Department of Chemistry and Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan 430072, China.
J Phys Chem B. 2010 Jan 14;114(1):22-7. doi: 10.1021/jp906264x.
The Suzuki coupling reaction was utilized to prepare target conjugated polymer P1, whose main chain consists of 3,5-dicyanopyridine moieties as electron acceptors and both triphenylamino groups and fluorene moieties as donors. This polymer exhibits excellent solubility in organic solvents and high thermal stability (5% of weight loss at 398 degrees C). Detailed spectroscopic studies including absorption and fluorescence emission in solvents of different polarity were also conducted. The influence of the solvent and concentration on its two-photon absorption (TPA) property was studied by a two-photon-induced fluorescence (TPIF) method. It was found that the highest two-photon absorption cross section (13,260 GM at a laser wavelength of 940 nm) appeared in 1,2-dichloroethane, a solvent with a moderate polarity. Meanwhile, with the increase of its concentration in chloroform, its TPA cross section value is reduced, implying that its two-photon absorption process in its chloroform solution is not a pure intrachain process.
铃木偶联反应被用于制备目标共轭聚合物 P1，其主链由作为电子受体的 3,5-二氰基吡啶部分以及作为供体的三苯胺基团和芴部分组成。该聚合物在有机溶剂中具有优异的溶解性和高的热稳定性（在 398°C 时 5%的重量损失）。还进行了包括在不同极性溶剂中的吸收和荧光发射在内的详细光谱研究。通过双光子诱导荧光（TPIF）方法研究了溶剂和浓度对其双光子吸收（TPA）性质的影响。结果发现，在中等极性的溶剂 1,2-二氯乙烷中出现了最高的双光子吸收截面（在 940nm 的激光波长下为 13,260 GM）。同时，随着其在氯仿中浓度的增加，其 TPA 截面值降低，这表明其在氯仿溶液中的双光子吸收过程不是纯的链内过程。
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