Synthesis and characterization of new rhodamine dyes with large Stokes shift was written by Tian, Zhidan;Tian, Baozhu;Zhang, Jinlong. And the article was included in Dyes and Pigments in 2013.Safety of 6-Methoxyquinoxaline This article mentions the following:
Two new rhodamine dyes (Rh Q-H, Rh Q-Me) containing 1, 4-diethyl-1, 2, 3, 4-tetrahydroquinoxaline as an effective electron donor are designed and synthesized. The structures of the novel compounds are confirmed by 1H NMR, 13C NMR and ESI. Due to an excited-state intramol. charge transfer (ICT), the new dyes exhibit longer absorption (>580 nm) and emission (>640 nm) compared with the model compounds, rhodamine 101 and rhodamine 6G. The new rhodamine dyes show large Stokes shift of 40-50 nm in commonly used solvents. Notably, when measured in a mixture of H2O/EtOH solution, significant stokes shift of 65-68 nm are achieved, which is among the largest Stokes shifts ever reported for rhodamine dyes. In the experiment, the researchers used many compounds, for example, 6-Methoxyquinoxaline (cas: 6639-82-3Safety of 6-Methoxyquinoxaline).
6-Methoxyquinoxaline (cas: 6639-82-3) belongs to quinoxaline derivatives. Compounds possessing quinoxaline derivatives were bestowed with a variety of significant biological properties such as antiviral, antimalarial, anticancer, DNA intercalation, DNA duplex stabilization, and many others. Quinoxalines are used as dyes, pharmaceuticals, and antibiotics such as echinomycin, levomycin exhibiting antitumoral properties. Quinoxalines establish also the basis of anthelmintics and receptor antagonists.Safety of 6-Methoxyquinoxaline
Referemce:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider