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Soluble conducting Polymers
The
first soluble neutral green, conjugated polymer was synthesized. The
oxidative electrochemical and chemical polymerization of monomer results in
soluble polymer with novel optical properties. The neutral polymer absorbs
blue (above 600 nm) and red colors (below 500 nm), reflecting a saturated
green color. In the oxidized form, these absorptions are depleted resulting
in a transmissive pale brown color with very
strong absorption in near infrared region. The band gap of the polymer was
found to be ca. 1.3 eV from both electrochemistry and spectroelectrochemistry.
Molecular weight approximations showed that soluble polymer samples have
sufficient conjugation length for the desired properties. Because of the
low oxidation potential of monomer (0.48 V vs Ag/Ag+), only
mild oxidizing agents are required for chemical polymerization. The
oxidant/monomer ratio should be at least 3:1 to get a desired green-colored
polymer. High green color saturation as well as the high solubility in
common organic solvents makes this polymer a promising material to bring
polymeric electrochromics closer to RGB
realization.
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Reference
“A
Processable Green Polymeric Electrochromic”,
G. Sonmez, H.B. Sonmez, C.K.F. Shen, R. Jost, Y. Rubin, F. Wudl, Macromolecules,
38, 669 (2005).
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