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EuroSciCon Conference on Advanced Nanotechnology
April 18-19, 2019 | Paris, France
Page 23
Nano Research & Applications
ISSN: 2471-9838
Advanced Nanotechnology 2019
D
endrimers are highly branched organic macromolecules with successive
layers or generations of branch units surrounding a central core. Organic
inorganic hybrid versions have also been produced, by trapping metal ions
or metal clusters within the voids of the dendrimers. Their unusual, tree-like
topology endows these nanometer-sized macromolecules with a gradient in
branch density from the interior to the exterior, which can be exploited to
direct the transfer of charge and energy from the dendrimer periphery to
its core. We show that tinchloride, SnCl
2
and FeCl
3
complexes to the imines
groups of a spherical polyphenyl azomethine dendrimer in a stepwise fashion
according to an electron gradient, with complexation in a more peripheral
generation proceeding only after complexation in generations closer to the
core has been completed. By attaching an electron-withdrawing group to the
dendrimer core, we are able to change the complexation pattern, so that the
core imines are complexed last. By further extending this strategy, it should
be possible to control the number and location of metal ions incorporated
into dendrimer structures, which might and uses as tailored catalysts,
building blocks, or fine-controlled clusters for advanced materials. The
metal-assembly in a discrete molecule can be converted to a size-regulated
metal particle with a size smaller than 1 nmas amolecular reactor. Due to the
well-defined number of metal particles in the subnanometer size region, its
property is much different from that of bulk or general metal nanoparticles.
Synthesis of Pt subnano catalyst
using a dendrimer reactor
Kimihisa Yamamoto
Tokyo Institute of Technology, Japan
Biography
KimihisaYamamotohasreceivedhisPhDdegrees in
Polymer Chemistry fromWaseda University in 1990.
He joined the Department of Chemistry at Keio Uni-
versity from 1997 as a Professor. Currently, he is a
Professor in the Laboratory of Chemistry and Life
Science, Tokyo Institute of Technology since 2010.
He is a Project Leader for Yamamoto Atom Hybrid
Project adopted as a Japan Science andTechnology
Agency (JST), Strategic Basic Research Program
(ERATO) started in October, 2015.
yamamoto@res.titech.ac.jpKimihisa Yamamoto., Nano Res Appl 2019, Volume:5
DOI: 10.21767/2471-9838-C2-032