Effects of alkyl chain length, solvent and tandem Claisen rearrangement on two-dimensional structures of noncyclic isobutenyl compounds: scanning tunnelling microscopic study
作者:Yoshihiro Kikkawa、Kazuhiro Omori、Mayuko Takahashi、Masatoshi Kanesato、Kazuhisa Hiratani
DOI:10.1039/c2ob26015h
日期:——
alkyl chain length of the isobutenyl compounds. At the HOPG/PO interface, Cn-1 molecules with shorter alkyl chains (n = 14–17) showed the same zig-zag shaped 2D structure regardless of the alkyl chain length, whereas an odd–even effect was recognized in Cn-1 compounds with longer alkyl chains (n = 18–21) displaying the wavy and tripod structures, alternately. This odd–even effect was also observed at the
合成了一系列具有不同烷基链长度(C n -1)且碳原子数为n = 14-21的异丁烯基化合物,并使用扫描隧道显微镜(STM)在较高温度下系统地研究了它们的二维(2D)结构取向的热解石墨(HOPG)/溶剂界面。两种溶剂,例如1-苯基辛烷 (PO)和 1-苯基壬烷选择(PN),通过改变异丁烯基化合物的烷基链长度来检查2D结构。在HOPG / PO界面上,具有较短烷基链的C n -1分子(n = 14-17)显示相同的锯齿形2D结构,而与烷基链长无关,而在C n中则识别出奇偶效应-1个具有更长烷基链的化合物(n= 18–21)交替显示波浪形和三脚架结构。在HOPG / PN界面上也观察到了这种奇偶效应。这些结果表明,存在特定的烷基链长度范围,该范围显示了当前2D系统中的奇偶效应。串联克莱森重排(TCR)后,所有形成的C n -2化合物的2D结构都收敛为相同的线性结构,即,奇偶效应被TCR诱导的构象限制所抵消。