the construction of 2d networks on surface via host-guest interaction keisuke katayama tobe lab
TRANSCRIPT
The Construction of 2D Networks on Surface via Host-
guest Interaction
Keisuke Katayama
Tobe Lab.
Contents
Self-Assembly
Host-guest Interaction
2D Self-Assembly
2D Host-Guest Interaction
Scanning Tunneling Microscopy (STM)
About DBA derivatives
My Study
Self-Assembly of Endofluorous M12L24 Molecular Spheres
Fujita, M.; et. al. Science 2006, 313, 1273-1276.
Formation of a liquid-like fluorous droplet, composed of 24 perfluoroalkylchains confined in the interior of a 5-nanometer-sized, roughly spherical shell
F
F
F
FFF
F F
FF
F F
FF
F FF
F
perfluorooctane
Perfluoroalkane can be Accomodated in Cage
The fluorous core could accommodate fluorinated compounds through fluorophilic host-guest interaction.
フッ素溶媒
水有機溶媒
Fujita, M. et. al. Science 2006, 313, 1273-1276.
2D Self Assembly via Hydrogen Bonding
NHHN
O
O
O
O
N N
N NH2H2N
NH2
N. Champness. et al. Nature 2003, 424, 1029.
Perylenediimide(PDI)
Melanine
Network model
Hydrogen Bonding
2D Host-Guest Interaction
N. Champness. et al. Nature 2003, 424, 1029.
C60
Two-component network
Three-component network!
Bright spots are adsorbed fullerene heptamer
Scanning Tunneling Microscope (STM)
STM is a powerful instrument for imaging surfaces at the atomic level.
Tunneling current
7
electron
Tunneling current
Tip
Sample
Schematic view of STM
Modes of STM Operation
Constant Height mode
Constant Current mode
Detection: height
Detection: current
R
R R
R
DBAOC10: R = OC10H21DBAOC12: R = OC12H25DBAOC14: R = OC24H29DBAOC16: R = OC16H33DBAOC18: R = OC18H37DBAOC20: R = OC20H41
R
R
An STM Image of Honeycomb structure of DBAOC20
Tobe, Y. et al. Chem. Commun. 2010, 46, 8507-8525.
Alkyl Chain Interdigitation
DBA
Honeycomb Networks of DBA Derivatives
=
2.5 nm
4.7 nm
Accommodation of Guest Molecules in Pores Formed by DBAs
=
DBAOC16 and NG DBAOC18 and NG DBAOC20 and NG
Nanographene (NG)
Purpose of this Work
Guest Selectivity
Molecular DesignDBAOC14RF
Fluorophilic 2D nano pores
=
An STM Image of Monolayer of DBAOC14RF at 1-Phenyloctane/Graphite Interface
DBAOC14RF
=
Conclusion
Investigation on the construction of the 2D molecular networks on surface with few nanometer periodicity based on self-assembly of arganic molecules has been paid great attention.
In various networks, the construction of 2D porous networks with nanoscale pores has attracted intense interest due to their use in the construction of multicomponent molecular ordering via the guest coadsorption at the pores.
We have been investigating selective guest co-adsorbtion at the functionalized pore via the attractive interactions between the pore and the guest molecules.