1,1'-Azobis-1,2,3-triazole is a moderately explosive but comparatively stable chemical compound[citation needed] which contains a long continuous chain of nitrogen atoms, with an unbroken chain of eight nitrogen atoms cyclised into two 1,2,3-triazole rings. It is stable up to 194 °C. The compound exhibits cis–trans isomerism at the central azo group: the trans isomer is more stable and is yellow, while the cis isomer is less stable and is blue. The two rings are aromatic and form a conjugated system with the azo linkage. This chromophore allows the trans compound to be isomerised to the cis when treated with an appropriate wavelength of ultraviolet light.[1]
| |
 | |
| Names | |
|---|---|
| Preferred IUPAC name
1,1′-Diazenediyldi(1H-1,2,3-triazole) | |
| Identifiers | |
3D model (JSmol)
|
|
| ChemSpider | |
PubChem CID
|
|
| UNII | |
| |
| |
| Properties | |
| C4H4N8 | |
| Molar mass | 164.132 g·mol−1 |
| Appearance | Blue (cis isomer) Yellow (trans isomer) |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards
|
Explosive |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Related compounds
editIn 2011, 1,1'-azobis(1,2,3,4-tetrazole) with formula C2H2N10 was prepared by Klapötke and Piercey which has a 10-nitrogen chain.[2] The record was later taken by a 11-nitrogen chain compound synthesized by a group of Chinese researchers.[3][which?] A branched chain of 11-nitrogen system has also been reported as part of an unstable but highly nitrogen rich azidotetrazole derivative with formula C2N14.[4]
.png)
See also
editReferences
edit- ^ Li, Y. C.; Qi, C.; Li, S. H.; Zhang, H. J.; Sun, C. H.; Yu, Y. Z.; Pang, S. P. (2010). "1,1′-Azobis-1,2,3-triazole: A High-Nitrogen Compound with Stable N8 Structure and Photochromism". Journal of the American Chemical Society. 132 (35): 12172–3. doi:10.1021/ja103525v. PMID 20715773.
- ^ Klapötke, Thomas M.; Piercey, Davin G. (2011). "1,1′-Azobis(tetrazole): A Highly Energetic Nitrogen-Rich Compound with a N10 Chain". Inorg. Chem. 50 (7): 2732–2734. doi:10.1021/ic200071q. PMID 21384800.
- ^ Tang, Y.; Yang, H.; Wu, B.; Ju, X.; Lu, C.; Cheng, G. (2013). "Synthesis and Characterization of a Stable, Catenated N11Energetic Salt". Angewandte Chemie International Edition. 52 (18): 4875–7. doi:10.1002/anie.201300117. PMID 23554233.
- ^ Klapötke, T. M.; Krumm, B.; Martin, F. A.; Stierstorfer, J. R. (2012). "New Azidotetrazoles: Structurally Interesting and Extremely Sensitive". Chemistry: An Asian Journal. 7 (1): 214–224. doi:10.1002/asia.201100632. PMID 22069147. S2CID 27239569.