3 research outputs found
A Pure Blue to Highly Transmissive Electrochromic Polymer Based on Poly(3,4-propylenedioxyselenophene) with a High Optical Contrast Ratio
A new derivative of 3,4-propylenedioxyselenophene
bearing naphthalenylmethyl appeandages on the bridge, called 3,4-dihydro-3,3-bis((naphthalen-2-yl)methyl)-2<i>H</i>-selenopheno[3,4-<i>b</i>][1,4]dioxepine (ProDOS-Np<sub>2</sub>), was synthesized and polymerized via potentiostatic and
potentiodynamic methods. The electrochemically obtained polymer film
(PProDOS-Np<sub>2</sub>) is pure blue at the neutral state and highly
transparent at the oxidized state. An increase in the size of the
substituents on the bridge resulted in an increase in the optical
contrast ratio. Upon moving from naked bridge to benzyl and to naphthalenylmethyl
substituents on the bridge center, the optical contrast changed from
51% to 65% and finally to 84%, which is the second highest reported
optical contrast ratio in polyselenophene family. When compared to
polythiophene analogue, the PProDOS-Np<sub>2</sub> has lower oxidation
potential and band gap, higher optical contrast ratio, coloration
efficiency, robustness, and stability. The polymer film preserved
its properties even after thousands of cycles under ambient conditions