1-(2-pyridinylazo)-2-naphthol 1-(2-pyridinylazo)-2-Naohthalenol

Structural formula

• Numbering system
• Physical property data
• Toxicological data
• Ecological data
• Molecular structure data
• Computing chemical data
• More
  • Properties and Stability
  • Storage method
  • Synthesis method
  • Purpose

Numbering system

CAS number:85-85-8

MDL number:MFCD00004071

EINECS number:201-637-9

RTECS number:None

BRN number:206390

PubChem number:24888068

Physical property data

1. Properties: Orange-red amorphous powder

2. Density (g/mL, 25/4℃): Undetermined

3. Relative vapor density (g/ mL, air=1): Undetermined

4. Melting point (ºC): 141℃

5. Boiling point (ºC, normal pressure): Undetermined

6. Boiling point (ºC, 5.2kPa): Undetermined

7. Refractive index: Undetermined

8. Flash point (ºC): Undetermined

9. Specific rotation (º): Undetermined

10. Autoignition point or ignition temperature (ºC): Undetermined

11. Vapor pressure (kPa, 25ºC): Undetermined

12. Saturated vapor pressure (kPa, 60ºC): Undetermined

13. Heat of combustion (KJ/mol): Undetermined

14. Critical temperature (ºC): Undetermined

15. Critical pressure (KPa): Undetermined

16. Log value of oil-water (octanol/water) partition coefficient: Undetermined

17. Explosion upper limit (%, V/V): Undetermined

18. Explosion lower limit (%, V/V): Undetermined

19. Solubility: Soluble in methanol, ethanol, benzene, ether, chloroform and hot dilute alkali solution, insoluble in water.

Toxicological data

None

Ecological data

None

Molecular structure data

1. Molar refractive index: 74.04

2. Molar volume (cm³/mol): 199.9

3. Isotonic specific volume (90.2K): 534.0

4. Surface tension (dyne/cm): 50.8

5. Polarizability (10^-24cm³): 29.35

Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): 2.9

2. Number of hydrogen bond donors: 1

3. Number of hydrogen bond acceptors: 4

4. Number of rotatable chemical bonds: 2

5. Number of tautomers: 2

6. Topological molecular polar surface area (TPSA): 54.4

7. Number of heavy atoms: 19

8. Surface charge: 0

9.Complexity: 402

10. Number of isotope atoms: 0

11. Number of determined atomic stereocenters: 0

12. Uncertain atomic stereocenters Quantity: 0

13. Determined number of stereocenters of chemical bonds: 1

14. Uncertain number of stereocenters of chemical bonds: 0

15. Covalent bonds Number of units: 1

Properties and stability

In a solution with a certain pH value, it forms red or other colored complexes with most metal ions. The complexes are insoluble in water.

Storage method

Seal and save.

Synthesis method

1. Obtained from diazotization of 2-aminopyridine and coupling with 2-naphthol. React absolute ethanol with metallic sodium to generate sodium ethoxide, then add the ethanol solution of 2-aminopyridine, introduce ethyl nitrite vapor and react at 45-50°C. After the reaction is completed, incubate for 8 hours, filter out the diazonium salt and wash with diethyl ether. Add the diazonium salt to the ethanol solution of 2-naphthol, introduce carbon dioxide at 45-50°C for coupling reaction, filter out the crystals after 6 hours, wash with distilled water, recrystallize with ethanol, and dry to obtain the finished product.

2.Add sodium ethoxide obtained by the reaction of absolute ethanol and metallic sodium in the ethanol solution of α-aminopyridine according to the theoretical amount, and then Then introduce ethyl nitrite steam, and control the reaction temperature at 45-50°C. After the steam is introduced, keep it warm for 8 hours. The filtered diazonium salt crystals are washed with diethyl ether. The washed diazonium salt is added to the same amount of In the ethanol solution of 2-naphthol, control the temperature at 45-50°C, then add carbon dioxide for coupling, filter out the crystals after 6 hours, wash with distilled water, recrystallize with 7 times the amount of ethanol, and dry below 80°C , to obtain refined 1-(2-pyridylazo)-2-naphthol.
The process reaction formula is:

Purpose

1. This product is a complex indicator agent. The solution is pink when the pH is above 12, orange-red in weak acid, and purple in concentrated sulfuric acid. Its metal complex is pink or red.

2.Used as a trace metal precipitant to capture titanium, vanadium, manganese, iron, cobalt, nickel, copper, zinc and Tiny trace metals such as lead.