Three green EC materials based on thiophene, and a green EC material based
on pyrazine are disclosed. A first thiophene derivative
(2,3-Di-thiophen-2-yl-thieno[3,4-b]pyrazine), which was previously
investigated as a nonlinear optical material, is here disclosed for its
use as an EC material, and for its incorporation into an EC device.
Synthesis of two new thiophene derivatives
(2,5-di(thien-2-yl)-3,4-di(2,2,2-trifluoro-ethoxy)-thiophene and
2,5-(2,3-dihydro-thieno[3,4-b][1,4]dioxin-5-yl)-3,4-di(2,2,2-trifluoro-et-
hoxy)-thiophene), and a new pyrazine derivative
(2,3-dibenzyl-5,7-di(thien-2-yl)thieno[3,4-b]pyrazine) are also
disclosed, since these materials are all able to selectively change to a
green color state, and can be polymerized to achieve a green EC polymer.