Two-dimensinal (2D) Self

Two-dimensinal Molecular Self-assembly
Yamaga Hiroyuki
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Contents
• Self-assembly
• Two-dimensional self-assembly
• Scanning tunneling microscope (STM)
•Previous work
•Two-dimensional chirality
•My work
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What’s Self-assembly
Self-assembly :
Self-assembly can be defined as the spontaneous organization of
molecular units into ordered structures by non-covalent interactions.
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Fujita, M. et al Angew. Chem. Int. Ed., 2004, 43, 5621-5625
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.
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Intermolecular interaction
-Hydrogen bond interactionHydrogen 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.
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Intermolecular interaction
-Van der waals interactionVan 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
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Scanning Tunneling Microscope (STM)
STM is a powerful instrument for imaging surfaces at the
atomic level.
electron
Tip
Tunneling
current
Sample
Tunneling
current
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Scanning Tunneling Microscope (STM)
Ji (tunneling current)
Ji = Aexp(-Bd)
Large change
Ji : tunneling current
A, B : constant
d : distance
d (distance)
Small change
Tip
Sample
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Previous Work
Dehydrobenzo[12]annulene
(DBA) derivative
Uji-i, H.; Tobe, Y.; De Feyter, S.
et al. J. Am. Chem. Soc. 2006,
128, 3502.
Alkyl chain
interdigitation
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Two-dimensional Chirality
Chirality
Two-dimensional Chirality
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My work
DBA
Self-assembly
Self-assembly
Right-handed
Right-handed
Left-handed
Left-handed
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My work
Purpose of my work is to induce only right-handed
honeycomb structures based on molecular design.
Right-handed
Left-handed
Right-handed
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Conclusion
• Self-assembly is the spontaneous organization of molecular
units into ordered structures by non-covalent interactions.
• The control of 2D molecular self-assembly
fabrication of nanometer-scale molecular device.
enable the
• 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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