Dimer/tetramer motifs determine amphiphilic hydrazine fibril structures on graphite
| Autor: | Uwe Beginn, Nadine Diek, Michael Reichling, Loji K. Thomas |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
fibrils
Materials science Stereochemistry Dimer STM General Physics and Astronomy Fibril lcsh:Chemical technology lcsh:Technology Full Research Paper symbols.namesake chemistry.chemical_compound Tetramer Molecule Nanotechnology General Materials Science lcsh:TP1-1185 Electrical and Electronic Engineering lcsh:Science Alkyl hydrazide chemistry.chemical_classification lcsh:T graphite Mesophase hydrazine self-assembly lcsh:QC1-999 Crystallography Nanoscience chemistry symbols interface lcsh:Q Self-assembly van der Waals force lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology Beilstein Journal of Nanotechnology, Vol 3, Iss 1, Pp 658-666 (2012) |
| ISSN: | 2190-4286 |
| Popis: | Fibril structures are produced at a solvent–graphite interface by self-assembly of custom-designed symmetric and asymmetric amphiphilic benzamide derivatives bearing C10 aliphatic chains. Scanning tunnelling microscopy (STM) studies reveal geometry-dependent internal structures for the elementary fibrils of the two molecules that are distinctly different from known mesophase bulk structures. The structures are described by building-block models based on hydrogen-bonded dimer and tetramer precursors of hydrazines. The closure and growth in length of building units into fibrils takes place through van der Waals forces acting between the dangling alkyl chains. The nanoscale morphology is a consequence of the basic molecular geometry, where it follows that a closure to form a fibril is not always likely for the doubly substituted hydrazine. Therefore, we also observe crystallite formation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|