| Autor: |
Smerdon, Joseph A., Rankin, Rees B., Greeley, Jeffrey, Guisinger, Nathan, Guest, Jeffrey |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
ACS Nano 2013, 7, 3086-3094 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1021/nn304992c |
| Popis: |
We demonstrate the self-assembly of C$_{60}$ and pentacene (Pn) molecules into acceptor-donor heterostructures which are well-ordered and -- despite the high degree of symmetry of the constituent molecules -- {\it chiral}. Pn was deposited on Cu(111) to monolayer coverage, producing the random-tiling ($R$) phase as previously described. Atop $R$-phase Pn, post-deposited C$_{60}$ molecules cause rearrangement of the Pn molecules into domains based on chiral supramolecular `pinwheels'. These two molecules are the highest-symmetry achiral molecules so far observed to coalesce into chiral heterostructures. Also, the chiral pinwheels (composed of 1 C$_{60}$ and 6 Pn each) may share Pn molecules in different ways to produce structures with different lattice parameters and degree of chirality. High-resolution scanning tunneling microscopy (STM) results and knowledge of adsorption sites allow the determination of these structures to a high degree of confidence. The measurement of chiral angles identical to those predicted is a further demonstration of the accuracy of the models. Van der Waals density functional theory calculations reveal that the Pn molecules around each C$_{60}$ are torsionally flexed around their long molecular axes and that there is charge transfer from C$_{60}$ to Pn in each pinwheel. |
| Databáze: |
arXiv |
| Externí odkaz: |
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