Preparation of Layered Perovskite-Organic Composites and their Application to Photo-induced Electroconduction

新型质子化层状钙钛矿的制备由于层状钙钛矿的数量非常有限，我们找到了一条质子化层状钙钛矿的新途径。Aurivillius相(Bi2O_2[A_&lt；n-1&gt；B_no_&lt；3n+1&gt；n=3，A=(sr，Na)，B=Nb；n=2，A=sr，B=Ta；n=2，不含A-离子，B=W)在室温下进行了酸化处理。选择性地浸出氧化铋片，并保留了类钙钛矿片的结构。为了补偿电荷，引入质子形成具有新组成的质子化层状钙钛矿，制备了层间表面烷氧基修饰的层状钙钛矿H[LaNb_2O_7]。以正构烷氧基衍生物为中间体，H[LaNb_2O_7]可被多种醇类修饰。用硅醇端基聚(二甲基硅氧烷)(Ho(SiMe_2O)_mH)对H[LaNb_2O_7]进行修饰，通过选择性浸取法制备了插层compoundsH_&lt；1.8&gt；[Bi_&lt；0.2&gt；Sr_&lt；0.8&gt；Nb_2O_7]。H[LaNb_2O_7]的甲氧基衍生物在紫外光照射下变成蓝色。蓝色在空气中逐渐消失，但在紫外线照射下可以重新显色。有色样品的电阻率明显大于未着色样品。

Preparation of new protonated layered perivskiteSince the number of layered perovskits is very limited, we found a novel route to prtonated layered perovskites. Aurivillius phases (Bi_2O_2[A_<n-1>B_nO_<3n+1>] ; n=3, A=(Sr, Na), B=Nb ; n=2, A=Sr, B=Ta ; n=2, without A-ions, B=W) were acid-treated at room temperature. Bismuth oxide sheets were selectively leached, and the structures of perovskite-like slabs were retained. For charge compensation, protons were introduced to form protonated layered perovskites with new compositions.Preparation of inorganic-organic hybridsLayered perovskite H[LaNb_2O_7] with interlayer surface modifled with alkoxyl groups was prepared. Using n-alkoxyl derivatives as intermediates, H[LaNb_2O_7] can be modified with various alcohols. In a similar fashion, H[LaNb_2O_7] can be modified with silanol-terminated poly(dimetylsiloxane) (HO(SiMe_2O)_mH).Preparation of intercalation compoundsH_<1.8>[Bi_<0.2>Sr_<0.8>Nb_2O_7] prepared via selective leaching from an Aurivillius phase Bi_2SrTa_2O_9 was allowed to react with n-alkylamines. All the n-alkylamines can form intercalation compounds via an acid-base reaction.Ptotochromism upon UV irradiationA methoxyl derivative of H[LaNb_2O_7] turned brue when it was irradiated with UV light. The blue color vanished gradually in air, but it can develop again upon UV irradiation. The electrical resistivity of the colored sample was significantly larger than that of the uncolored sample.