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Names | |
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IUPAC name
Hafnium triiodide
| |
Identifiers | |
3D model (
JSmol)
|
|
PubChem
CID
|
|
| |
| |
Properties | |
HfI3 | |
Molar mass | 559.20 g·mol−1 |
Appearance | black crystals [1] |
Melting point | decomposes |
Related compounds | |
Other
anions
|
Hafnium(III) chloride Hafnium(III) bromide |
Other
cations
|
Titanium(III) iodide Zirconium(III) iodide |
Related compounds
|
Hafnium(IV) iodide |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Hafnium(III) iodide is an inorganic compound of hafnium and iodine with the formula Hf I3. It is a black solid. [2]
Like other group 4 trihalides, hafnium(III) iodide can be prepared from hafnium(IV) iodide by high-temperature reduction with hafnium metal, although incomplete reaction and contamination of the product with excess metal often occurs. [2]
Other metals can be used as the reducing agent, for example aluminium. The product is often nonstoichiometric, with the compositions Hf I3.2–3.3 and Hf I3.0–3.5 reported. [3] [4]
Hafnium(III) iodide adopts the same crystal structure as zirconium(III) iodide. [5] This is very similar to the β-TiCl3 structure. [2] The structure is based on hexagonal close packing of iodide ions with one third of the octahedral interstices occupied by Hf3+ ions. [2] It consists of parallel chains of face-sharing {HfI6} octahedra. [5]
Hafnium(III) iodide has a lower magnetic moment than is expected for the d1 metal ion Hf3+, indicating non-negligible Hf–Hf bonding. [2] The Hf–Hf separation was originally reported to be 3.295 Å, [6] but a subsequent study of nonstoichiometric hafnium(III) iodide indicated a lower symmetry structure. [3]
Like the chloride and bromide, hafnium(III) iodide is a powerful enough reducing agent to reduce water and therefore does not have any aqueous chemistry. [2]
![]() | |
Names | |
---|---|
IUPAC name
Hafnium triiodide
| |
Identifiers | |
3D model (
JSmol)
|
|
PubChem
CID
|
|
| |
| |
Properties | |
HfI3 | |
Molar mass | 559.20 g·mol−1 |
Appearance | black crystals [1] |
Melting point | decomposes |
Related compounds | |
Other
anions
|
Hafnium(III) chloride Hafnium(III) bromide |
Other
cations
|
Titanium(III) iodide Zirconium(III) iodide |
Related compounds
|
Hafnium(IV) iodide |
Except where otherwise noted, data are given for materials in their
standard state (at 25 °C [77 °F], 100 kPa).
|
Hafnium(III) iodide is an inorganic compound of hafnium and iodine with the formula Hf I3. It is a black solid. [2]
Like other group 4 trihalides, hafnium(III) iodide can be prepared from hafnium(IV) iodide by high-temperature reduction with hafnium metal, although incomplete reaction and contamination of the product with excess metal often occurs. [2]
Other metals can be used as the reducing agent, for example aluminium. The product is often nonstoichiometric, with the compositions Hf I3.2–3.3 and Hf I3.0–3.5 reported. [3] [4]
Hafnium(III) iodide adopts the same crystal structure as zirconium(III) iodide. [5] This is very similar to the β-TiCl3 structure. [2] The structure is based on hexagonal close packing of iodide ions with one third of the octahedral interstices occupied by Hf3+ ions. [2] It consists of parallel chains of face-sharing {HfI6} octahedra. [5]
Hafnium(III) iodide has a lower magnetic moment than is expected for the d1 metal ion Hf3+, indicating non-negligible Hf–Hf bonding. [2] The Hf–Hf separation was originally reported to be 3.295 Å, [6] but a subsequent study of nonstoichiometric hafnium(III) iodide indicated a lower symmetry structure. [3]
Like the chloride and bromide, hafnium(III) iodide is a powerful enough reducing agent to reduce water and therefore does not have any aqueous chemistry. [2]