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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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1樓 2014-10-20 11:36:23

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yhc0316: 金幣+70, 翻譯EPI+1 2014-10-20 13:55:34

原始FLA-Cn固體的吸收和發(fā)射光譜

與烷基長度的增加，原始FLA-Cn固體的熒光顏色逐漸藍(lán)移，F(xiàn)LA-C3和FLA-C12分別具有黃色（558納米）和綠色（515納米）發(fā)光（圖2a，表1）。考慮到這些分子之間的唯一差別是其烷基長度，可以得出結(jié)論，該烷基鏈可影響FLA-Cn的固態(tài)聚合行為。但應(yīng)當(dāng)注意到，關(guān)于烷基鏈長度對(duì)有機(jī)熒光團(tuán)的固態(tài)聚合和熒光性能的影響已經(jīng)有了相當(dāng)多的報(bào)道【10i，13,15b，16】。但有關(guān)烷基鏈長度對(duì)PFC性能影響的影響卻很少見。鏈長依賴性熒光性能對(duì)兩種晶體堆積模式（J-或H-聚合）和共軛主鏈的扭曲程度是被認(rèn)為是相對(duì)的。

為了解在結(jié)晶狀態(tài)下，同源和同分異構(gòu)體的熒光團(tuán)的不同熒光發(fā)光，一種有效而準(zhǔn)確的方法是制備和分析單晶結(jié)構(gòu)。不幸的是，無法得到高質(zhì)量的單晶FLA-Cn，可能是由于在扭曲主鏈上存在四個(gè)側(cè)烷基鏈，這不利于分子的高度有序取向和高品質(zhì)的單晶形成。最近Chi等人報(bào)道稱，在結(jié)晶狀態(tài)下，9,10 - 二（對(duì) - 烷氧基苯乙烯基）蒽（9,10-DSA）具有長鏈烷基（癸基，十一烷基和十二烷基），與含短烷基鏈（庚基，辛基和壬基）相比，有更多扭曲的共軛主鏈和較弱的分子間相互作用【10I】，這被認(rèn)為是含長鏈烷基-9,10-DSA衍生物發(fā)短PL波長，并具有更大PFC光譜移位ΔλPFC的原因

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2樓2014-10-20 12:27:17

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