The diffuse X-ray scattering and the structure of the iodine chains in bis(1,2-benzoquinonedioximato)₂nickel.0.5I[Ni(BCD)₂.0.5I]

The crystal structure of bis(tetrathiotetracene) triiodide, a one-dimensional organic metal

“…The supercell spacing is b' = 9.54 A = 1.92b and is consistent with I-I distances of approximately 2.98, 2.98 and 3.58 A along the chain. The diffuse scattering is very similar to that observed for the iodide of the N,N'-diphenyl-pphenylenediamine radical (Huml, 1967), where the triiodide repeat is 9.43 /~, and for an iodide oxidation product of bis(1,2-benzoquinone dioximato)nickel (Endres, Keller, Megnamisi-Belomb& Moroni, Pritzkow & Weiss, 1975), where the spacing is 9.46 /~,. Such a spacing indicates considerable interaction between triiodide ions since normal triiodide bonds are about 2.92 A (Runsink, Swen-Walstra & Migchelsen, 1972) and the van der Waals radius of iodine is 2.15 /~ (Pauling, 1960), giving an expected repeat distance of at least 10.1 /~ for noninteracting I 3 ions.…”

Structure of iodide ions in iodinated nylon 6 and the evolution of hydrogen bonds between parallel chains in nylon 6

“…This can be accomplished by the arrangement shown schematically in Figure 10 by using the distances found by crystallographic analysis of iodine complexes of small organic molecules. 19,23,24 This model suggests that I5~c an be regarded as I2-I -I2 units. Such a model represents a highly ordered structure, and the disorder along the chain axis might be expected to yield the observed average iodine-iodine distance of 3.2 A.…”

Conductive molecular crystals. Structural, electrical, and magnetic properties of partially oxidized octamethyltetrabenzporphyrinatonickel(II)

“…

Oxidation of l,4,5,8,9,12,13,, Ni(OMTBP), by elemental iodine yields two distinct complexes, Ni(OMTBP)(l3)p, where p = 0.36 and 0.97. The two complexes were characterized by resonance Raman and EPR spectroscopy and by static magnetic susceptibility and four-probe electrical conductivity measurements.

…”