1286707-83-2Relevant articles and documents
Photochromic 1-benzofurylfulgides with modulated fluorescence
Makarova, Nadezhda I.,Chernyshev, Anatoly V.,Rybalkin, Vladimir P.,Zmeeva, Sofiya Yu.,Popova, Lidiya L.,Tikhomirova, Karina S.,Metelitsa, Anatoly V.,Dubonosov, Alexander D.,Bren, Vladimir A.,Minkin, Vladimir I.
, p. 1 - 10 (2017/02/05)
Spectral luminescent and photochromic properties of 5-alkoxy-2-methyl-1-benzofuran-3-yl fulgides with increasing alkyl chain length were investigated. All compounds exist in the form of ring-opened Z-isomers (λmax 344-346 nm). Under UV-irradiation they rearrange into thermally stable colored ring-closed isomers (λmax ～ 500 nm) exhibiting fluorescence emission (λmax 603-608 nm). Fluorescence in ring-closed form C is modulated by light, irradiation with visible light (546 nm) results in formation of the initial opened form O and complete quenching of the emission. The quantum efficiency of photodecoloration is by 3.47-4.25 times higher than that of the photocoloration. 5-Alkoxy-2-methyl-1-benzofuran-3-yl fulgides demonstrate high fatigue resistance and are characterized by excellent thermal stability of the photoinduced cyclic form.
Synthesis and photochromic properties of fulgides and fulgimides, 5-alkoxybenzo[b]furan derivatives
Rybalkin,Makarova,Pluzhnikova,Popova,Metelitsa,Bren',Minkina
, p. 1780 - 1784 (2015/05/20)
New heterocyclic fulgides, 3-[1-(5-alkoxy-2-methylbenzo[b]furan-3-yl)ethylidene]-4-(2-propylidene)dihydro-2,5-furandiones, and fulgimides, 1-(2-dimethylaminoethyl)-3-[(5-methoxy-2-methylbenzo[b]furan-3-yl)ethylidene]-4-(2-propylidene)dihydro-2,5-pyrroledi
Photochromism of rotation-hindered furylfulgides influenced by steric modifications
Struebe, Frank,Siewertsen, Ron,Soennichsen, Frank D.,Renth, Falk,Temps, Friedrich,Mattay, Jochen
, p. 1947 - 1955 (2011/04/27)
The syntheses of a bicyclic furylfulgide 14 and a (benzofuryl)fulgide 15 with increased steric constraints are described. Their photochromic behaviors were analyzed by means of UV/Vis spectroscopic measurements, X-ray crystallography, and NMR experiments, and the results were compared to those of the furyl(methyl)fulgide 12 and the furyl(isopropyl)fulgide 13. Compounds 13E and 14E exhibit large quantum yields of 0.57 and 0.53 for the coloration reaction (E) → (C) compared with 12E and 15E (0.23 and 0.17). After irradiation with 350 nm light, 13E and 14E are transformed into the closed (C) forms almost quantitatively, whereas 12E and 15E result in a photostationary state with mixtures of the (E), (Z), and (C) forms. The crystal structures obtained for 13E, 14E, and 15E show that the fulgides adopt cyclizable helical (P)-Eα conformations with no significant differences in atomic distances in the hexatriene unit. 2D- and temperature-dependent NMR experiments showed that the enantio- and diastereotopomerization processes were suppressed in a fulgide for the first time. Compound 14E populates only the E α conformational state. In contrast, 13E and 15E both exist in the cyclizable Eα and the non-cyclizable Eβ conformations in solution. Due to the annulated benzene ring, 15E exhibits a higher thermodynamic barrier than 13E, so the "belly roll" process was reduced for 15, but the (E) → (Z) isomerization could not be suppressed. The structural modification of 14 successfully suppressed the (E) → (Z) isomerization as well as the belly roll process. The way in which the isomerization reaction is suppressed by steric hindrance could not be fully elucidated by using these methods. Copyright
