2，2 '-联噻吩基取代的4 H-1，2，6-噻二嗪-4-酮的溶剂依赖性光致发光线形研究
Investigation of the Solvent-Dependent Photoluminescence Lineshapes in 2,2'-Bithienyl-Substituted 4H-1,2,6- Thiadiazin-4-one
摘要：
通过吸收光谱和光致发光光谱研究了3，5-双[（2，2 '-联噻吩）-5-基]-4H-1，2，6-噻二嗪-4-酮BBT的溶剂依赖性。在极性和非极性溶剂之间的光致发光（PL）光谱中观察到很大的差异。与极性溶剂相比，非极性溶剂中的PL谱带形状具有窄带宽的特征，而在四氯化碳中，观察到蓝移物质的显著贡献，这可能是由于溶剂和分子之间的反应打破了π共轭而形成的。在PL光谱中的0-0带强度作为溶剂的函数的变化表明，较长的H-聚集体在极性溶剂的情况下具有较大的贡献。Franck-Condon分析表明，PL带形的溶剂依赖性是由于在极性溶剂中存在两个发射物种。我们建议，在极性溶剂中观察到的第二发射物种可能是由于一个稳定的电荷转移状态。
英文摘要：
The solvent dependence of 3,5-bis[(2,2'-bithien)-5-yl]-4H-1,2,6-thiadiazin-4-one BBT is investigated via absorption and photoluminescence spectroscopies. Large differences are observed in the photoluminescence (PL) spectra between polar and non-polar solvents. Narrow bandwidths characterize the PL bandshape in non-polar solvents in contrast to polar solvents, while in CCl4, a significant contribution is observed from a blue-shifted species, possibly formed owing to a reaction between the solvent and the molecule that breaks the π-conjugation. Variation of the 0-0 band intensity in the PL spectrum as a function of solvent suggests that longer H-aggregates have a larger contribution in the case of polar solvents. Franck-Condon analysis suggests that the solvent dependence of PL bandshape is owed to the presence of two emissive species in polar solvents. We propose that the second emissive species observed in polar solvents could be due to a stabilized charge-transfer state.
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