Crystal structures of tropylium perchlorate and iodide

Formation and distortion of iodidoantimonates(III): the first isolated [SbI6]3−octahedron

“…1c; Bujak, 2015a;Flatken et al, 2014). At 295 K, the I 2 molecule shows an I-I distance of 2.7651 (8) Å (Table S1) which is clearly longer than in the solid iodine [2.68 Å , 2.715 (6)/2.722 (2) Å and 2.717 (2) Å determined at room temperature, 110 K and 5 K, respectively; Kitaigorodskii et al, 1953;van Bolhuis et al, 1967;Ibberson et al, (1992)]. The elongation is attributed to the IÁ Á ÁI halogen interactions with two isolated I À ions at a distance of 3.3771 (6) Å (Fig.…”

Interatomic distances in solid chlorine

“…(The distances in the case of bromine were recalculated from the parameters and lattice constants given by Vonnegut & Warren (1936), and those for iodine were calculated from the parameters of Kitaigorodskii, et al (1953) and the lattice constants of Swanson, Fuyat & Ugrinic (1954).) The shortest between-layer distances are uniformly 1.72 +0.04 A longer than the intramolecular distance; these interlayer distances are all close to twice the van der Waals radii given by Pauling (1960).…”

“…The structure described by Collin is orthorhombic, and isotypic with those of solid bromine (Vonnegut & Warren, 1936) and iodine (Harris, Mack & Blake, 1928;Kitaigorodskii, Khotsyanova & Struchkov, 1953); the two positional parameters and one isotropie temperature factor were determined by trial and error. Because of our interest in interatomic distances and thermal vibrations in simple substances, we decided to carry out …”

Interplay between non-covalent interactions in complexes and crystals with halogen bonds

“…At present, it is accepted that the effective radius of a halogen atom along the extended C7X covalent bond axis is smaller than that in the direction perpendicular to this axis. 20 Studies by Kitaigorodskii 21 and Zorkii 22 devoted to systematization of halogen ± halogen interactions, to the scatter of internuclear distances in crystals and to the search for the reference contacts are basic to the development and improvement of various scales of van der Waals radii. In 1986, Sarma and Desiraju 23 tried to systematize data on shortened Cl_Cl contacts and on the unit cell parameters of chloroaromatic compounds.…”