Effect of Double Branching in α,ω-Substituted Oligothiophenes on Thermal Solid-State Properties
作者:Jochen Gülcher、Roman Vill、Markus Braumüller、Khosrow Rahimi、Wim H. de Jeu、Ahmed Mourran、Ulrich Ziener
DOI:10.1002/ejoc.201700046
日期:2017.4.3
different dendrimer-like branched end groups were synthesized and their thermal solid-state properties were investigated. The substituents vary in terms of length of the linkers between the silicon branching points. Comparison of the series reveals that the linker connecting the oligomeric core with the first branching point has the strongest effect on the thermal properties. Furthermore, the relatively
合成了一系列系统的 septi-、nona-和 undecithiophenes 以及相应的具有五个不同树枝状分支端基的低聚物,并研究了它们的热固态特性。取代基在硅支化点之间的接头长度方面有所不同。系列的比较表明,连接寡聚核与第一个分支点的接头对热性能的影响最强。此外,对于 10 - 20 kJ mol-1 和 15 - 40 J mol-1 K-1 的低聚物,相对较大的取代基体积导致令人惊讶的低总转变焓和熵,而具有间断共轭的前低聚物分别显示 15 - 40 kJ mol-1 和 40 - 100 J mol-1 K-1 范围内的值。