POS5-0789
Influence of Heteroatom Substitution on the Spin and Charge Transport Properties of Isatin-Based Open-Shell Quinoidal Polymers
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Youngju Jung (Gwangju Institute of Science and Technology)
Co-Author(s)
Abstract
Open-shell conjugated polymers containing intrinsic spins along the polymer backbone have attracted increasing attention because of their unique spin-driven magnetic properties and potential applications in spintronics. Since both magnetic behavior and charge transport are important factors in spintronics, understanding how the molecular structure of open-shell conjugated polymers governs these properties is essential. In this study, two isatin-based quinoidal polymers, PQuBT and aza-substituted PazaQuBT, were synthesized to investigate the influence of heteroatom substitution on the spin and charge transport properties of open-shell conjugated polymers. The incorporation of aza units induced a more planar backbone and enhanced open-shell character in PazaQuBT, leading to a stronger EPR response. Upon thermal annealing, PazaQuBT exhibited a saturation magnetization of 8.70 μemu cm-2, which was 2.7 times higher than that of PQuBT, accompanied by enhanced spin ordering. In contrast, PQuBT underwent greater structural reorganization upon annealing, resulting in enhanced molecular ordering and higher hole mobility (8.53×10⁻² cm² V⁻¹ s⁻¹) than PazaQuBT. The distinct magnetic and charge transport characteristics observed for PQuBT and PazaQuBT are expected to result in different spin transport behaviors, highlighting their potential relevance to spintronic applications. Overall, heteroatom substitution provides an effective strategy for tuning spin-driven magnetic and charge transport properties and elucidating the structure–property relationships of open-shell conjugated polymers.
