Hafnium(IV) iodide

Hafnium(IV) iodide  File:HfI4.tif

Names
IUPAC name

Hafnium(IV) iodide

Other names

hafnium tetraiodide, tetraiodohafnium

Identifiers

CAS Number

* 13777-23-6

3D model (JSmol)

* Interactive image

ChemSpider |

* 75548

EC Number |

* 621-502-1

PubChem CID

* 83726

InChI

* InChI=1S/Hf.4HI/h;4*1H/q+4;;;;/p-4

Key: YCJQNNVSZNFWAH-UHFFFAOYSA-J

SMILES

* I[Hf](I)(I)I

Properties

Chemical formula

| HfI4
Molar mass | 686.11[1]
Appearance  | red-orange[1]
Density | 5.60 g/cm3[1]
Melting point |  449 °C (840 °F; 722 K)[1]
Boiling point |  394 °C (741 °F; 667 K)[1] (sublimes)
Structure

Crystal structure

| Monoclinic, mS40

Space group

| C2/c, No. 15[2]

Lattice constant

a = 1.1787 nm, b = 1.1801 nm, c = 1.2905 nm

Related compounds

Other anions

| Hafnium(IV) fluoride
Hafnium(IV) chloride
Hafnium(IV) bromide

Other cations

| Titanium(IV) iodide
Zirconium(IV) iodide

Related compounds

| Hafnium(III) iodide

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Infobox references

Tracking categories (test):

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Hafnium(IV) iodide is the inorganic compound with the formula HfI4. It is a red-orange, moisture sensitive, sublimable solid that is produced by heating a mixture of hafnium with excess iodine.[2] It is an intermediate in the crystal bar process for producing hafnium metal.

In this compound, the hafnium centers adopt octahedral coordination geometry. Like most binary metal halides, the compound is a polymeric. It is one-dimensional polymer consisting of chains of edge-shared bioctahedral Hf2I8 subunits, similar to the motif adopted by HfCl4. The nonbridging iodide ligands have shorter bonds to Hf than the bridging iodide ligands.[2]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Haynes, William M., ed (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.66. ISBN 1439855110.
2. ↑ 2.0 2.1 2.2 Krebs, B.; Sinram, D. (1980). "Hafniumtetrajodid HfI4: Struktur und eigenschaften. Ein neuer AB4-strukturtyp". Journal of the Less Common Metals 76 (1–2): 7–16. doi:10.1016/0022-5088(80)90005-3.

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Hafnium compounds

Hf(II)|

* HfB2

Hf(IV)|

* HfC
* HfBr4
* HfCl4
* HfF4
* HfI4
* Hf(C5H7O2)4
* HfO2
* HfSiO4
* HfS2
* Ta4HfC5

HI |  |  |  | He

|
|
|
|

LiI | BeI2 | BI3 | CI4 | NI3 | I2O4,
I2O5,
I4O9 | IF,
IF3,
IF5,
IF7 | Ne
NaI | MgI2 | AlI3 | SiI4 | PI3,
P2I4 | S  | ICl,
ICl3 | Ar
KI | CaI2 | Sc  | TiI4 | VI3 | CrI3 | MnI2 | FeI2 | CoI2 | NiI2 | CuI | ZnI2 | Ga2I6 | GeI2,
GeI4 | AsI3 | Se  | IBr | Kr
RbI | SrI2 | YI3 | ZrI4 | NbI5 | Mo  | Tc  | Ru  | Rh  | Pd  | AgI | CdI2 | InI3 | SnI4,
SnI2 | SbI3 | TeI4 | I  | Xe
CsI | BaI2 |  | HfI4 | TaI5 | W  | Re  | Os  | Ir  | Pt  | AuI | Hg2I2,
HgI2 | TlI | PbI2 | BiI3 | Po  | AtI | Rn
Fr  | RaI2 |  | Rf  | Db  | Sg  | Bh  | Hs  | Mt  | Ds  | Rg  | Cn  | Nh  | Fl  | Mc  | Lv  | Ts  | Og
| ↓  |  |
La  | Ce  | Pr  | Nd  | Pm  | SmI2 | Eu  | Gd  | TbI3 | Dy  | Ho  | Er  | Tm  | Yb  | Lu
Ac  | ThI4 | Pa  | UI3,
UI4 | Np  | Pu  | Am  | Cm  | Bk  | Cf  | EsI3 | Fm  | Md  | No  | Lr

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