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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Appearance / physical state / colour

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
appearance / physical state / colour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Peer reviewed article
Justification for type of information:
Data from published paper
Qualifier:
according to guideline
Guideline:
other: As mention below
Principles of method if other than guideline:
Determine appearance of 4-[(E)-2-(2,4-dimethylphenyl)diazen-1-yl]-3-methyl-1-phenyl-4,5-dihydro-1H-pyrazol-5-one
GLP compliance:
no
Specific details on test material used for the study:
- Name of test material (IUPAC name): 4-[(E)-2-(2,4-dimethylphenyl)diazen-1-yl]-3-methyl-1-phenyl-4,5-dihydro-1H-pyrazol-5-one
- Common name: Solvent Yellow 18
- Molecular formula: C18H18N4O
- Molecular weight: 306.367 g/mol
- Smiles notation: O=C1N(N=C(C)[C@@H]1\N=N\c1c(cc(cc1)C)C)c1ccccc1
- InChl: 1S/C18H18N4O/c1-12-9-10-16(13(2)11-12)19-20-17-14(3)21-22(18(17)23)15-7-5-4-6-8-15/h4-11,17H,1-3H3/b20-19+
- Substance type: Organic
- Physical state: Solid
Physical state at 20°C and 1013 hPa:
solid
Key result
Form:
solid: crystalline
Colour:
Yellow
Odour:
other: No other detail available
Substance type:
organic
Conclusions:
On the basis of physical observation and using the sense of smell, 4 -[(E)-2 -(2,4 -dimethylphenyl)diazen-1 -yl]-3 -methyl-1 -phenyl-4,5 -dihydro-1H-pyrazol-5 -one was observed to be a solid yellow crystal.
Executive summary:

On the basis of physical observation and using the sense of smell, 4 -[(E)-2 -(2,4 -dimethylphenyl)diazen-1 -yl]-3 -methyl-1 -phenyl-4,5 -dihydro-1H-pyrazol-5 -one was observed to be a solid yellow crystal.

Description of key information

On the basis of physical observation and using the sense of smell, 4 -[(E)-2 -(2,4 -dimethylphenyl)diazen-1 -yl]-3 -methyl-1 -phenyl-4,5 -dihydro-1H-pyrazol-5 -one was observed to be a solid yellow crystal.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:
solid

Additional information

On the basis of physical observation and using the sense of smell, 4 -[(E)-2 -(2,4 -dimethylphenyl)diazen-1 -yl]-3 -methyl-1 -phenyl-4,5 -dihydro-1H-pyrazol-5 -one was observed to be a solid yellow crystal.