Draper Emily R, Lee Jonathan R, Wallace Matthew, Jäckel Frank, Cowan Alexander J, Adams Dave J
Department of Chemistry , University of Liverpool , Crown Street , Liverpool , L69 7ZD , UK . Email:
Department of Physics , University of Liverpool , Oxford Street , Liverpool , L69 7ZE , UK.
Chem Sci. 2016 Oct 1;7(10):6499-6505. doi: 10.1039/c6sc02644c. Epub 2016 Jul 1.
We show that a perylene bisimide (PBI)-based gelator forms self-sorted mixtures with a stilbene-based gelator. To form the self-sorted gels, we use a slow pH change induced by the hydrolysis of glucono-δ-lactone (GdL) to gluconic acid. We prove that self-sorting occurs using NMR spectroscopy, UV-Vis spectroscopy, rheology, and viscometry. The corresponding xerogels are photoconductive. Importantly, the wavelength dependence of the photoconductive films is different to that of the films formed from the perylene bisimide alone. Transient absorption spectroscopy of the xerogels reveals changes in the spectrum of the PBI on the picosecond timescale in the presence of stilbene with a PBI radical anion being formed within 10 ps when the stilbene is present. The ability to form the PBI radical anion under visible light leads to the enhanced spectral response of the multicomponent gels. These systems therefore have potential as useful visible-active optoelectronics.
我们表明，一种基于苝二酰亚胺（PBI）的凝胶剂与一种基于芪的凝胶剂形成了自分类混合物。为了形成自分类凝胶，我们利用葡萄糖酸 -δ-内酯（GdL）水解为葡萄糖酸所引发的缓慢pH变化。我们通过核磁共振光谱、紫外可见光谱、流变学和粘度测定法证明了自分类的发生。相应的干凝胶具有光电导性。重要的是，光电导薄膜的波长依赖性与仅由苝二酰亚胺形成的薄膜不同。干凝胶的瞬态吸收光谱揭示了在芪存在的情况下，PBI光谱在皮秒时间尺度上的变化，当芪存在时，在10皮秒内会形成一个PBI自由基阴离子基团。在可见光下形成PBI自由基阴离子基团的能力导致了多组分凝胶光谱响应的增强。因此，这些体系具有作为有用的可见光活性光电器件的潜力。
