Uranyl nitrate

Uranyl nitrate
Names
	IUPAC name (T-4)-bis(nitrato-κO)dioxouranium
	Other names Uranium nitrate, Yellow salt
Identifiers
CAS Number	anhydrous: 10102-06-4 ; hexahydrate: 13520-83-7;
3D model (JSmol)	anhydrous: Interactive image; dihydrate: Interactive image; hexahydrate: Interactive image;
ChemSpider	anhydrous: 22177973 ; hexahydrate: 55548;
ECHA InfoCard	100.030.229
EC Number	anhydrous: 233-266-3;
PubChem CID	anhydrous: 24933; dihydrate: 22763670; hexahydrate: 61640;
RTECS number	hexahydrate: YR3850000;
UNII	anhydrous: 0C0WI17JYF ;
CompTox Dashboard (EPA)	anhydrous: DTXSID2037136 ;
	InChI anhydrous: InChI=1S/2NO3.2O.U/c22-1(3)4;;;/q2-1;;; Key: QWDZADMNIUIMTC-UHFFFAOYSA-N ; dihydrate: InChI=1S/2NO3.2H2O.2O.U/c22-1(3)4;;;;;/h;;21H2;;;/q2-1;;;;;+2 Key: SUFYIOKRRLBZBE-UHFFFAOYSA-N; hexahydrate: InChI=1S/2HNO3.6H2O.2O.U/c22-1(3)4;;;;;;;;;/h2(H,2,3,4);61H2;;; Key: WRIBVRZWDPGVQH-UHFFFAOYSA-N;
	SMILES anhydrous: [N+](=O)([O-])[O-].O=[U+2]=O.[O-][N+](=O)[O-]; dihydrate: [N+](=O)([O-])[O-].[N+](=O)([O-])[O-].O.O.O=[U+2]=O; hexahydrate: [N+](=O)(O)[O-].[N+](=O)(O)[O-].O.O.O.O.O.O.O=[U]=O;
Properties
Chemical formula	UO2(NO3)2
Molar mass	394.04 g/mol
Appearance	yellow-green solid ; hygroscopic
Density	3.5 g/cm3 (dihydrate)
Melting point	60.2 °C (140.4 °F; 333.3 K)
Boiling point	118 °C (244 °F; 391 K) (decomposition)
Solubility in water	g/100g H2O: 98 (0°C), 122 (20°C), 474 (100°C)<
Solubility in tributyl phosphate	soluble
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
NFPA 704 (fire diamond)	4 0 0 OX
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LDLo (lowest published)	12 mg/kg (dog, oral); 238 (cat, oral)
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Uranyl chloride; Uranyl sulfate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Uranyl nitrate is a water-soluble yellow uranium salt with the formula UO₂(NO₃)₂ · n H₂O. The hexa-, tri-, and dihydrates are known.^[3] The compound is mainly of interest because it is an intermediate in the preparation of nuclear fuels. In the nuclear industry, it is commonly referred to as yellow salt.

Uranyl nitrate can be prepared by reaction of uranium salts with nitric acid. It is soluble in water, ethanol, and acetone. As determined by neutron diffraction, the uranyl center is characteristically linear with short U=O distances. In the equatorial plane of the complex are six U-O bonds to bidentate nitrate and two water ligands. At 245 pm, these U-O bonds are much longer than the U=O bonds of the uranyl center.^[1]

^ ^a ^b Mueller, Melvin Henry; Dalley, N. Kent; Simonsen, Stanley H. (1971). "Neutron Diffraction Study of Uranyl Nitrate Dihydrate". Inorganic Chemistry. 10 (2): 323–328. doi:10.1021/ic50096a021.
^ "Uranium (soluble compounds, as U)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).
^ Peehs, Martin; Walter, Thomas; Walter, Sabine; Zemek, Martin (2007). "Uranium, Uranium Alloys, and Uranium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a27_281.pub2. ISBN 978-3527306732.

[neutron-1] Mueller, Melvin Henry; Dalley, N. Kent; Simonsen, Stanley H. (1971). "Neutron Diffraction Study of Uranyl Nitrate Dihydrate". Inorganic Chemistry. 10 (2): 323–328. doi:10.1021/ic50096a021.

[2] "Uranium (soluble compounds, as U)". Immediately Dangerous to Life or Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH).

[3] Peehs, Martin; Walter, Thomas; Walter, Sabine; Zemek, Martin (2007). "Uranium, Uranium Alloys, and Uranium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a27_281.pub2. ISBN 978-3527306732.

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