title: Preparation of poly(diiododiacetylene), an ordered conjugated polymer of carbon and iodine.
abstract: 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.
authors.affiliation: Department of Chemistry, State University of New York, Stony Brook, NY 11794-3400, USA.
authors.forename: Aiwu
authors.initials: A
authors.lastname: Sun
authors.forename: Joseph W
authors.initials: JW
authors.lastname: Lauher
authors.forename: Nancy S
authors.initials: NS
authors.lastname: Goroff