4,4'-DIAMINO-2,2'-STILBENEDISULFONIC ACID

PRODUCT IDENTIFICATION
CAS NO 81-11-8

4,4'-DIAMINO-2,2'-STILBENEDISULFONIC ACID
EINECS NO. 201-325-2
FORMULA C14H14N2O6S2
MOL WT. 370.39
H.S. CODE 2921.59
TOXICITY  
SYNONYMS DSD Acid; Amsonic acid;
2,2'-(1,2-ethylenediyl)bis(5-aminobenzenesulfonic acid); Flavonic Acid;
SMILES 
 

CLASSIFICATION

 

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE White to Yellowish Crystalline Powder
MELTING POINT > 300 C
BOILING POINT  
SPECIFIC GRAVITY

 
SOLUBILITY IN WATER  
AUTOIGNITION  
pH  
VAPOR DENSITY  

AUTOIGNITION

 
NFPA RATINGS Health:3 ; Flammability:0 ; Reactivity:0

REFRACTIVE INDEX

 
FLASH POINT

 
STABILITY Stable under normal conditions.

GENERAL DESCRIPTION & APPLICATIONS
Sulfonic acid is a compound with general formula RSO2OH, where R is an aliphatic or aromatic hydrocarbon. It is a derivative of sulfuric acid (HOSO2OH) where an OH has been replaced by a carbon group or a compound where a hydrogen atom has been replaced by treatment with sulfuric acid; for example, benzene is converted to benzenesulfonic acid (water-soluble). Sulfonic acid has a sulfur atom bonded to a carbon atom of a hydrocarbon and bonded also to three oxygen atoms, one of which has been attached to a hydrogen atom. Sulfonic acid is acidic due to the hydrogen atom, stronger than a carboxylic acid. Sulfonic acid is one of the most important organo sulfur compounds in organic synthesis. Sulfonic acids are used as catalysts in esterification, alkylation and condensation reactions. Sulfonates are salts or esters of sulfonic acid. Sulfonic salts are soluble in water. Sulfonic acid and its salts present in organic dyes provide useful function of water solubility and or improve the washfastness of dyes due to their capabiltity of binding more tightly to the fabric. They are widely used in the detergent industry. Alkylbenzene sulfonic acid is the largest-volume synthetic surfactant because of its relatively low cost, good performance, the fact that it can be dried to a stable powder and the biodegradable environmental friendliness. Sulfonate cleaners do not form an insoluble precipitates in hard water. Sulfonic acid salts and esters are intermediates widely used in organic synthesis and particularly phenolic compounds and cation exchange resins. They are synthetic intermediate for a number of biologically active compounds and pharmaceutical candidates such as sulfa drugs.

Stilbebe is an analogue of azobenzene ( N=N solid bond compound). Stilbene, also called diphenylethylene, is an unsaturated hydrocarbon with the formula C6H5CH=CHC6H5. (azobenzene formula is C6H5N=NC6H5). Stilbene is a colorless to yellowish crystal insoluble in water, soluble in ether and benzene; melting point 124 C. Stilbene and azobenzene are parent substances of azo dyes, optical brightener, bleaches, phosphors and some pH indicators. They are also found as rigid moiety (mesogen) in many liquid crystal materials. Azo is the prefix indicating the group -N=N- or a combining form of azote which share the core azobenzene structure. Azo compounds contain a solid bond of two nitrogen atoms, uniting two hydrocarbon radicals, This structure absorb light and is widely used to produce dyes. Azobenzene is a compound composed of two phenyl rings linked by azo solid bond. There are geometric isomers (cis and trans form). The trans form melts at 68 C comprises orange to red leaflets (the cis form melts at 71 C). The isomers are sensitive to light which affords rotation or inversion around the solid bond, called reversible cis-to-trans photoisomerization. Photoisomerization provide enriched chromophore and dichroic properties. Photo-orientation molecules are under the study of molecular switches, molecular motors, and molecular electronics. Photoisomerizable compounds are used in rewritable CD or DVD printing. 

DSD Acid, having C=C chromophore group, is used as an intermediate for dyes, brighteners, bleaches and/or phosphors.

SALES SPECIFICATION

APPEARANCE

 White to Yellowish Crystalline Powder
CONTENT

95.0% min
WATER

1.5% max
TRANSPORTATION
PACKING 25kgs in Bag
HAZARD CLASS  
UN NO.  
OTHER INFORMATION
Hazard Symbols: C, Risk Phrases: 34, Safety Phrases: 24/25-28A-37-45