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Vinylene-linked Diketopyrrolopyrrole Chromophores for Electrochromism

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Journal RSC Adv
Specialty Chemistry
Date 2024 Mar 27
PMID 38533099
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Abstract

We report a novel series of vinylene-linked DPP compounds (1-5) formed Knoevenagel condensation of dimethyl DPP (6) with various aromatic aldehydes. Incorporating the vinylene linkage and photo- and electro-active groups offered the distinct advantage of extending π-delocalization, resulting in deep-coloured solids with absorption maxima extending to 620-680 nm and low redox potentials. The DPP-triphenylamine compound (5) showed electrochromism in the near-infrared region. The colour of the solution changed from blue to green, and the absorption from 680 nm to 740 nm, leading to NIR-to-NIR absorption switching. This system exhibits rapid switching, swift response times (1.4 s and 1.2 s), and reversibility in electrochromic behaviour.

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