Photocyclodimerization and the emissive properties of 4-[2-(p-substituted phenyl)ethenyl]pyridinium ions (stilbazolium ions)(1) intercalated between clay interlayer have been studied in order to clarify the intercalation and mobility of the ions. A statistical product ratio of homo- and cross-bred cyclodimers was observed in the irradiation of an equimolar co-intercalated mixture of 4-[2-(p-tolyl)ethenyl](1b) and 4-[2-(p-cyanophenyl)ethenyl]-pyridinium chlorides (1c). In contrast, when 1b and 1c were intercalated separately, the homodimers were formed predominantly, and the cross : homo ratios increased with increasing adsorption. This indicates that the molecular diffusion of stilbazolium ions between clay particles is much slower, as was also shown by a quenching study of the excimer fluorescence of 1b by 1c.
为了弄清离子在粘土层间的插入和移动情况,研究人员对粘土层间插入的4-[2-(对位取代苯基)
乙烯基]
吡啶鎓离子(stilbazolium离子)(1)的光致环二聚化和发射特性进行了研究。在等摩尔共插入的4-[2-(
对甲苯基)
乙烯基](1b)和4-[2-(对
氰基苯基)
乙烯基]
吡啶氯化物(1c)混合物的辐照下,研究人员观察到了同源和交叉插入的环二聚体的统计产品比率。相比之下,当1b和1c分别插入时,主要形成同源二聚体,并且交叉:同源比率随着吸附量的增加而增加。这表明stilbazolium离子在粘土颗粒之间的分子扩散速度要慢得多,1b和1c的准分子荧光淬灭研究也表明了这一点。