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P-Dimethylaminoazobenzene

Organic compound

synonym Methyl yellow (Methyl yellow) generally refers to p-dimethylaminoazobenzene

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

P-Dimethylaminoazobenzene is an organic compound with chemical formula C fourteen H fifteen N three , mainly used as acid-base indicator for non-aqueous solution titration.

On October 27, 2017, the list of carcinogens released by the International Agency for Research on Cancer of the World Health Organization (WHO) was preliminarily sorted out for reference, and p-dimethylaminoazobenzene was included in the list of Category 2B carcinogens.^[1]

Chinese name: P-Dimethylaminoazobenzene
Foreign name: Methyl yellow；para-Dimethylaminoazobenzene
Alias: Solvent Yellow 2 、 N , N -Dimethyl-4 - (phenylazo) aniline 、 Dimethyl yellow 、 4 - (dimethylamino) azobenzene
chemical formula: C fourteen H fifteen N three
molecular weight: two hundred and twenty-five point two eight nine
CAS login number: 60-11-7
EINECS login number: 200-455-7

Melting point: 111 ℃
Boiling point: 371.1 ℃
Water solubility: Insoluble
Density: 1.027 g/cm³
Appearance: Orange powder
Flash point: 178.2 ℃
Security description: S36/37；S45
Hazard symbol: T
Hazard description: R25；R40；R68

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▪ Risk terminology

Physical and chemical properties

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Density: 1.027g/cm three

Melting point: 111 ℃

Boiling point: 371.1 ℃

Flash point: 178.1 ℃

Refractive index: 1.567

Appearance: orange powder

Solubility: soluble in ethanol, benzene, chloroform, ether, petroleum ether, strong acid and oil, insoluble in water^[2]

Molecular structure data

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Molar refractive index: 71.66

Molar volume (cm three /mol）：219.4

Isotonic specific volume (90.2K): 543.9

Surface tension (dyne/cm): 37.7

Polarization (10 -24 cm three ）：28.40^[2]

Calculate chemical data

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Calculation reference value of drainage parameter (XlogP): 4.6

Number of hydrogen bond donors: 0

Number of hydrogen bond receptors: 3

Number of rotatable chemical bonds: 3

Number of tautomers: 0

Topological molecule polar surface area (TPSA): 28

Number of heavy atoms: 17

Surface charge: 0

Complexity: 236

Number of isotope atoms: 0

Determine the number of atomic structure centers: 0

Number of uncertain atomic structure centers: 0

Determine the number of chemical bond structure centers: 0

Number of uncertain chemical bond structure centers: 0

Number of covalent bond units: 1^[2]

purpose

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It is mainly used as an acid-base indicator for non-aqueous solution titration.

security information

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Safety terminology

S36/37：Wear suitable protective clothing and gloves.

Wear appropriate protective clothing and gloves.

S45：In case of accident or if you feel unwell, seek medical advice immediately (show the lable where possible).

In case of an accident or feeling unwell, seek medical advice immediately (show the label if possible).

Risk terminology

R25：Toxic if swallowed.

Toxic if swallowed.

R40：Possible risks of irreversible effects.

There may be risk of irreversible effects.

R68：Possible risk of irreversible effects.

There may be danger of irreversible consequences.

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