms: Benzo Cuprol Black RLW, Benzoic acid, 2-(2-(2-amino-6-(2-(4'-(2-(3-carboxy-4-hydroxyphenyl)diazenyl)-3,3'-dimethoxy(1,1'-biphenyl)-4-yl)diazenyl)-5-hydroxy-7-sulfo-1-naphthalenyl)diazenyl)-5-nitro-, sodium salt (1:3), Benzoic acid, 2-[[2-amino-6-[[4′-[(3-carboxy-4-hydroxyphenyl)azo]-3,3′-dimethoxy[1,1′-biphenyl]-4-yl]azo]-5-hydroxy-7-sulfo-1-naphthalenyl]azo]-5-nitro-, trisodium salt, Cuprophenyl Black RL, Trisodium 2-[[2-Amino-6-[4-[4-(3-Carboxylato-4-Hydroxy-Phenyl)Azo-3-Methoxy-Phenyl]-2-Methoxy-Phenyl]Azo-5-Hydroxy-7-Sulfonato-1-Naphthyl]Azo]-5-Nitro-Benzoate, trisodium 2-{(E)-[(6E)-2-amino-6-(2-{4'-[(2Z)-2-(3-carboxylato-4-oxocyclohexa-2,5-dien-1-ylidene)hydrazinyl]-3,3'-dimethoxybiphenyl-4-yl}hydrazinylidene)-5-oxo-7-sulfonato-5,6-dihydronaphthalen-1-yl]diazenyl}-5-nitrobenzoate, C.I. Direct Black 21, trisodium salt, C.I. Direct Black 91, C.I. 30400, C.I. Direct Black 91, C.I. Direct Black 91, trisodium salt

Description

Direct black 91 is a diazo dye that is used as a pigment in inks, paints and plastics. The congener has an electronic spectrum with the following features:

N-N=C-C=N

The alkali metal atom (Na, K) is situated at the centre of the molecule. There are two integer values for the number of carbon atoms (2). The organic solvent is a polar solvent, such as alcohols or ethers. The chromophore is a salicylic acid group. The particle size is greater than 10 micrometres. The substance has a low viscosity and light resistance. It also exhibits surfactant properties and can be mixed with other substances to create dispersions or emulsions.

• Brand: Biosynth

Chemical properties

• Molecular weight: 902.69 g/mol
• Formula: C₃₈H₂₅N₈Na₃O₁₃S
• Purity: Min. 95%
• Color/Form: Solid