2006/05/18 by Aiwu Sun, Joseph W. Lauher, Nancy S. Goroff · 1 citation
Chemistry · Materials Science · #Polydiacetylene-based materials and applications #Covalent Organic Framework Applications #Synthesis and Properties of Aromatic Compounds
paper · doi:10.1126/science.1124621
openalex publication_date 2006/05/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23
Conjugated organic polymers generally must include large substituents for stability, either contained within or appended to the polymer chain. In polydiacetylenes, the substituents fulfill another important role: During topochemical polymerization, they control the spacing between the diyne monomers to produce an ordered polymer. By using a co-crystal scaffolding, we have prepared poly(diiododiacetylene), or PIDA, a nearly unadorned carbon chain substituted with only single-atom iodine side groups. The monomer, diiodobutadiyne, forms co-crystals with bis(nitrile) oxalamides, aligned by hydrogen bonds between oxalamide groups and weak Lewis acid-base interactions between nitriles and iodoalkynes. In co-crystals with one oxalamide host, the diyne undergoes spontaneous topochemical polymerization to form PIDA. The structure of the dark blue crystals, which look copper-colored under reflected light, has been confirmed by single-crystal x-ray diffraction, ultraviolet-visible absorption spectroscopy, and scanning electron microscopy.