Terbium acetate
| Names | |
|---|---|
| IUPAC name
Terbium(III) acetate
| |
| Systematic IUPAC name
Terbium(III) acetate | |
| Properties | |
| [Tb(CH3COOH)3)(H2O)]2 | |
| Molar mass | 1116.26 g/mol (dimer) |
| Appearance | White solid, colorless crystals |
| Hazards | |
| Related compounds | |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Terbium acetate is the terbium salt of acetic acid. It naturally forms a dimeric tetrahydrate, [Tb(CH3COOH)3)(H2O)]2.
Contents
Properties
Chemical
Terbium acetate is a convenient source of terbium ions, and may be used for the preparation of compounds like terbium phthalocyanine. It dissolves readily in water to form a colorless solution, but is far less soluble in ethanol. However, crystals of terbium acetate will disintegrate in minutes if left in ethanol.
Terbium acetate is expected to form a coordination polymer if heated in methanol.
Physical
Terbium acetate is a colorless solid which forms triclinic crystals by evaporation, which can become quite large if left to grow for a long period of time. It is far less hygroscopic than the corresponding halides. It is also highly magnetic and can be lifted quite easily with a neodymium magnet.
Terbium acetate fluoresces bright green when exposed to ultraviolet light.
Availability
Terbium acetate is a difficult compound to purchase, due to the low availability of terbium itself. Most sources are extremely overpriced.
Preparation
Terbium acetate can be prepared by dissolving terbium metal, terbium(III) oxide, terbium hydroxide, or terbium carbonate in dilute acetic acid. Acetic acid that is too concentrated will cause terbium acetate to precipitate out. If this occurs, adding more water redissolves the material.
Projects
- Make terbium salts
- Make terbium phthalocyanine
Handling
Safety
Terbium acetate shows moderate toxicity and has no known biological role, though it may stimulate plant growth.
Storage
Terbium(III) acetate can be stored in a vial or other sealed container.
Disposal
Terbium acetate is too damn expensive to throw away, so you should probably recycle it.
References
Relevant Sciencemadness threads
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