The Construction of 2D Networks on Surface via Host-guest Interaction Keisuke Katayama Tobe Lab.

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Presentation 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 M 12 L 24 Molecular Spheres Fujita, M.; et. al. Science 2006, 313, Formation of a liquid-like fluorous droplet, composed of 24 perfluoroalkylchains confined in the interior of a 5-nanometer-sized, roughly spherical shell

perfluorooctane Perfluoroalkane can be Accomodated in Cage The fluorous core could accommodate fluorinated compounds through fluorophilic host-guest interaction. Fujita, M. et. al. Science 2006, 313,

2D Self Assembly via Hydrogen Bonding N. Champness. et al. Nature 2003, 424, Perylenediimide (PDI) Melanine Network model Hydrogen Bonding

2D Host-Guest Interaction N. Champness. et al. Nature 2003, 424, C 60 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

An STM Image of Honeycomb structure of DBAOC20 Tobe, Y. et al. Chem. Commun. 2010, 46, 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 NGDBAOC18 and NG DBAOC20 and NG Nanographene (NG)

Purpose of this Work Guest Selectivity

Molecular Design DBAOC14R F Fluorophilic 2D nano pores =

An STM Image of Monolayer of DBAOC14R F at 1-Phenyloctane/Graphite Interface DBAOC14R F =

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.