Synthesis and photophysical properties of N-styrylazinones was written by Cho, Su-Dong;Hwang, Jaeyoung;Kim, Ho-Kyun;Yim, Heung-Sup;Kim, Jeum-Jong;Lee, Sang-Gyeong;Yoon, Yong-Jin. And the article was included in Journal of Heterocyclic Chemistry in 2007.Reference of 51356-03-7 This article mentions the following:
N-Styrylazinones and 1-styrylbenzotriazole were synthesized, and their photophys. properties were investigated. (Z)- and/or (E)-N-Styrylazines RCH:CHPh (R = 2-oxo-1-pyridyl, 1,2,3-benzotriazol-1-yl, 1-phthalimido, 4,5-dichloro-3-oxo-2-pyridazinyl, etc.) were prepared from the corresponding N-unsubstituted heterocycles and benzaldehyde by four methods. The absorption maxima of both (E)- and (Z)-isomers were measured in four solvents. Their absorption maxima showed a moderate dependence upon solvents. The absorption maxima of (Z)-isomers were blue-shifted as compared the corresponding (E)-isomers. Emission maxima, fluorescence band half-widths, 0,0 transition energies, Stokes shifts, and quantum yields for some of N-styrylazinones were measured in organic solvents. The fluorescence spectra show moderate solvatochromism. The fluorescence properties of N-styrylheterocycles depend on heterocyclic moiety. In the experiment, the researchers used many compounds, for example, 4,5-Dichloro-2-(chloromethyl)pyridazin-3(2H)-one (cas: 51356-03-7Reference of 51356-03-7).
4,5-Dichloro-2-(chloromethyl)pyridazin-3(2H)-one (cas: 51356-03-7) belongs to pyridazine derivatives. Pyridazines are rare in nature, possibly reflecting the scarcity of naturally occurring hydrazines, common building blocks for the synthesis of these heterocycles. The activity depends upon the changes of substituted groups in the pyridazine ring system resulting in different biological activities. In addition, the natural pyrimidine bases uracil, thymine, and cytosine, which are constituents of the nucleic acids, are found to be the most important naturally occurring diazines.Reference of 51356-03-7
Referemce:
Pyridazine – Wikipedia,
Pyridazine | C4H4N2 – PubChem