Uranyl formate

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|Section1={{Chembox Identifiers

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 78394

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/2CH2O2.2O.U/c2*2-1-3;;;/h2*1H,(H,2,3);;;

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = SFIHWLKHBCDNCE-UHFFFAOYSA-N

| CASNo_Ref = {{cascite|changed|??}}

| CASNo = 16984-59-1

| PubChem = 86897

| SMILES = O=CO.O=CO.O=[U]=O

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|Section2={{Chembox Properties

| Formula = (UO₂(CHO₂)₂·H₂O)

| MolarMass = 378.08 g/mol

| Appearance = fine yellow powder

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| MeltingPtC = 110

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|Section3={{Chembox Hazards

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

It is used as a negative stain in transmission electron microscopy (TEM) because it exhibits a finer grain structure than uranyl acetate. However, uranyl formate does not easily dissolve, and once in solution, it has a limited lifespan as a stain. Typical aqueous solution concentrations are 0.5% or 1%. It is highly sensitive to light, especially ultraviolet light, and will precipitate upon exposure.