Uranyl acetate
Hydrated crystal structure
| |
Names | |
---|---|
IUPAC name
Uranium bis((acetato)-O)dioxo-dihydrate
| |
Other names
Uranyl ethanoate; Uranyl acetate dihydrate
| |
Identifiers | |
3D model (
JSmol ) |
|
ChemSpider | |
ECHA InfoCard
|
100.007.971 |
EC Number |
|
PubChem CID
|
|
UNII |
|
CompTox Dashboard (EPA)
|
|
| |
| |
Properties | |
UO2(CH3COO)2 (anhydrous) UO2(CH3COO)2·2H2O (dihydrate) | |
Molar mass | 424.146 g/mol (dihydrate) |
Appearance | yellow-green crystals (dihydrate) |
Density | 2.89 g/cm3 (dihydrate) |
Melting point | decomposes at 80 °C (dihydrate) |
7-8 g/100 ml | |
Solubility | slightly soluble in ethanol[1] |
Hazards | |
GHS labelling: | |
Danger | |
H300, H330, H373, H411 | |
P260, P264, P270, P271, P273, P284, P301+P310, P304+P340, P310, P314, P320, P321, P330, P391, P403+P233, P405, P501 | |
Safety data sheet (SDS) | External MSDS |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|
Uranyl acetate is the
laboratory tests
. Structurally, it is a coordination polymer with formula UO2(CH3CO2)2(H2O)·H2O.
Structure
In the polymer,
aquo ligand and a bidentate acetate ligand. One water of crystallization occupies the lattice.[2]
Uses
Uranyl acetate is extensively used as a negative stain in
low-voltage electron microscopy
technique may be more suitable.
1% and 2% uranyl acetate solutions are used as an
titrant in stronger concentrations in analytical chemistry, as it forms an insoluble salt with sodium
(the vast majority of sodium salts are water-soluble). Uranyl acetate solutions show evidence of being sensitive to light, especially UV, and will precipitate if exposed.
Uranyl acetate is also used in a standard test—American Association of State Highway and Transportation Officials (AASHTO) Designation T 299—for
alkali-silica reactivity
in aggregates (crushed stone or gravel) being considered for use in cement concrete.
Uranyl acetate dihydrate has been used as a starting reagent in experimental inorganic chemistry.[4]
Related compounds
Uranyl carboxylates are known for diverse carboxylic acids (formate, butyrate, acrylate).[5]
Safety
Uranyl acetate is both chemically toxic and mildly
radioactive. Chronic-exposure effects may cumulate.[citation needed
]
In general, uranium salts exhibit
abraded skin.[citation needed
]
Microbiologists have developed a number of alternative
References
- ^
Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 3–566, ISBN 0-8493-0594-2
- .
- ^ "Negative Staining" University of Oxford
- .
- .
- ^ Yamaguchi K, Suzuki K, Tanaka K (2010) Examination of electron stains as a substitute for uranyl acetate for the ultrathin sections of bacterial cells. J Electron Microsc (Tokyo) 59:113–118
- PMID 32008069.
- ^ Hosogi N, Nishioka H, Nakakoshi M (2015) Evaluation of lanthanide salts as alternative stains to uranyl acetate. Microscopy (Oxf) 64:429–435
- ^ Inaga S, Katsumoto T, Tanaka K, Kameie T, Nakane H, Naguro T (2007) Platinum blue as an alternative to uranyl acetate for staining in transmission electron microscopy. Arch Histol Cytol 70:43–49
- ^ Ikeda K, Inoue K, Kanematsu S, Horiuchi Y, Park P (2011) Enhanced effects of nonisotopic hafnium chloride in methanol as a substitute for uranyl acetate in TEM contrast of ultrastructure of fungal and plant cells. Microsc Res Tech 74:825–830
- ^ Sato S, Adachi A, Sasaki Y, Ghazizadeh M (2008) Oolong tea extract as a substitute for uranyl acetate in staining of ultrathin sections. J Microsc 229:17–20
- ^ He X, Liu B (2017) Oolong tea extract as a substitute for uranyl acetate in staining of ultrathin sections based on examples of animal tissues for transmission electron microscopy. J Microsc 267:27–33