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Two-dimensinal Molecular Self-assembly

Two-dimensinal Molecular Self-assembly. Yamaga Hiroyuki. Contents. Self-assembly Two-dimensional self-assembly Scanning tunneling microscope (STM) Previous work Two-dimensional chirality My work. What’s Self-assembly. Self-assembly :

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Two-dimensinal Molecular Self-assembly

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  1. Two-dimensinal Molecular Self-assembly Yamaga Hiroyuki

  2. Contents • Self-assembly • Two-dimensional self-assembly • Scanning tunneling microscope (STM) • Previous work • Two-dimensional chirality • My work

  3. What’s Self-assembly Self-assembly : Self-assembly can be defined as the spontaneousorganization of molecular units into ordered structures by non-covalent interactions. Fujita, M. et al Angew. Chem. Int. Ed., 2004, 43, 5621-5625

  4. Self-assembly on Two-dimensional Surface Self-Assembly Non-porous network Porous network application ·Pattern formation in few nanometer-scale ·Molecular electronics and data storage device The control of various kind of interaction is necessary.

  5. Intermolecular interaction-Hydrogen bond interaction- Hydrogen bond interaction (水素結合相互作用) Lackinger, M.; Griessl, S.; Heckl, W. M.; Hietschold, M.; Flynn, G. W.; Langmuir, 2005, 21, 4984.

  6. Intermolecular interaction-Van der waals interaction- Van der waals interaction Bléger, D.; Kreher, D.; Mathevet, F.; Attias, A.-J.; Schull, G.; Huard, A.; Douillard, L.; Fiorini-Debuischert, C.; Charra, F. Angew. Chem. Int. Ed. 2007, 46, 7404–7407. Metal-ligand interaction, dipole-dipole interaction etc

  7. electron Tunneling current Scanning Tunneling Microscope (STM) STM is a powerful instrument for imaging surfaces at the atomic level. Tip Tunneling current Sample

  8. Scanning Tunneling Microscope (STM) Ji (tunneling current) Ji = Aexp(-Bd) Largechange Ji : tunneling current A, B : constant d : distance d (distance) Smallchange Tip Sample

  9. Previous Work Uji-i, H.; Tobe, Y.; De Feyter, S. et al. J. Am. Chem. Soc.2006, 128, 3502. Alkyl chain interdigitation Dehydrobenzo[12]annulene (DBA) derivative

  10. Two-dimensionalChirality Chirality Two-dimensional Chirality

  11. My work DBA Self-assembly Self-assembly Right-handed Left-handed Right-handed Left-handed

  12. My work Purpose of my work is to induce only right-handed honeycomb structures based on molecular design. Right-handed Left-handed Right-handed

  13. Conclusion • Self-assembly is the spontaneousorganization of molecular units into ordered structures by non-covalent interactions. • The control of 2D molecular self-assembly enable the fabrication of nanometer-scale molecular device. • The control of various kind of interaction is necessary in order to construct a complex molecular network. • 2D chirality can be evolve when objects are confined to two dimensions.

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