Transformation from Kinetically into Thermodynamically Controlled Self-Organization of Complex Helical Columns with 3D Periodicity Assembled from Dendronized Perylene Bisimides
作者:Virgil Percec、Hao-Jan Sun、Pawaret Leowanawat、Mihai Peterca、Robert Graf、Hans W. Spiess、Xiangbing Zeng、Goran Ungar、Paul A. Heiney
DOI:10.1021/ja400639q
日期:2013.3.13
The dendronized perylene 3,4:9,10-tetracarboxylic acid bisimide (PBI), (3,4,5)12G1-1-PBI, was reported by our laboratory to self-assemble into complex helical columns containing dimers of dendronized PBI with one molecule in each stratum, with different intra- and interdimer rotation angles but identical intra- and interdimer distance of 3.5 Å, exhibiting a four-strata 2(1) helical repeat. A thermodynamically
我们实验室报道了树枝化苝 3,4:9,10-四羧酸双酰亚胺 (PBI), (3,4,5)12G1-1-PBI 自组装成复杂的螺旋柱,其中含有树枝化 PBI 的二聚体每个层中有一个分子,具有不同的二聚体内和二聚体间旋转角度,但二聚体内和二聚体间距离相同,为 3.5 Å,表现出四层 2(1) 螺旋重复。具有短程柱内有序的热力学控制的二维柱状六方相代表高温下的热力学产物,而具有3D周期性的动力学控制的单斜柱状阵列是低温下的热力学产物。加热和冷却速率高于 10 °C/min 至 1 °C/min,在低温下,二维柱状周期阵列是这种树枝状 PBI 的动力学产物。这里报告了 (3,4,5)nG1-m-PBI 库的合成和结构分析,n = 12 到 6 和 m = 1。将差示扫描量热法、粉末和取向纤维的 X 射线衍射(包括图案模拟和电子密度图重建)和固态 NMR(所有这些都作为温度和加热和冷却速率的函数)相结合,用于它们的结构分析