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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
23-07-2018 – 23-07-2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
Experimental test result performed using standard test guidelines
Reference:
Composition 0
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Principles of method if other than guideline:
The melting point determination of Test item tetrasodium 7-amino-4-hydroxy-3-[(E)-2-{2- methoxy-5-methyl-4-[2-(sulfonatooxy)ethanesulfonyl] phenyl}diazen-1-yl]-8-[(E)-2-{2- sulfonato-4-[2-(sulfonatooxy)ethanesulfonyl]phenyl}diazen-1-yl]naphthalene-2-sulfonate (CAS No. 503155-49-5 ) was done as per the test guideline OECD 102. The method followed was according to Capillary/metal block.
GLP compliance:
not specified
Type of method:
other: standard laboratory method
Test material information:
Composition 1
Specific details on test material used for the study:
- Name of test material : 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[[2-methoxy-5-methyl-4-[[2-(sulfooxy)ethyl]sulfonyl] phenyl]azo]-8-[[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]azo]-, tetrasodium salt
- Molecular formula : C28H25N5Na4O20S6
- Molecular weight : 1035.87 g/mol
- Smiles notation : Cc1cc(N=Nc2c(S(=O)(=O)O{-}.[Na]{+})cc3c(ccc(N)c3N=Nc3ccc(S(=O)(=O)CCOS(=O)(=O)O{-}.[Na]{+})cc3S(=O)(=O)O{-}.[Na]{+})c2O)c(OC)cc1S(=O)(=O)CCOS(=O)(=O)O{-}.[Na]{+}
- Substance type : Organic
- Physical state : Solid
Key result
Atm. press.:
964.3 hPa
Decomposition:
yes
Decomp. temp.:
161.3 °C
Sublimation:
no
Remarks on result:
other: other details not available

TEST DESCRIPTION AND RESULT

    Method Details  Observations

 Remarks if,

any

 Guideline

 OECD 102

                        
 Method  Capillary/metal block  
 
Principle of method

 The temperature at which a

solid becomes a liquid at

standard atmospheric

pressure

 

 Grinding of Test

item done

 

 No

 Atmospheric

pressure

 hPa

 964.3hPa

Decomposition

 Decomposition temperature

(°C), if applicable

 YES

 Sublimation

 Sublimation temperature

(°C), if applicable

 No

 mean

decomposition

temp

 °C

 161.3°C

Conclusions:
The melting point determination of tetrasodium 7 -amino-4 -hydroxy-3 -[(E)-2 -{2 -methoxy-5 - methyl-4 -[2 -(sulfonatooxy)ethanesulfonyl]phenyl}diazen-1 -yl]-8 -[(E)-2 -{2 -sulfonato-4 -[2 - (sulfonatooxy)ethanesulfonyl]phenyl}diazen-1 -yl]naphthalene-2 -sulfonate (CAS No. 503155 -49 -5) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and man decomposition temp was determine to be 161.3°C at 964.3 hPa.
Executive summary:

The melting point determination of tetrasodium 7 -amino-4 -hydroxy-3 -[(E)-2 -{2 -methoxy-5 - methyl-4 -[2 -(sulfonatooxy)ethanesulfonyl]phenyl}diazen-1 -yl]-8 -[(E)-2 -{2 -sulfonato-4 -[2 - (sulfonatooxy)ethanesulfonyl]phenyl}diazen-1 -yl]naphthalene-2 -sulfonate (CAS No. 503155 -49 -5) was done following OECD Guideline 102 and according to the metal block capillary

method. The test was conducted in replicates and man decomposition temp was determine to be 161.3°C at 964.3 hPa.

Description of key information

The melting point determination of tetrasodium 7 -amino-4 -hydroxy-3 -[(E)-2 -{2 -methoxy-5 - methyl-4 -[2 -(sulfonatooxy)ethanesulfonyl]phenyl}diazen-1 -yl]-8 -[(E)-2 -{2 -sulfonato-4 -[2 - (sulfonatooxy)ethanesulfonyl]phenyl}diazen-1 -yl]naphthalene-2 -sulfonate (CAS No. 503155 -49 -5) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and man decomposition temp was determine to be 161.3°C at 964.3 hPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
161.3 °C

Additional information

The melting point determination of tetrasodium 7 -amino-4 -hydroxy-3 -[(E)-2 -{2 -methoxy-5 - methyl-4 -[2 -(sulfonatooxy)ethanesulfonyl]phenyl}diazen-1 -yl]-8 -[(E)-2 -{2 -sulfonato-4 -[2 - (sulfonatooxy)ethanesulfonyl]phenyl}diazen-1 -yl]naphthalene-2 -sulfonate (CAS No. 503155 -49 -5) was done following OECD Guideline 102 and according to the metal block capillary method. The test was conducted in replicates and man decomposition temp was determine to be 161.3°C at 964.3 hPa.