Reference of 2-(5-Bromothiophen-2-yl)pyridine. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 2-(5-Bromothiophen-2-yl)pyridine, is researched, Molecular C9H6BrNS, CAS is 123784-07-6, about Synthesis and basic optical properties of new π-conjugated thiophene-pyridine co-oligomers. Author is Fukumoto, Hiroki; Kumagai, Akira; Fujiwara, Yoshiki; Koinuma, Hideomi; Yamamoto, Takakazu.
Two series of π-conjugated thiophene-pyridine co-oligomers have been prepared by palladium- or nickel-promoted carbon-carbon coupling reaction in high yields. The π-π* absorption peak of Py-Th-(Th)m-Th-Py (390-440 nm) is observed at a longer wavelength than that of Th-Py-(Th)m-Py-Th (345-410 nm) with the same m number (m = 1,2). These UV-vis data are considered to reflect a charge transfer (CT) interaction between the thiophene (donor) and pyridine (acceptor) units. Some compounds show photoluminescence in a range of 430-540 nm and give quantum yields of 20-40%. One compound, 6,6′-di-2-thienyl-3,3′-bipyridine, affords a high quantum yield of Φ = 71%. A linear correlation holds between the π-π* transition energy and the inverse of the number of the aromatic units for the oligomer series. Oligomers prepared in this series included 2,2′-[2,2′:5′,2”:5”,2”’-quaterthiophene]-5,5”’-diylbis[pyridine], 2,2′-[2,2′-bithiophene]-5,5′-diylbis[pyridine], 3,3′-(2,5-thiophenediyl)bis[6-(2-thienyl)pyridine], etc.
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