A Novel Near-IR Effective Pyrene-Based Donor-Acceptor Electrochrome

作者：Sefer Emre; Hacioglu Serife O; Tonga Murat; Toppare Levent; Cirpan Ali^*; Koyuncu Sermet

来源：Macromolecular Chemistry and Physics, 2015, 216(8): 829-836.

DOI：10.1002/macp.201400584

• NIR electrochromic polymers
• planar structure
• pyrenes

In this work, a novel donor-acceptor electrochromic monomer (3HTP), containing a pyrene subunit connected to a quinoxaline acceptor bridge, is synthesized. The corresponding polymer, poly-(3HTP), is directly deposited onto an indium tin oxide (ITO)/glass surface via an electrochemical process. Atomic force microscopy (AFM) images reveal that the electrochemically deposited poly-(3HTP) has a smooth surface due to self-assembly of the planar pyrene subunit. Electrochemical and optical properties are investigated via cyclic voltammetry and UV-vis absorption measurements. The polymer film shows a multielectrochromic feature at both anodic and cathodic regimes. Poly-(3HTP) exhibits a strong near-infrared (NIR) absorption at the oxidized state with an optical contrast of 88% (at 1800 nm), a very fast response time of 0.5 s and fast switching times, and long-term stability. Density functional theory calculations reveal that the molecule has a high planarity, and the NIR absorption arises from a strong intramolecular charge transfer from the polymer backbone to the planar pyrene subunit.

• 出版日期2015-4