Uranyl formate


Uranyl formate (UO2(CHO2)2·H2O) is a fine yellow free-flowing powder occasionally used in transmission electron microscopy.

Uranyl formate
  • 16984-59-1 ☒N
3D model (JSmol)
  • Interactive image
  • 78394 checkY
ECHA InfoCard 100.037.315 Edit this at Wikidata
  • 86897
  • InChI=1S/2CH2O2.2O.U/c2*2-1-3;;;/h2*1H,(H,2,3);;; checkY
  • O=CO.O=CO.O=[U]=O
Molar mass 378.08 g/mol
Appearance fine yellow powder
Melting point 110 °C (230 °F; 383 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Infobox references

It is occasionally used as a 0.5% or 1% aqueous negative stain in transmission electron microscopy (TEM) because it shows a finer grain structure than uranyl acetate. However, uranyl formate does not easily go into solution, and once dissolved, has a rather limited lifetime as a stain. It is quite sensitive to light, especially ultraviolet light, and will precipitate if exposed.

See alsoEdit


  • 2SPI.com, compound information, retrieved May 3, 2011.