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

Sefer, Emre
Tonga, Murat
Toppare, Levent Kamil
Çırpan, Ali
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.

Citation Formats
E. Sefer, S. O. HACIOGLU, M. Tonga, L. K. Toppare, A. Çırpan, and S. KOYUNCU, “A Novel Near-IR Effective Pyrene-Based Donor-Acceptor Electrochrome,” MACROMOLECULAR CHEMISTRY AND PHYSICS, vol. 216, no. 8, pp. 829–836, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46812.