Counter-ion influence on the coordination mode of the 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (bpo) ligand in mercury(II) coordination polymers, [Hg(bpo)nX2]: X = I–, Br–, SCN–, N3– and NO2–; spectroscopic, thermal, fluorescence and structural studies was written by Mahmoudi, Ghodrat;Morsali, Ali. And the article was included in CrystEngComm in 2007.COA of Formula: C12H8N4O This article mentions the following:
New mercury(II)-organic polymeric complexes generated from 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (bpo) as an angular dipyridyl derivative ligand, [Hg(bpo)nX2]: X = SCN– (1), I– (2), Br– (3), NO2– (4) and N3– (5), was prepared from reactions of the ligand bpo with different mercury(II) salts. All these compounds were characterized by elemental anal., IR-, 1H NMR-, and 13C NMR spectroscopic and structurally determined by x-ray single-crystal diffraction. The thermal stabilities of compounds 1–5 and the reported compound [Hg(μ-bpo)I2]·CH3CN (6), were studied by thermal gravimetric (TG) and differential thermal analyses (DTA). Solid-state luminescent spectra of the compounds 1–6 indicate intense fluorescent emissions at ∼470 nm. The results show the influence of the counterions on the coordination mode of the bpo ligand in the mercury ion as a soft acid that is capable of forming compounds with four-, five- and six coordination numbers and, consequently, acting in different forms of coordination polymers, containing both discrete and divergent (from 1-dimensional, 1-D to two-dimensional, 2-D) coordination frameworks. In the experiment, the researchers used many compounds, for example, 2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7COA of Formula: C12H8N4O).
2,5-Di(pyridin-4-yl)-1,3,4-oxadiazole (cas: 15420-02-7) belongs to pyridine derivatives. The pyridine ring occurs in many important compounds, including agrochemicals, pharmaceuticals, and vitamins. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. COA of Formula: C12H8N4O