Ruthenium(II) and osmium(II) polypyridyl complexes of an asymmetric pyrazinyl- and pyridinyl-containing 1,2,4-triazole based ligand. Connectivity and physical properties of mononuclear complexes was written by Browne, Wesley R.;O’Connor, Christine M.;Hughes, Helen P.;Hage, Ronald;Walter, Olaf;Doering, Manfred;Gallagher, John F.;Vos, Johannes G.. And the article was included in Journal of the Chemical Society, Dalton Transactions in 2002.Recommanded Product: Ethyl pyrazine-2-carboxylate This article mentions the following:
The synthesis, purification and characterization of two coordination isomers of Ru(II) and Os(II) complexes containing the ligand 3-(pyrazin-2′-yl)-5-(pyridin-2”-yl)-1,2,4-triazole (Hppt) are described. The x-ray and mol. structure of [Ru(bipy)2(ppt)]PF6·MeOH (1a) is reported, where the Ru(bipy)2-center is bound to the ppt– ligand via the pyridine N and the N1 atom of the triazole ring. 1H NMR spectroscopic measurements confirm that in the second isomer (1b) the Ru(bipy)2-moiety is bound via the N2 atom of the triazole ring and the pyrazine ring. Partially deuterated metal complexes (d8-bipy derivatives) were used to facilitate interpretation of 1H NMR spectra. The redox and electronic properties indicate that there are significant differences in the electronic properties of the two coordination isomers obtained. The acid-base properties of the compounds are also reported and show that the pKa of the 1,2,4-triazole ring varies systematically depending on the nature of the noncoordinating substituent. Anal. of these data indicates a significant electronic interaction between the pyridyl/pyrazyl rings and the 1,2,4-triazole ring in the coordinated ppt– ligand. In the experiment, the researchers used many compounds, for example, Ethyl pyrazine-2-carboxylate (cas: 6924-68-1Recommanded Product: Ethyl pyrazine-2-carboxylate).
Ethyl pyrazine-2-carboxylate (cas: 6924-68-1) belongs to pyrazine derivatives. Pyrazine is a symmetrical molecule with point group D2h. Pyrazine is less basic than pyridine, pyridazine and pyrimidine. A number of pyrazine-based derivatives were used as dyes or fluorescent probes.Recommanded Product: Ethyl pyrazine-2-carboxylate