Two novel decyloxyphenylquinoxaline-based donor-acceptor (D-A) electroactive monomers bearing dialkoxythiophene as the donor unit are synthesized using Stille coupling reaction. The corresponding polymers

poly[2

3- bis(4-decyloxyphenyl)-5

8-bis(3

4-dimethoxylthiophen-2-yl)quinoxaline] (

P1

) and poly[2

3-bis(4-decyloxyphenyl)-5

8- bis(2

3-dihydrothieno[3

4-b][1

4]

dioxin-5-yl)quinoxaline] (

P2

)

are directly deposited onto the working electrode surface by electropolymerization. All materials were characterized by nuclear magnetic resonance (NMR)

mass spectrometry (MS)

scanning electron microscopy (SEM)

cyclic voltammetry (CV)

ultraviolet-visible absorption spectrometry (UV-Vis) and spectro-electrochemical measurements. Electrochemical studies demonstrate that both polymers are capable of showing both reasonable n- and p-doping processes

and advanced long-term switching stabilities. 3

4-Ethylenedioxythiophene substituted for 3

4-dimethoxythiophene as a donor unit

which enhances the conjugated double-bond character of the conducting polymer

thus leading to a lower electronic band-gap. Likewise

the neutral state color of the synthesized polymer tuned from blue to blue-green corresponding to the red shift of the maximum absorption wavelengths in the visible region. In addition

kinetics study of

P1

revealed 42% (595 nm)

30% (839 nm) and 69% (1500 nm) transmittance changes (Δ

T

%)

while

P2

exhibited 32% (740 nm)

71% (2000 nm) at the dominant wavelengths. It was also observed that both films could switch quickly between the neutral state and oxidation state

with the response time less than 1 s both in visible and near infrared regions.