Cluster Helix Structure of the Binary Compound W₅I₁₂

Abstract

The binary tungsten iodide W5I12 forms an unprecedented one‐dimensional helical structure. A crystal structure refinement performed on basis of X‐ray powder diffraction data revealed the space group P61 [Z = 6, a = 993.97(2) pm, c = 4226.73(9) pm]. The crystal structure is based on [(W5I8i)I3aI2/2a‐a] clusters, interconnected by two shared apical iodido ligands to form helical chain arrangements.

Lithium and Sodium Ion Distributions in A2–x[W6I14] Structures

“…A preferred starting material is W 3 I 12 (W 3 I 8 •2I 2 ) because it can be produced on a large scale and in high yields. Reactions with this compound afford not only clusters with the trigonal W 3 I 8 3 cluster core but also tetrahedral W 4 I 10 , 4 square pyramidal W 5 I 12 , 5 and octahedral W 6 I 12 6 clusters. Octahedral cluster compounds A 2 [W 6 I 14 ] with A = alkali metals are of current interest because they can serve as starting materials for the preparation of ligand (L) substituted A 2 [W 6 I 8 L 6 ] clusters.…”

“…A preferred starting material is W 3 I 12 (W 3 I 8 ·2I 2 ) because it can be produced on a large scale and in high yields. Reactions with this compound afford not only clusters with the trigonal W 3 I 8 cluster core but also tetrahedral W 4 I 10 , square pyramidal W 5 I 12 , and octahedral W 6 I 12 clusters.…”

Characterization of Ax[W6I14] as Key Compounds for Ligand‐Substituted A2[W6I8L6] Clusters

“…W 3 I 8 · 2I 2 is stable in moist air and can be used as a starting material for the preparation of new binary tungsten iodides, such as the tetrahedral W 4 I 13 cluster, the square‐pyramidal W 5 I 16 , and the well‐known octahedral W 6 I 12 cluster . Moreover, a plethora of other binary tungsten iodides, such as W 5 I 12 and others are currently developed by us.…”

The First Molybdenum Oxo‐iodide Cluster – [Mo4OI12]2–

“…In contrast, the realm of Mo iodide clusters has been restricted to Mo II and Mo III . Taken into account unexpected richness of Mo and W iodide chemistry revealed by the latest works in this fields,, and rich molybdenum cluster chemistry in reduced oxide systems, other cluster types can also be found in the “reduced Mo” + “O 2– ” + “I – ” combinations.…”