Extended liquid-crystalline oligofluorenes with photo- and electroluminescence
作者:Jesús del Barrio、Luiz Silvino Chinelatto Jr.、José Luis Serrano、Luis Oriol、Milagros Piñol、Henk J. Bolink
DOI:10.1039/c0nj00404a
日期:——
we report the synthesis and characterization of a series of low-molecular weight light-emitting molecules based on short oligofluorene cores, from one to three 9,9-dioctylfluorene units, elongated at the 2- and 7-positions by means of promesogenic units. The effect of this structural modification on the mesomorphic properties, as well as on the optical and electrochemical properties, is studied. The
Synthesis and photoluminescence properties of π-extended fluorene derivatives: the first example of a fluorescent solvatochromic nitro-group-containing dye with a high fluorescence quantum yield
methoxycarbonyl, cyano, and nitro groups, were synthesized. Except for the nitro group, the resulting compounds exhibited extremely highfluorescencequantumyields (ΦF >0.85 in chloroform). The diphenylfluorene containing nitro groups have higher fluorescencequantumyield (ΦF = 0.31 in N,N’-dimethyl-formamide) than other nitro-group-containing fluorophores which were previously reported (ΦF <0.1). Furthermore