Refinement of the crystal structure of iodine at 110° K

Abstract

The crystal structure of iodine at 110°K has been refined. The I-I bond, 2.715/1,, e.s.d. 0-006/1,, appears to be significantly longer than the bond, 2.662 A, in gaseous iodine molecules.

Metallic high-pressure modifications of main group elements

“…The transitions in this group of elements are finalized by a b-Po (6 þ 2 coordination) to bcc transition for selenium (140 GPa [101]) as well as tellurium [102]. Similarly, a step-wise transition from a molecular solid [103] towards a cubic close-packed fcc phase (Fig. 14) is observed for iodine at pressures between ambient and 55 GPa [104][105][106].…”

Iodine Is a Covalent Crystal

“…In iodine the first and the second next neighbour distances are 3.50 and 3.93Å [9]. They are noticeably less than the double van der Waals radius 4.3Å [9] (the distance between the atoms in the molecule is 2.72Å) and the second next neighbour distance in the van der Waals crystal which is about 4.6Å.…”

“…They are noticeably less than the double van der Waals radius 4.3Å [9] (the distance between the atoms in the molecule is 2.72Å) and the second next neighbour distance in the van der Waals crystal which is about 4.6Å. It is because there is covalent intermolecular interaction [4,[10][11][12][13][14].…”

Synthesis, Structure and Spectroscopy of a New Polyiodide in the α,ω-Diazaniumalkane Iodide/Iodine System

“…The 2/m-symmetric I 4 2− anion shows the typical short I-I distance of the two central iodine atoms (Fig. 1), only slightly longer than in solid iodine [12]. The bond length between the central and the terminal iodine atoms of 3.4175(4)Å is clearly within the typical range of secondary I-I halogen bonding (Table 1) [1,2].…”