Controlling the π-Stacking Behavior of Pyrene Derivatives: Influence of H-Bonding and Steric Effects in Different States of Aggregation
作者:Andreas T. Haedler、Holger Misslitz、Christian Buehlmeyer、Rodrigo Q. Albuquerque、Anna Köhler、Hans-Werner Schmidt
DOI:10.1002/cphc.201300242
日期:2013.6.24
to monomer fluorescence ratio in crystalline films at low temperatures. We reveal that in solution supramolecular aggregation depends predominantly on the pyrene chromophores. In the crystalline state, however, the pyrene stacking can be controlled gradually by H‐bonding and steric effects. These results are further confirmed by molecular modeling. This work bears fundamental information for tailoring
由低分子量染料分子构建的光电设备的性能关键取决于堆叠性能和生色系统的耦合。本文中,我们研究了氢键酰胺和庞大的取代基对稀溶液(作为超分子聚集体)和固态中含pyr小分子的π堆积的影响。合成了一组四种pyr衍生物,其中苯或4-叔丁基苯通过酯或酰胺与the单元相连。所有四个分子在THF溶液中形成浓度超过1×10 -4 mol L -1的超分子H-聚集体。将这些聚集体转移到固体载体上并结晶。我们调查:超分子聚集体中的准分子形成率;从非晶态到结晶态过渡过程中氢键的形成以及光学变化;以及低温下晶体膜中准分子与单体的荧光比。我们揭示了在溶液中超分子聚集主要取决于the发色团。但是,在结晶状态下,H的堆积可以通过氢键和空间效应逐渐控制。这些结果通过分子模型进一步证实。这项工作为适应功能性光电材料的固态化提供了基础信息。