Thiophene-bridged triphenylamine dimers exhibit two-step near-infrared electrochromism with tunable absorptions extending deep into the NIR-III region. This simple yet powerful molecular design suggests a practical structural boundary for achieving reliable NIR-to-NIR optical switching, offering new insight into how π-extension and charge delocalization cooperatively govern long-wavelength responsiveness.
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M. Yano, K. Nakazawa, S. Yamada, Y. Yamamoto, T. Yajima, K. Mitsudo and Y. Kashiwagi, Phys. Chem. Chem. Phys., 2026, Advance Article , DOI: 10.1039/D5CP04771D
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