Disperse Orange 1

Disperse Orange 1
Disperse Orange 1
CAS number 2581-69-3
EC number 219-954-6
Molecular formula C18H14N4O2
Molar mass 318.33476 g/mol
Melting point

160.0 °C, 433 K, 320 °F

 YesY Orange 1 (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Disperse Orange 1 (4-anilino-4'-nitroazobenzene) is a dye of the azobenzene class. Disperse Orange 1 contains approximately 25% dye by weight, with the remaining mass consisting of NaCl and other salts[1]. This dye is useful in conducting experiments with flash photolysis due to the isomerization effect between the trans-4A4N and cis-4A4N states that occurs during photo relaxation.[citation needed]


  1. ^ Hair, S. R.; Taylor, G. A. and Schultz, L. W. J. Chem. Educ. 1990, 67, 709. Journal of Chemical Education

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