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Name (Title):
Masayoshi Higuchi (Independent Scientist)
Affiliation:
International Center for Materials Nanoarchitectonics
(MANA), NIMS
Address:
1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Email: HIGUCHI.Masayoshi@nims.go.jp
Home Page: http://www.nims.go.jp/fmg/entrance.html
Presentation Title:
Electrochromic Devices Using Organic-Metallic Hybrid Polymers
Abstract:
Organic-metallic hybrid polymers are formed by
complexation of organic modules and metal ions.
Metallo-supramolecular polyelectrolytes (MEPEs), in
which the organic modules are alternatively connected
with the metal ions, are one of the organic-metallic
hybrid polymers. Fe-MEPE has a purple color based on
the metal-to-ligand charge transfer (MLCT) absorption
from iron(II) ions to the terpyridyl units of the organic
module. In cyclic voltammograms, a reversible wave is
observed based on the redox between iron (II) and (III),
and the half wave potential is at 0.77 V vs, Ag/Ag + .
Interestingly, the polymer film cast on an ITO electrode
using methanol shows electrochromic properties in
acetonitrile: the purple film of the polymer becomes
almost colorless, when a voltage of 2 V is applied to the
electrode. Moreover, it is confirmed by in situ electrospectroscopic
measurements that the electrochromic
changes in the hybrid polymers show high stability for
the operations that are repeated more than 4,000 times.
In addition, multicolor electrochromic changes appear
on introducing two kinds of metal ions to the polymer.
We also succeeded in fabricating an electrochromic
solid-state device by using these polymers as shown in
the right figure.
Oral Presentation 7
References:
Proc. Natl. Acad. Sci. USA, 103, 10202 (2006); Chem. Rec., 7, 203 (2007); Adv. Mater., 19, 3928
(2007); J. Am. Chem. Soc., 130, 2073 (2008); J. Mater. Chem., 18, 4555 (2008).
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