Molecule structure of C.I. Direct Yellow 11 (CAS NO.1325-37-7):

IUPAC Name: Disodium 6-oxo-5-[(4-sulfonatophenyl)hydrazinylidene]naphthalene-2-sulfonate 
Molecular Weight: 452.36934 g/mol
Molecular Formula: C₁₆H₁₀N₂Na₂O₇S₂ 
Stability: Stable. May be flammable.
H-Bond Donor: 1
H-Bond Acceptor: 9
Rotatable Bond Count: 2
Tautomer Count: 4
Exact Mass: 451.972481
MonoIsotopic Mass: 451.972481
Topological Polar Surface Area: 156
Heavy Atom Count: 29
Canonical SMILES: C1=CC(=CC=C1NN=C2C3=C(C=CC2=O)C=C(C=C3)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]
InChI: InChI=1S/C16H12N2O7S2.2Na/c19-15-8-1-10-9-13(27(23,24)25)6-7-14(10)16(15)18-17-11-2-4-12(5-3-11)26(20,21)22;;/h1-9,17H,(H,20,21,22)(H,23,24,25);;/q;2*+1/p-2
InChIKey: TXVRKNUZLYFDTJ-UHFFFAOYSA-L
EINECS: 215-393-6
Product Categories: Dyes and Pigments

 C.I. Direct Yellow 11 is used for dyeing of paper and cotton silk fabrics.

Hazard Codes: Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.

 C.I. Direct Yellow 11 (CAS NO.1325-37-7) is also named as Airedale Yellow RD ; Alkaline condensation of 4-nitrotoluene-2-sulfonic acid ; Amanil Fast Yellow AN ; Atlantic Stilbene Yellow GA ; Azine Fast Yellow A ; Azomine Yellow R ; Bencidal Fast Yellow X ; Benzanil Yellow R ; Benzenesulfonic acid, 2-methyl-5-nitro-, alk. cond. products ; Benzo Fast Yellow A ; CI 40000 ; CI Yellow 11 ; Calcomine Yellow 2G ; Carta Yellow G ; Carta Yellow G 180 ; Chlorazol Paper Yellow R ; Chrome Eather Yellow TG ; Direct Fast Yellow AC ; Direct Fast Yellow R ; Direct Orange G ; Erie Yellow A ; Erie Yellow F ; Nankai Direct Fast Yellow A ; Naphthalene Leather Yellow GL ; Nippon Fast Yellow A ; Paper Yellow RF ; Paramine Fast Yellow GR ; Tetrodirect Yellow A ; Trisulfon Yellow G ; Trisulfon Yellow GF ; Zomine Yellow R . C.I. Direct Yellow 11 (CAS NO.1325-37-7) is reddish-brown powder. It is soluble in water, slightly soluble glycol ether, insoluble in other organic solvents. Azo dyes can be explosive when suspended in air at specific concentrations. C.I. Direct Yellow 11 is an azo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides. Flash point data for C.I. Direct Yellow 11 are not available; however, it is probably combustible.