Holmium citrate under LED and CFL lighting.
| IUPAC name
| Systematic IUPAC name
|Molar mass||354.03002 g/mol|
|Appearance||Yellow or pink solid (depending on the illumination source)|
|Melting point||309.6 °C (589.3 °F; 582.8 K) (decomposes)|
|Solubility||Insoluble in halocarbons, hydrocarbons|
|Vapor pressure||~0 mmHg|
|Safety data sheet||None|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Holmium citrate (C6H5O7Ho) is the holmium salt of citric acid. It is prepared by addition of a stoichiometric amount of holmium metal to a citric acid solution. It is yellow in sunlight, incandescent light, or LED light and bright pink under the light of compact fluorescent lights.
Heating holmium citrate will cause it to decompose, yielding carbon oxides and leaving behind holmium carbonate or oxide.
Holmium citrate changes its color depending on the light source.
Adding holmium metal to citric acid solution yields holmium citrate.
- Color changing solution
- Catalyst for polyester production
The compound appears to be safe to handle without protection. Holmium has a low level of acute toxicity, and large amounts are needed to cause toxic effects.
Should be kept in closed containers, as it absorbs water from air.
Since holmium is expensive, it's best to try to recycle it.