Antimony(III) Iodide Complexes with Pyridine: Structures and bonding via three pnictogen bonds

Abstract

Solid state structures of five new molecular complexes of SbI 3 with Py have been determined by single crystal X-ray structural analysis. In all complexes, all antimony atoms adopt a pseudooctahedral coordination geometry, which is completed by additional Sb•••I contacts shorter than sum of van der Waals radii, with IÀ Sb•••I angles close to 180°. Analysis of the electrostatic potentials, the orbital interactions and topological analysis indicate that these contacts are due to the presence of Sb•••I pnictogen bonds. The first example of three pnictogen bonds of SbI 3 is reported.

New Pb(II)‐Ammine complexes as intermediates from the interaction of CH3NH2 with PbX2 and CH3NH3PbX3 (X=Cl, Br)

“…This is in contrast to the recently described pyridine complexes of Sb(III)I 3 , where the interaction to the iodine anion is always the dominant one. [12] Furthermore, the new structures show the high versatility of this class of complexes, which results from the sensitive balance between bonding properties (ionic interaction, sigma-bonding, NÀ H•••XHbridges) and further external parameters (temperature, vapour pressure, pH, …).…”

The Field of Main Group Lewis Acids and Lewis Superacids: Important Basics and Recent Developments

“…Complexes of heavier antimony trihalides are mostly of polymeric nature with the coordination number of antimony increasing to six via bridging halogen atoms [80] . In the antimony triiodide – pyridine system, three pnictogen bonds with one SbI 3 unit were observed [80c] …”

Synthesis, Crystal, and Electronic Structure of (HpipeH2)2[Sb2I10](I2), with I2 Molecules Linking Sb2X10 Dimers into a Polymeric Anion: A Strategy for Optimizing a Hybrid Compound’s Band Gap

“…Octahedral anions can join into oligomers, with the number of Sb 3+ centers ranging from 2 to 10 [5, [24][25][26]. Further polymerization leads to chain-like structures of different topology [26,27] and finally to layered structures exemplified by A 3 Sb 2 X 9 (A = K, Rb, Cs, NH 4 ; X = Cl, Br, I) [28,29]. In this work, we have chosen antimony iodide and iodine because polyiodides show greater chemical and thermal stability than other polyhalides and because Sb(III) is stable against oxidation in the presence of iodine.…”