Synthesis, characterization and molecular structures of some tetraosmium carbonyl clusters containing pyridine or phenanthroline type ligands was written by Choi, Ya-Yin;Wong, Wing-Tak. And the article was included in Journal of Organometallic Chemistry in 1999.COA of Formula: C7H5N3 This article mentions the following:
The reactions of activated tetraosmium carbonyl cluster [Os4(μ-H)4(CO)11(NCMe)] (1) with monopyridyl ligands give new clusters [Os4(μ-H)4(CO)11,(pyp)] (3) and [Os4(μ-H)4 (CO)11(pya)] (4) (pyp = pyrido[2,3-b]pyrazine, pya = 4-pyridinecarboxaldehyde). Similarly, the reactions of [Os4(μ-H)4(CO)10(NCMe)2] (2) with bipyridyl or phenanthroline type ligands afford [Os4(μ-H)4(CO)10(bpy)] (5), [Os4(μ-H)4 (CO)10(4,4′-diphenyl-2,3-bipyridine)] (6), [Os4(μ-H)4(CO)10(phen)] (7), [Os4(μ-H)4(CO)10(2,9-dimethyl-4,4′-diphenyl-1,10-phenanthroline)] (8), and [Os4(μ-H)4(CO)10(dipyrido[3,2-a:2′,3′-c]phenazine)] (9), which exhibit interesting ring conformations. Treatment of 2 with the N-P mixed donor ligand diphenyl-2-pyridylphosphine (dppy) gives a novel bridging cluster [Os4(μ-H)4(CO)10(dppy)] (10). In the experiment, the researchers used many compounds, for example, Pyrido[2,3-b]pyrazine (cas: 322-46-3COA of Formula: C7H5N3).
Pyrido[2,3-b]pyrazine (cas: 322-46-3) belongs to pyrazine derivatives. Pyrazinesare six-membered aromatic heterocyclic organic compounds with two nitrogen atoms at 1,4-positions. Pyrazine is a weaker base (pKb = 13.4) than pyridine (pKb = 8.8), pyrimidine (pKb = 12.7). Pyrazines are chemical compounds (technically called “methoxypyrazines”) found in grape skin and stems that are responsible for many “green” flavors in wine. Levels of pyrazines are dependent on viticultural practices, climate, and grape variety.COA of Formula: C7H5N3