Infinite Polyiodide Chains in the Pyrroloperylene–Iodine Complex: Insights into the Starch–Iodine and Perylene–Iodine Complexes

Abstract

We report the preparation and X-ray crystallographic characterization of the first crystalline homoatomic polymer chain, which is part of a semiconducting pyrroloperylene-iodine complex. The crystal structure contains infinite polyiodide I∞ (δ-) . Interestingly, the structure of iodine within the insoluble, blue starch-iodine complex has long remained elusive, but has been speculated as having infinite chains of iodine. Close similarities in the low-wavenumber Raman spectra of the title compound and starch-iodine point to such infinite polyiodide chains in the latter as well.

Dichroic nanocomposites based on polymers and metallic particles: from biology to materials science

“…Finally, it is worth mentioning that Frey‐Wyssling attributed the dichroism observed with iodine in cellulose fibers to linearly ordered iodine molecules and not to iodine particles since X‐ray diffraction patterns did not reveal any evidence for the presence of iodine crystallites . Indeed, such systems are expected to contain polyiodine or polyiodides …”

1D and 2D Polybromotellurates(IV): Structural Studies and Thermal Stability

“…Polyhalides continue being an attractive research field which, although discovered almost 200 years ago, keeps providing the community of inorganic chemists with novel fascinating results . These studies, both theoretical and experimental, are important from the point of view of main group chemistry; besides, they are of interest in terms of halogen bonding concept which is intensively developed within the last years …”

Dual complex of amylose with iodine and magnetite nano‐crystallites: Enhanced superparamagnetic and catalytic performance for synthesis of spiro‐oxindoles

“…This phenomenon is attributed to scattering of X‐ray beams by iodine atoms . As reported for the blue starch–iodine complex, iodine seems to exist as polyiodide chains within the internal voids of amylose helices anchored to magnetite nanoparticles . With an iodine chain entering an amylose helix via coordination and H‐bonding with the interior hydroxyl groups of the helical polysaccharide, the preexisting water molecules are displaced and consequently the amylose molecule acquires a modified conformation .…”