Structures, spectra and photophysics of new organic fluorophores: 2,3- and 2,5-di(phenylethenyl)furan

Palladium-Catalyzed Dehydrogenative Coupling of Furans with Styrenes

“…It should be noted that 4ha has been recently described as a potentail organic fluorophore for various applications. 15 The kinetic profiles of the formation of 3aa and 3ea, under similar conditions, have shown an induction period depending on the nature of 1 (Figure 1); such transformation being faster with 1a.…”

Synthesis, spectral properties and photobehaviour of push–pull distyrylbenzene nitro-derivatives

“…As previously reported for analogous compounds, the presence of poorly aromatic furan or thiophene is responsible for the spectral behaviour very similar to that of ␣,-diphenyloctatetraenes [17,22] and for the appearance of a second absorption band at higher energy, in the 300-400 nm range. In the case of the unsubstituted analogues, the latter band was assigned to the cis peak predicted by calculations as peculiar of the compressed rotamer [22].…”

“…The excited state relaxation yields of the compounds with a central furan group do not show important changes with respect to the unsubstituted [17] and mono(nitro)-substituted [4] analogues previously investigated (high emission and quite low isomerization yields). The sizable decrease of fluorescence and increase of reactivity of the thiophene compared to the furan derivatives, previously reported and probably due to ISC induced by the sulphur heteroatom [15], was here maintained for the methoxy-substituted NODST only, whereas the dimethylamino-substituted NNDST displays a behaviour similar to the furan analogue.…”

“…This paper deals with the synthesis and photobehaviour of the EE isomers of 2,5-distyryl-furan, 2,5-distyryl-thiophene and 2,6-distyrylpyridine derivatives with a strong electron-acceptor (nitro) group and an electron-donor substituent (dimethyl-amino or methoxy) of different strength at the opposite side. The comparison of the spectral properties and photobehaviour of the new synthesized compounds with those of the unsubstituted analogues previously studied [15][16][17][18] was particularly useful and led the role of the central ring and the side push/pull groups to be highlighted.…”

Topological and packing mode modification for solid-state emission enhancement of bis(perfluorostyryl)furan derivatives

“…Their intrinsic solidstate emission translates into improved device efficiency. 31,32 The cyano group is expected to distort the conjugated systems thus limiting -stacking. In fact, only limited knowledge about the structural effects and intermolecular factors that are required for enhancing emission of -conjugated compounds in the solid-state are known.…”