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Absorption and emission spectra of pristine FLA-Cn solids The fluorescence colors of pristine FLA-Cn solids are gradually blue-shifted with the increase of alkyl length, and FLA-C3 and FLA-C12 exhibit yellow (558 nm) and green (515 nm) emission, respectively (Fig. 2a, Table 1). On considering that the only difference between these molecules is the alkyl length, it is concluded that the alkyl chain can affect the solid-stateaggregation behavior of FLA-Cn. It should be noticed that there have been a variety of reports on the effect of length of alkyl chains on the solid-state aggregation and fluorescence properties of organic fluorophores,10i,13,15b,16 however, the reports on the effect of length of alkyl chains on the PFC behaviour are scarce. The chain length-dependent fluorescence properties are believed to be relative to both crystal packing modes (J- or Haggregation) and the distortion degree of the conjugated backbone. To understand the different uorescence emissions of homologous and isomeric uorophores in crystalline states, an effective and accurate way is to prepare and analyze the single crystal structures. Unfortunately, good-quality single crystals of FLA-Cn could not be obtained probably due to the existence of four side alkyl chains in the twisted backbone, which is unfavorable for the highly ordered alignment of molecules and the formation of high-quality single crystals. Recently, Chi et al. have reported that, in the crystalline state, 9,10-bis(p-alkoxystyryl) anthracenes (9,10-DSA) with long alkyl chains (decyl, undecyl and dodecyl) have more twisted conjugated backbones and weaker intermolecular interactions than those with short alkyl chains (heptyl, octyl and nonyl),10i which is believed to be the reason why long alkyl-containing 9,10-DSA derivatives emit shorter PL wavelengths and exhibit larger PFC spectral shifts ΔλPFC |
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yhc0316: 金币+70, 翻译EPI+1 2014-10-20 13:55:34
yhc0316: 金币+70, 翻译EPI+1 2014-10-20 13:55:34
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原始FLA-Cn固体的吸收和发射光谱 与烷基长度的增加，原始FLA-Cn固体的荧光颜色逐渐蓝移，FLA-C3和FLA-C12分别具有黄色（558纳米）和绿色（515纳米）发光（图2a，表1）。考虑到这些分子之间的唯一差别是其烷基长度，可以得出结论，该烷基链可影响FLA-Cn的固态聚合行为。但应当注意到，关于烷基链长度对有机荧光团的固态聚合和荧光性能的影响已经有了相当多的报道【10i，13,15b，16】。但有关烷基链长度对PFC性能影响的影响却很少见。链长依赖性荧光性能对两种晶体堆积模式（J-或H-聚合）和共轭主链的扭曲程度是被认为是相对的。 为了解在结晶状态下，同源和同分异构体的荧光团的不同荧光发光，一种有效而准确的方法是制备和分析单晶结构。不幸的是，无法得到高质量的单晶FLA-Cn，可能是由于在扭曲主链上存在四个侧烷基链，这不利于分子的高度有序取向和高品质的单晶形成。最近Chi等人报道称，在结晶状态下，9,10 - 二（对 - 烷氧基苯乙烯基）蒽（9,10-DSA）具有长链烷基（癸基，十一烷基和十二烷基），与含短烷基链（庚基，辛基和壬基）相比，有更多扭曲的共轭主链和较弱的分子间相互作用【10I】，这被认为是含长链烷基-9,10-DSA衍生物发短PL波长，并具有更大PFC光谱移位ΔλPFC的原因 |
2楼2014-10-20 12:27:17