Uranium(III) iodide

Identifiers

CAS Number

* 13775-18-3 Y

3D model (JSmol)

* Interactive image

ChemSpider |

* 75546

EC Number |

* 237-406-4

PubChem CID

* 53249297

InChI

* InChI=1S/3HI.U/h3*1H;/q;;;+3/p-3

Key: CDQDFXDBVYMPJX-UHFFFAOYSA-K

SMILES

* [I-].[I-].[I-].[U+3]

Properties

Chemical formula

| UI3
Molar mass | 618.74232 g/mol
Appearance  | black solid
Density | 6.78 g/cm3[1]
Melting point |  766[2] °C (1,411 °F; 1,039 K)
Structure

Crystal structure

| orthorhombic

Space group

| Ccmm, No. 63

Lattice constant

a = 432.8 pm, b = 1401.1 pm, c = 1000.5 pm

Formula units (Z)

| 4
Hazards
GHS pictograms |
GHS Signal word | Danger

GHS hazard statements

| H300, H330, H373, H411

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):

* SizeSet

Uranium triiodide is an inorganic compound with the chemical formula UI3. It is a black solid that is soluble in water.

## Production

Uranium triiodide can be obtained from the direct reaction of its constituent elements:[3]

2 U + 3 I2 → 2 UI3

When the reaction is conducted in tetrahydrofuran (THF), the product is the blue complex UI3(THF)4.[4]

## Properties

It crystallizes in the orthorhombic crystal system (plutonium tribromide-type) in the space group Ccmm with the lattice parameters a = 432.8 pm, b = 1401.1 pm, and c = 1000.5 pm and four formula units per unit cell.[1]

Uranium triiodide can be used as a Lewis acid catalyst for various Diels-Alder reactions carried out under mild conditions.[5]

## References

1. ↑ 1.0 1.1 Levy, J. H.; Taylor, J. C.; Wilson, P. W. (1975-03-01). "The structure of uranium(III) triiodide by neutron diffraction". Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry 31 (3): 880–882. doi:10.1107/S0567740875003986. ISSN 0567-7408. https://scripts.iucr.org/cgi-bin/paper?S0567740875003986.
2. ↑ Arnold F. Holleman, Nils Wiberg: Lehrbuch der Anorganischen Chemie, 102. Auflage, de Gruyter, Berlin 2007, ISBN:978-3-11-017770-1, S. 1969.
3. ↑ Handbuch der präparativen anorganischen Chemie. 2 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1978. ISBN 978-3-432-87813-3.
4. ↑ David L. Clark; Alfred P. Sattelberger (1996). "Lewis Base Adducts of Uranium Triiodide and Tris[Bis(Trimethylsilyl)Amido]Uranium". Inorganic Syntheses. 31. 307–315. doi:10.1002/9780470132623.ch55. ISBN 978-0-470-13262-3.
5. ↑ Collin, Jacqueline; Maria, Leonor; Santos, Isabel (Oct 2000). "Uranium iodides as catalysts for Diels–Alder reactions" (in en). Journal of Molecular Catalysis A: Chemical 160 (2): 263–267. doi:10.1016/S1381-1169(00)00257-0. https://linkinghub.elsevier.com/retrieve/pii/S1381116900002570.

* v
* t
* e

Uranium compounds

U(II)|

* UB2
* US

U(III)|

* UF3
* UCl3
* UI3
* UP
* U(OH)3
* UH3
* UN

| Organouranium(III) compounds|

* U(C5H5)3

|

U(IV)|

* U(BH4)4
* UCl4
* UF4
* UBr4
* UI4
* UO2
* USi2
* US2
* U(SO4)2

| Organouranium(IV) compounds|

* U(C8H8)2
* U(C5H5)4
* U(C5H5)3Cl

|

U(IV,V)|

* U2N3

U(V)|

* UCl5
* UF5
* UBr5
* UI5
* U2O5

U(V,VI)|

* U3O8

U(VI)|

* (NH4)2U2O7
* Na2U2O7
* UCl6
* UF6
* U(PO4)2
* UO3
* UO4
* UO2(CH3COO)2
* UO2(CHO2)2
* UO2CO3
* UO2CO3·2(NH4)2CO3
* UO2Cl2
* UO2F2
* UO2(NO3)2
* UO2(OH)2
* UO2(SO4)2
* ZnUO2(CH3COO)4
* UN2
* H2UO4
* UO6 (hypothetical)

U(XII)|

* UO6 (hypothetical)

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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*[CID]: Compound ID
*[H300]: Fatal if swallowed
*[H330]: Fatal if inhaled
*[H373]: May cause damage to organs through prolonged or repeated exposure
*[H411]: Toxic to aquatic life with long lasting effects
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