Well defined dialkylfluorene/oligothiophene and dialkylfluorene/dithienylvinylene alternating copolymers have been synthesized via the polycondensation of 2,7-dibromo-(9,9-dialkylfluorene) with the appropriate distannylated (oligo)thienylene component according to a Stille-type coupling reaction using tetrakis(triphenylphosphine)palladium [Pd(PPh3)4] as catalyst. The alternate incorporation of the thienylene building blocks leads to the tunability of the photoluminescent properties of the alternating copolymers. The long wavelength absorption and photoluminescence maxima of the copolymers display a subsequent bathochromic shift upon increasing the size of the (oligo)thienylene building block.
Two-photon absorbing arylamine-endcapped and dialkylfluorene-bridged benzobisthiazole compounds with high oleophilicity
申请人:Tan Loon-Seng
公开号:US08471035B1
公开(公告)日:2013-06-25
Two-photon absorbing arylamine-endcapped and dialkylfluorene-bridged benzobisthiazole-based compounds are provided. These two-photon absorbing benzobisthiazole-based compounds show high solubility in nonpolar hydrocarbon solvents (oleophilicity) and high two-photon properties, especially in the nanosecond domain of pulse-laser excitation.