Alkane-assisted adsorption and assembly of phthalocyanines and porphyrins
Alkane-assisted adsorption and assembly of phthalocyanines and porphyrins
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DOI：
10.1021/ja994271p
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发表时间：
2000-06-14
影响因子：
15
通讯作者：
Bai, CL
中科院分区：
文献类型：
--
作者：
Qiu, XH;Wang, C;Bai, CL
本文证明了利用直链烷烃的稳定作用，在常温下，通过溶液直接沉积的方法，可以使平面有机分子在惰性表面上的吸附和组装达到很高的稳定性。以外围烷基化的酞菁和卟啉为例，利用复杂的分子体系可以获得最佳的拆分效果。分子核和交错的烷基部分的亚分子特征清晰可见。还观察到明显不同的堆积对称性，这可以归因于分子间和吸附-底物之间的相互作用。随着偏置电压的变化，也记录到了明显的对比度变化。这种方法可以用于其他分子的研究，观察亚分子特征，有助于获得单分散分子，特别是平面分子的二维组装。
In this paper it is demonstrated that the stabilizing effect of linear alkanes can be utilized to achieve very high stability in the adsorption and assembly of planar organic molecules on inert surfaces under ambient conditions, by direct deposition from solutions. Using peripherally alkylated phthalocyanines and porphyrins as the examples, optimal resolutions can be achieved with complex molecular systems. Submolecular features of the molecular cores and the interdigitated alkyl parts are clearly visible. Distinctly different packing symmetries were also observed and could be attributed to the intermolecular and adsorbate-substrate interactions. Appreciable contrast variations were also recorded with changing bias voltages. This approach could be adapted to the studies of other molecules to observe submolecular features and could be helpful in obtaining two-dimensional assemblies of monodispersed molecules, especially planar molecules.