Coordination ambivalence and fluxional behavior in mono- and binuclear pentacarbonyltungsten complexes of pteridine and its deaza derivatives was written by Bessenbacher, Christian;Kaim, Wolfgang. And the article was included in Journal of Organometallic Chemistry in 1989.HPLC of Formula: 322-46-3 This article mentions the following:
WL(CO)5 (L = pteridine (pte), 1,5-naphthyridine, (npt), 1,4,5-triazanaphthalene (tan), 1,4,6-triazanaphthalene) and W2(CO)10L1 (L1 = pt, npt) were prepared Unambiguous identification of coordination sites was only possible by use of high-resolution 1H NMR because the chem. shifts and spin-spin coupling constants are characteristically affected by W(CO)5-coordination to neighboring N centers. Fluxional behavior with respect to the peri coordination sites was observed for W(CO)5(1,4,5-tan) and W(CO)10(pte). Competition between the more basic pyridine or pyrimidine and the better π backdonating pyrazine N centers leads to various positions for the nondegenerate equilibrium between linkage isomers. Cyclic voltammetry and solvent-dependent charge transfer absorption spectra of the complexes reveal low-lying π* levels which can become populated after chem. or electrochem. reduction, the spin distribution in the centrosym. binuclear complex of 1,5-naphthyridine anion radical was fully characterized using ESR and results from MO calculations In the experiment, the researchers used many compounds, for example, Pyrido[2,3-b]pyrazine (cas: 322-46-3HPLC of Formula: 322-46-3).
Pyrido[2,3-b]pyrazine (cas: 322-46-3) belongs to pyrazine derivatives. Pyrazines are volatile compounds that are used in the cosmetic, food, flavor, and fragrance industries. A large number of pyrazine derivatives are known for their antitumor, antibiotic, anticonvulsant, antituberculosis, and diuretic activities.HPLC of Formula: 322-46-3