Related Products of 89972-77-0. The fused heterocycle is formed by combining a benzene ring with a single heterocycle, or two or more single heterocycles. Compound: 4-(p-Tolyl)-2,2:6,2-terpyridine, is researched, Molecular C22H17N3, CAS is 89972-77-0, about Phenyl-substituted 2,2′:6′,2”-terpyridine as a new series of fluorescent compounds-their photophysical properties and fluorescence tuning. Author is Mutai, Toshiki; Cheon, Jin-Dong; Arita, Shinpei; Araki, Koji.
Several phenyl-substituted 2,2′:6′,2”-terpyridines (tpy) were synthesized and it was found that 4′-Ph tpy (I) exhibited the most effective fluorescence, whose quantum yield was up to 0.64 in cyclohexane. For further study on tuning the fluorescence properties, different substituents were introduced into the p-position of the Ph group. While some dyes showed their absorption and fluorescence in the same region as I, others were observed at much longer wavelengths. In addition, fluorescence maxima of some of the dyes showed a large (>130 nm) solvent dependence. The difference between ground and excited state dipole moments (Δμ) for one dye was estimated to be 15.2 D by the Lippert-Mataga equation, indicating an intramol. charge transfer (ICT) process. Semi-empirical MO calculation (MOPAC/AM1) demonstrated that the HOMO-1, HOMO, and LUMO of I and several other dyes were mainly localized on the Ph (πph), tpy (πtpy) and tpy (π*tpy) part, resp., indicating that the lowest energy absorption band of these dyes was the local excitation (πtpy-π*tpy). In the case of dyes having an electron-donating substituent, πph instead of πtpy became the HOMO. Thus, the lowest energy absorption these dyes was an ICT transition (πph-π*tpy), and a large red shift of the fluorescence occurred. In these compounds, the energy level of πph is controlled without affecting that of πtpy and π*tpy, suggesting a novel approach for tuning the color of fluorescence.
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Reference:
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI