Niobium(IV) iodide

Names
Other names

Niobium tetraiodide

Identifiers

CAS Number

* 13870-21-8

3D model (JSmol)

* Interactive image

InChI

* InChI=1S/4HI.Nb/h4*1H;/q;;;;+4/p-4

Key: RRKNUGROPHXWKT-UHFFFAOYSA-J

SMILES

* [I-].[I-].[I-].[I-].[Nb+4]

Properties

Chemical formula

| I4Nb
Molar mass | 600.52425 g·mol−1
Appearance  | grey solid[1]
Density | 5.6 g·cm−3[1]
Melting point | 503 °C[1]

Solubility in water

| reacts[1]
Related compounds

Other anions

| NbF4, NbCl4, NbBr4

Other cations

| TaI4

Related compounds

| NbI3, NbI5

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

Infobox references

Chemical compound

Niobium(IV) iodide is an iodide of niobium, with the chemical formula of NbI4.

## Preparation[edit]

Niobium(IV) iodide can be obtained by the decomposition of niobium(V) iodide under a vacuum at 206-270 °C.[2]

## Properties[edit]

Niobium(IV) iodide is a grey solid that reacts with water.[1]

Niobium(IV) iodide is an orthorhombic crystal with space group Cmc21 (No. 36).[3] Its crystal is formed by NbI6 octahedra connected by edges and also contains Nb-Nb bonds. At 348 to 417 °C, the crystal structure of niobium(IV) iodide changes.[4] Niobium(IV) iodide turns into a metal under extremely high pressure.[5]

## References[edit]

1. ^ a b c d e Haynes, William M.; Lide, David R.; Bruno, Thomas J. (2017). CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. Boca Raton, Florida. p. 76\. ISBN 978-1-4987-5429-3. OCLC 957751024.`{{cite book}}`: CS1 maint: location missing publisher (link)
2. ^ Perry, Dale L. (2011). Handbook of Inorganic Compounds. Boca Raton, FL. p. 298\. ISBN 978-1-4398-1462-8. OCLC 759865801.`{{cite book}}`: CS1 maint: location missing publisher (link)
3. ^ Dahl, L. F.; Wampler, D. L. (1962-09-01). "The crystal structure of α-niobium tetraiodide". Acta Crystallographica. 15 (9). International Union of Crystallography (IUCr): 903–911. doi:10.1107/s0365110x62002340. ISSN 0365-110X.
4. ^ Gutmann, Viktor (1967). Halogen chemistry. Volume 3 (in Dutch). London: Academic Press. p. 170\. ISBN 978-0-323-14847-4. OCLC 846981003.
5. ^ Kawamura, H.; Matsui, N.; Nakahata, I.; Kobayashi, M.; Akahama, Y.; Shirotani, I. (1998). "Structural studies of NbI4 at high pressures". Solid State Communications. 108 (12). Elsevier BV: 919–921. Bibcode:1998SSCom.108..919K. doi:10.1016/s0038-1098(98)00483-9. ISSN 0038-1098.

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Niobium compounds

Niobium(II)|

* NbS
* NbO
* NbB2

Niobium(III)|

* NbN
* Nb2S3
* NbBr3
* NbF3
* NbCl3
* NbP

Niobium(IV)|

* NbCl4
* NbC
* NbF4
* NbI4
* NbS2
* NbSe2
* NbSe3
* NbO2

Niobium(V)|

* NbBr5
* NbCl5
* NbF5
* NbI5
* NbOCl3
* Nb2O5
* Nb(ClO4)5
* NbO(NO3)3
* LiNbO3
* KNbO3

| Organoniobium(V)|

* (C5H5)2NbCl2
* Nb2(OC2H5)10

|

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Salts and covalent derivatives of the iodide ion

| HI
+H |  |  |  | He

|
|
|
|

LiI | BeI2 | BI3
+BO3 | CI4
+C | NI3
NH4I
+N | I2O4
I2O5
I4O9 | IF
IF3
IF5
IF7 | Ne
NaI | MgI2 | AlI
AlI3 | SiI4 | PI3
P2I4

PI5 | S2I2 | ICl
ICl3 | Ar
KI | CaI2 |  | ScI3 | TiI2
TiI3
TiI4 | VI2
VI3 | CrI2
CrI3 | MnI2 | FeI2
FeI3 | CoI2 | NiI2
-Ni | CuI | ZnI2 | GaI
GaI3 | GeI2
GeI4
+Ge | AsI3
As2I4
+As | Se  | IBr
IBr3 | Kr
RbI
RbI3 | SrI2 |  | YI3 | ZrI2
ZrI3
ZrI4 | NbI4
NbI5 | MoI2
MoI3 | TcI3 | RuI3 | RhI3 | PdI2 | AgI | CdI2 | InI
InI3 | SnI2
SnI4 | SbI3
+Sb | TeI4
+Te | I− | Xe
CsI
CsI3 | BaI2 |  | LuI3 | HfI3
HfI4 | TaI4
TaI5 | WI2
WI3
WI4 | ReI3
ReI
4 | OsI
OsI2
OsI3 | IrI3
IrI
4 | PtI2
PtI4 | AuI
AuI3 | Hg2I2
HgI2 | TlI
TlI3 | PbI2 | BiI3 | PoI2
PoI4 | AtI | Rn
Fr  | RaI2 |  | Lr  | Rf  | Db  | Sg  | Bh  | Hs  | Mt  | Ds  | Rg  | Cn  | Nh  | Fl  | Mc  | Lv  | Ts  | Og
| ↓  |  |
| LaI2
LaI3 | CeI2
CeI3 | PrI2
PrI3 | NdI2
NdI3 | PmI3 | SmI2
SmI3 | EuI2
EuI3 | GdI2
GdI3 | TbI3 | DyI2
DyI
3 | HoI3 | ErI3 | TmI2
TmI3 | YbI2
YbI3
AcI3 | ThI2
ThI3
ThI4 | PaI4
PaI5 | UI3
UI4 | NpI3 | PuI3 | AmI2
AmI3 | CmI3 | BkI
3 | CfI

CfI
3 | EsI2
EsI3 | Fm  | Md  | No
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