Bifacial ladder polymers hit over 90% spin polarization via chirality-induced spin selectivity
Researchers at Osaka University have designed “bifacial” ladder polymers – rigid, double-stranded polymer backbones with two deliberately different molecular faces – that show chirality-induced spin selectivity (CISS) exceeding ±90%, among the highest spin-polarization values reported for an organic chiral material.
The team’s key innovation is a chirality-assisted synthesis: a C2-chiral bifacial monomer, built with two different substituents in a syn arrangement, is polymerized so the resulting ladder polymer keeps a uniform facial orientation along the entire chain. That regioselective, “one-handed” backbone is what earlier bifacial polymer designs struggled to control. Thin films of the resulting homochiral polymer self-assemble into one-handed supramolecular helices, with circular dichroism signals over 100 times stronger than non-ladder or monomeric references, and the chiral structure survives brief exposure to 300°C.
Source: https://www.spintronics-info.com/bifacial-ladder-polymers-hit-over-90-spin-polarization-chirality-induced-spin
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