Berestetsky Naum, Vaganova Evgenia, Wachtel Ellen, Leitus Gregory, Goldberg Alexander, Yitzchaik Shlomo
Department of Inorganic and Analytical Chemistry and the Farkas Center for Light-Induced Processes, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel.
J Phys Chem B. 2008 Mar 27;112(12):3662-7. doi: 10.1021/jp711038u. Epub 2008 Mar 5.
We describe a hydrogen-bonded poly(4-vinyl pyridine)-based dielectric material, in which conductivity can be induced due to the presence of side-chain protonated species that form spontaneously when the polymer is dissolved in pyridine. The conductivity of the proton conductive gel can be controlled by direct irradiation at the proton-transfer center: a reversible change of conductivity was observed in response to the on/off switching of 385 nm wavelength radiation. Over most of the range of intensities used, the proton conductivity exhibited a bimolecular character. We present a model of the protonated pyridine side-chain unit in the ground and excited states (DFT level). In the ground state, the protonated pyridine moiety has a cyclic, conjugated structure.
我们描述了一种基于氢键的聚（4-乙烯基吡啶）介电材料，当该聚合物溶解在吡啶中时，由于侧链质子化物种的存在会自发形成，从而能够诱导出导电性。质子传导凝胶的导电性可通过在质子转移中心进行直接照射来控制：在385 nm波长辐射的开/关切换响应中观察到了导电性的可逆变化。在所用强度的大部分范围内，质子传导率呈现出双分子特性。我们提出了处于基态和激发态（密度泛函理论水平）的质子化吡啶侧链单元的模型。在基态下，质子化吡啶部分具有环状共轭结构。
