Topochemical polymerization (TCP) emerges as a leading approach for synthesizing single crystalline polymers, but the untapped potential of performing TCP in a liquid medium with solid-state structural fidelity presents unsolved challenges. Here, the authors reveal details of single-crystal-to-single-crystal transformation during the TCP of chiral azaquinodimethane monomers through in situ crystallographic analysis while spotlighting a rare metastable crystalline phase.
- Chongqing Yang
- Jianfang Liu
- Yi Liu
