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)2·2H2O (dihydrate); UO2(NO3)2·3H2O (trihydrate); UO2(NO3)2·6H2O (hexahydrate);
Molar mass	430.07 g⋅mol−1 (dihydrate); 448.08 g⋅mol−1 (trihydrate); 502.13 g⋅mol−1 (hexahydrate);
Appearance	yellow-green solid, hygroscopic
Density	3.5 g/cm3 (dihydrate)
Melting point	60.2 °C (140.4 °F; 333.3 K) (hexahydrate)
Boiling point	118 °C (244 °F; 391 K) (hexahydrate, decomposition)
Solubility in water	98 g/100g (0 °C (32 °F; 273 K)); 122 g/100g (20 °C (68 °F; 293 K)); 474 g/100g (100 °C (212 °F; 373 K));
Solubility in tributyl phosphate	soluble
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H330, H373, H411
Precautionary statements	P260, P264, P270, P271, P273, P284, P301+P316, P304+P340, P316, P319, P320, P321, P330, P391, P403+P233, P405, P501
NFPA 704 (fire diamond)	4 0 0 OX
Threshold limit value (TLV)	0.2 mg/m3 (TWA), 0.6 mg/m3 (STEL)
	Lethal dose or concentration (LD, LC):
LDLo (lowest published)	12 mg/kg (dog, oral); 238 mg/kg (cat, oral);
	NIOSH (US health exposure limits):
PEL (Permissible)	0.05 mg/m3 (as Uranium)
REL (Recommended)	0.05 mg/m3 (as Uranium)
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·nH₂O. The hexa-, tri-, and dihydrates are known. 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.