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首页> 外文期刊>Synthetic Metals >Synthesis and lanthanide-sensing behaviour of polyfluorene/l,10-phenanthroline copolymers
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Synthesis and lanthanide-sensing behaviour of polyfluorene/l,10-phenanthroline copolymers

机译：聚芴/ 1,10-菲咯啉共聚物的合成及其对镧系元素的感应行为

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摘要

Copolymers containing alternating fluorene and 1,10-phenanthroline units, prepared by Suzuki coupling, were found to be capable of binding with Eu~(3+) and Tb~(3+) ions in the presence of dibenzoylmethane (dbm) or acetylacetonate (acac) ligands. Photoluminescence studies of the Eu-containing polymer showed a measurable additional longer wavelength emission on complexation compared to the uncomplexed polymer. Narrow linewidth red emission from the metal-centred Eu f states (~5D_0 -> ~7F_2) was only observed on raising the concentration of the solution or in the solid state. The lack of intra-chain energy transfer to the Eu atomic levels at low concentration is proposed to be due to the low-spectral overlap between fluorene emission and ligand absorption. The Tb-containing polymer emission evolves into a broad, polymer backbone-based green emission at higher concentrations and in the solid state. Here, the stabilization of phen triplet levels due to conjugation with respect to the Tb atomic levels prevents energy transfer to the Tb metal states. Solution time-resolved emission studies on both polymers showed that after complexation, in addition to the emission from the unmodified polymer, a new long wavelength singlet emission emerges with slightly longer lifetime (0.7-2 ns).
机译：通过Suzuki偶联制备的含有交替芴和1,10-菲咯啉单元的共聚物在二苯甲酰甲烷（dbm）或乙酰丙酮化物存在下能够与Eu〜（3+）和Tb〜（3+）离子结合（ acac）配体。含Eu聚合物的光致发光研究表明，与未络合的聚合物相比，络合时可测得的波长更长。仅在提高溶液浓度或处于固态时，才能观察到以金属为中心的Eu f状态（〜5D_0->〜7F_2）产生的窄线宽红色发射。有人提出，由于芴发射与配体吸收之间的光谱重叠小，因此缺乏在低浓度时将链内能量转移至Eu原子能级。含Tb的聚合物排放物以较高的浓度和固态演变成广泛的，基于聚合物主链的绿色排放物。在此，由于相对于Tb原子能级的共轭作用，phen三重态能级的稳定可防止能量转移到Tb金属态。两种聚合物的固溶时间分辨发射研究表明，络合后，除未改性聚合物的发射外，还会出现新的长波长单峰发射，其寿命稍长（0.7-2 ns）。

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