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Calconcarboxylic acid

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Calconcarboxylic acid Basic information

Product Name:
Calconcarboxylic acid
Synonyms:
  • 2-Hydroxy[(2-hydroxy-4-sulpho-1-naphthalene)azo]naphthalene-3-carboxylicacid
  • 2-naphthalenecarboxylicacid,3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)az
  • 3-HYDROXY-4-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-2-NAPHTHALENECARBOXYLIC ACID
  • 3-HYDROXY-4-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)NAPHTHALENE-2-CARBOXYLIC ACID
  • 2-HYDROXY-1-(2'-HYDROXY-4'-SULFO-1'-NAPHTHYLAZO)-3-NAPHTHOIC ACID
  • 2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID
  • 2-HYDROXY-1-(2-HYDROXY-4-SULFO-1-NAPHTHYLAZO)-NAPHTHALENE-3-CARBOXYLIC ACID
  • 2-HYDROXY-1-(2-HYDROXY-4-SULPHO-1-NAPHTHYLAZO)-3-NAPHTHOIC ACID
CAS:
3737-95-9
MF:
C21H14N2O7S
MW:
438.41
EINECS:
223-117-0
Product Categories:
  • Analytical Chemistry
  • Azo Compounds
  • Chelating Reagents
  • Naphthylazo Compounds
Mol File:
3737-95-9.mol
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Calconcarboxylic acid Chemical Properties

Melting point:
300 °C(lit.)
Density 
1.60±0.1 g/cm3(Predicted)
form 
Powder
pka
-0.50±0.40(Predicted)
color 
Very dark purple to black
Odor
Odorless
Water Solubility 
slightly soluble
BRN 
727492
Stability:
Stable. Incompatible with strong oxidizing agents.
CAS DataBase Reference
3737-95-9(CAS DataBase Reference)
EPA Substance Registry System
2-Naphthalenecarboxylic acid, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]- (3737-95-9)
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Safety Information

Hazard Codes 
Xi
Risk Statements 
36/37/38
Safety Statements 
26-36-37/39
WGK Germany 
3
TSCA 
Yes
HS Code 
29270000

MSDS

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Calconcarboxylic acid Usage And Synthesis

Chemical Properties

dark violet powder

Purification Methods

Purify it via its p-toluidinium salt, viz: dissolve the dye in warm 20% aqueous MeOH, treat with an equivalent of p-toluidine and cool to precipitate the salt. Finally recrystallise the acid from hot water. [Itoh & Ueno Analyst (London) 95 583 1970.] It is an indicator and complexes with Ca2+ in presence of Mg2+ and other metal ions [Patton & Reeder Anal Chem 28 1026 1956, Prentoe & Prentoe Analyst 106 227 1981].

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