Molecular clusters in two-dimensional surface-confined nanoporous molecular networks:: Structure, rigidity, and dynamics
Molecular clusters in two-dimensional surface-confined nanoporous molecular networks:: Structure, rigidity, and dynamics
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DOI：
10.1021/ja800801e
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发表时间：
2008-06-04
影响因子：
15
通讯作者：
De Feyter, Steven
中科院分区：
文献类型：
--
作者：
Lei, Shengbin;Tahara, Kazukuni;De Feyter, Steven
利用扫描隧道显微镜（STM）研究了一系列六氢三苯并[12]轮烯（DBA）衍生物在纳米石墨烯客体存在和不存在下的液/固界面自组装行为.在没有适当的客体分子的情况下，具有短烷氧基链的DBA衍生物形成二维（2D）多孔蜂窝型图案，而具有长烷氧基链的DBA衍生物主要形成致密堆积的线性型图案。添加的纳米石墨烯分子吸附在现有的2D多孔蜂窝型图案的孔中，或者更有趣的是，它们甚至将无客体的密集堆积的线性型图案转化为含客体的2D多孔蜂窝型图案。对于具有最长烷氧基链的DBA衍生物（OC 20 H41），取决于烷氧基链长度的孔径达到5.4nm。对于具有OC 20 H41链的DBA衍生物，最多可以在同一腔中容纳六个纳米石墨烯分子。主体基质改变其结构以适应客体簇的吸附。这种柔性来自于将蜂窝结构保持在一起的叉指烷氧基链之间的弱分子间相互作用。不同的动力学过程已被观察到的主机矩阵和共吸附的客体分子的水平。
The self-assembly of a series of hexadehydrotribenzo[12]annulene (DBA) derivatives has been investigated by scanning tunneling microscopy (STM) at the liquid/solid interface in the absence and presence of nanographene guests. In the absence of appropriate guest molecules, DBA derivatives with short alkoxy chains form two-dimensional (2D) porous honeycomb type patterns, whereas those with long alkoxy chains form predominantly dense-packed linear type patterns. Added nanographene molecules adsorb in the pores of the existing 2D porous honeycomb type patterns or, more interestingly, they even convert the guest-free dense-packed linear-type patterns into guest-containing 2D porous honeycomb type patterns. For the DBA derivative with the longest alkoxy chains (OC20H41), the pore size, which depends on the length of the alkoxy chains, reaches 5.4 nm. Up to a maximum of six nanographene molecules can be hosted in the same cavity for the DBA derivative with the OC20H41 chains. The host matrix changes its structure in order to accommodate the adsorption of the guest clusters. This flexibility arises from the weak intermolecular interactions between interdigitating alkoxy chains holding the honeycomb structure together. Diverse dynamic processes have been observed at the level of the host matrix and the coadsorbed guest molecules.