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4-(2-Pyridylazo)resorcinol monosodium salt hydrate

MacsChem > Fine chemicals & Intermediates > 4-(2-Pyridylazo)resorcinol monosodium salt hydrate

What is 4-(2-Pyridylazo)resorcinol monosodium salt hydrate?

4-(2-Pyridylazo)resorcinol monosodium salt hydrate is an azo-based organic analytical reagent derived from resorcinol with a pyridylazo substitution. It is normally a red-brown crystalline powder and is readily soluble in water due to its monosodium salt form. The compound possesses strong metal-chelating properties and forms intensely colored complexes with a wide range of transition metal ions. It has a pH-dependent color change of the molecular structure which makes it highly sensitive in aqueous analytical systems. The hydrate crystalline form provides stability, while the monosodium salt enhances solubility and analytical performance for laboratory applications.

Structure of 4-(2-Pyridylazo)resorcinol monosodium salt hydrate

CAS No.: 16593-81-0

Synonyms: PAR monosodium salt hydrate

Properties of 4-(2-Pyridylazo)resorcinol monosodium salt hydrate

Physical Properties
Chemical formulaC11H8N3NaO2.xH2o
IUPAC Namesodium;5-hydroxy-2-(pyridin-2-yldiazenyl)phenolate;hydrate
Molecular weight255.20 g/mol
SolubilitySoluble in water
Ph9.8
StorageStore at room temperature
Chemical Properties
ColorOrange-brown to brownish
Physical State (20 °C)Solid
Melting Point>300 °C
λmax411 nm
OdorOdorless

Uses of 4-(2-Pyridylazo)resorcinol monosodium salt hydrate

  • 4-(2-Pyridylazo)resorcinol monosodium salt hydrate is widely used as a colorimetric reagent for the spectrophotometric determination of transition and heavy metal ions such as cobalt, iron, copper, nickel, zinc and manganese by forming stable colored complexes.
  • It is utilized for routine analysis and quality control of metal impurities in chemicals, industrial materials, and laboratory reagents.
  • It is used as an indicator in complexometric titrations due to its good metal chelation property and sharp colour change on complex formation.
  • The reagent is used for the detection and quantification of trace metal contaminants in environmental samples example water, wastewater, soil etc.
  • It is used as a derivatization reagent in HPLC for the selective determination of trace metals, especially chromium(III) and other transition elements.
  • It is widely used in analytical and coordination chemistry for studying metal ligand interactions and developing sensitive analytical procedures.
Pictograms :Warning pictogram
Hazard Statements :

H315: Causes skin irritation. 

H319: Causes serious eye irritation. 

H335: May cause respiratory irritation.

Precautionary statements :

P261: Avoid breathing dust/fume/gas/mist/vapors/spray. 

P264: Wash face, hands and any exposed skin thoroughly after handling. 

P271: Use only outdoors or in a well-ventilated area.

P280: Wear protective gloves/protective clothing/eye protection/face protection.

What is 4-(2-Pyridylazo)resorcinol monosodium salt hydrate?

4-(2-Pyridylazo)resorcinol monosodium salt hydrate is an azo-based organic analytical reagent derived from resorcinol with a pyridylazo substitution. It is normally a red-brown crystalline powder and is readily soluble in water due to its monosodium salt form. The compound possesses strong metal-chelating properties and forms intensely colored complexes with a wide range of transition metal ions. It has a pH-dependent color change of the molecular structure which makes it highly sensitive in aqueous analytical systems. The hydrate crystalline form provides stability, while the monosodium salt enhances solubility and analytical performance for laboratory applications.

Structure of 4-(2-Pyridylazo)resorcinol monosodium salt hydrate

CAS No.: 16593-81-0

Synonyms: PAR monosodium salt hydrate

Properties of 4-(2-Pyridylazo)resorcinol monosodium salt hydrate

Physical Properties
Chemical formulaC11H8N3NaO2.xH2o
IUPAC Namesodium;5-hydroxy-2-(pyridin-2-yldiazenyl)phenolate;hydrate
Molecular weight255.20 g/mol
SolubilitySoluble in water
Ph9.8
StorageStore at room temperature
Chemical Properties
ColorOrange-brown to brownish
Physical State (20 °C)Solid
Melting Point>300 °C
λmax411 nm
OdorOdorless

Uses of 4-(2-Pyridylazo)resorcinol monosodium salt hydrate

  • 4-(2-Pyridylazo)resorcinol monosodium salt hydrate is widely used as a colorimetric reagent for the spectrophotometric determination of transition and heavy metal ions such as cobalt, iron, copper, nickel, zinc and manganese by forming stable colored complexes.
  • It is utilized for routine analysis and quality control of metal impurities in chemicals, industrial materials, and laboratory reagents.
  • It is used as an indicator in complexometric titrations due to its good metal chelation property and sharp colour change on complex formation.
  • The reagent is used for the detection and quantification of trace metal contaminants in environmental samples example water, wastewater, soil etc.
  • It is used as a derivatization reagent in HPLC for the selective determination of trace metals, especially chromium(III) and other transition elements.
  • It is widely used in analytical and coordination chemistry for studying metal ligand interactions and developing sensitive analytical procedures.
Pictograms :Warning pictogram
Hazard Statements :

H315: Causes skin irritation. 

H319: Causes serious eye irritation. 

H335: May cause respiratory irritation.

Precautionary statements :

P261: Avoid breathing dust/fume/gas/mist/vapors/spray. 

P264: Wash face, hands and any exposed skin thoroughly after handling. 

P271: Use only outdoors or in a well-ventilated area.

P280: Wear protective gloves/protective clothing/eye protection/face protection.

FAQ's

4-(2-Pyridylazo)resorcinol monosodium salt hydrate is mainly used as a colorimetric reagent for the spectrophotometric determination of metal ions. It is also used in complexometric titrations, environmental analysis, HPLC methods and analytical research.

4-(2-Pyridylazo)resorcinol monosodium salt hydrate is readily soluble in water and thus suitable for aqueous analytical and laboratory use.

4-(2-Pyridylazo)resorcinol monosodium salt hydrate forms stable, highly colored complexes with a wide variety of transition metal ions and thus provides a sensitive and accurate spectrophotometric determination.

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