Disperse Orange 1

Disperse Orange 1
Names
	Other names 4-Anilino-4'-nitroazobenzene; C.I. 11080 (Colour index numbers)
Identifiers
CAS Number	2581-69-3 [chemspider];
3D model (JSmol)	Interactive image;
ChemSpider	16477;
ECHA InfoCard	100.018.141
EC Number	219-954-6;
PubChem CID	17414;
UNII	1592R4P97H;
CompTox Dashboard (EPA)	DTXSID7062536 ;
	InChI InChI=1S/C18H14N4O2/c23-22(24)18-12-10-17(11-13-18)21-20-16-8-6-15(7-9-16)19-14-4-2-1-3-5-14/h1-13,19H Key: YFVXLROHJBSEDW-UHFFFAOYSA-N;
	SMILES C1=CC=C(C=C1)NC2=CC=C(C=C2)N=NC3=CC=C(C=C3)[N+](=O)[O-];
Properties
Chemical formula	C18H14N4O2
Molar mass	318.33476 g/mol
Melting point	160.0 °C (320.0 °F; 433.1 K)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H317
Precautionary statements	P261, P272, P280, P302+P352, P321, P333+P313, P363, P501
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Disperse Orange 1, or 4-anilino-4'-nitroazobenzene, is an azo dye. Commercial samples contain approximately 25% dye by weight, with the remaining mass consisting of NaCl and other salts.

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.^[1]^[2]

References

^ Hair, S. R.; Taylor, G. A.; Schultz, L. W. J. (1990). "An Easily Implemented Flash Photolysis Experiment for the Physical Chemistry Laboratory: the Isomerization of 4-Anilino-4'-Nitroazobenzene". Journal of Chemical Education. 67 (8): 709. Bibcode:1990JChEd..67..709H. doi:10.1021/ed067p709.
^ Wildes, P. D.; Pacifici, J. G.; Irick, G.; Whitten, D. G. J. Am. Chem. Soc., 1971, 93, 2004.

[1] Hair, S. R.; Taylor, G. A.; Schultz, L. W. J. (1990). "An Easily Implemented Flash Photolysis Experiment for the Physical Chemistry Laboratory: the Isomerization of 4-Anilino-4'-Nitroazobenzene". Journal of Chemical Education. 67 (8): 709. Bibcode:1990JChEd..67..709H. doi:10.1021/ed067p709.

[2] Wildes, P. D.; Pacifici, J. G.; Irick, G.; Whitten, D. G. J. Am. Chem. Soc., 1971, 93, 2004.

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