For decades, ferromagnetism, with its time-reversal ... by antiparallel alignment of magnetic moments within a twisted crystal structure, has eluded direct observation until now.

Two high-quality single-crystal sp²c-COFs have been developed, demonstrating the generality of this approach. This work addresses the bottleneck in synthesizing single-crystal COFs and provides ...

Highly ordered single-crystal sp²c-COFs play indispensable roles in delving into the molecular structures ... metal-free ferromagnetism of 8.6 × 10⁻³ emu g⁻¹. Two high-quality single ...