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| The optical properties of DMCS-TPA in solvents of varying polarities were investigated by UV-vis absorption and PL spec- troscopy. For comparison, the absorption and emission spectra of BMBCP in dilute solution are shown in Fig. 1. DMCS-TPA exhibits two prominent emission bands: one with a vibrational structure that remains located at around 430 nm and the other significantly shifts from 513 nm to 595 nm with the solvent changing from hexane to chloroform. The blue region emis- sions of DMCS-TPA, which are similar in different solvents, might originate from the DCS moiety because of their analo-gous spectra with those of BMBCP in the monomer state. The hypochromatic peaks of about 21 nm relative to those of BMBCP are attributed to the twisted molecular conformation and decreased conjugation induced by the steric hindrances. |
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糖太甜521: 金币+5, 翻译EPI+1, ★★★★★最佳答案 2014-10-13 11:06:32
糖太甜521: 金币+5, 翻译EPI+1, ★★★★★最佳答案 2014-10-13 11:06:32
| 用紫外-可见吸收和PL光谱研究了在具有不同极性溶剂中DMCS-TPA的光学特性。为了进行比较,BMBCP在稀溶液的吸收光谱和发射光谱见图1。 DMCS-TPA具有两个突出的发射带:一个具有振动结构,保持位于430 nm周围,另一个当将溶剂从从己烷换为氯仿时,其峰值从513纳米显著迁移至595nm处。DMCS-TPA的蓝色发射区在不同的溶剂中是相似的,可能源于DCS的结构基团,因为在单体状态下,它们的光谱与BMBCP类似。相对于BMBCP,其低色度峰约为21 nm,是由于其扭曲的分子构象和因立体阻碍引起的低偶联。 |
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