Zinc acetate
From Wikipedia, the free encyclopedia
| Zinc acetate | |
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| IUPAC name | Zinc acetate |
| Other names | Acetic acid, zinc salt Zinc(II) salt Dicarbomethoxyzinc Zinc diacetate |
| Identifiers | |
| CAS number | [557-34-6] |
| RTECS number | ZG8750000 |
| Properties | |
| Molecular formula | C4H10O6Zn (dihydrate) |
| Molar mass | 219.50 g/mol (dihydrate) 183.48 g/mol (anhydrous) |
| Appearance | White solid (all forms) |
| Melting point |
Decomposes 237 °C |
| Boiling point |
decomp. |
| Solubility in water | 43 g/100 mL |
| Structure | |
| Coordination geometry |
octahedral (dihydrate) |
| Molecular shape | tetrahedral |
| Hazards | |
| Main hazards | mildly toxic |
| R-phrases | R22 R36 R50/53 |
| S-phrases | S26 S60 S61 |
| Related compounds | |
| Other anions | Zinc chloride |
| Other cations | Copper(II) acetate |
| Related compounds | Basic beryllium acetate |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Zinc acetate is the chemical compound with the formula Zn(O2CCH3)2 but more commonly refers to the dihydrate Zn(O2CCH3)2(H2O)2. Both the hydrate and the anhydrous forms are colorless solids that are commonly used in chemical synthesis and as dietary supplements. Zinc acetates are prepared by the action of acetic acid on zinc carbonate or zinc metal.
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[edit] Basic properties and structures
Like virtually all zinc compounds, zinc acetate consists of Zn2+ ions. The acetate group is capable of binding to metal ions in a variety of ways through its two oxygen atoms and several connectiviites are observed for the various hydrates of zinc acetate. Anhydrous zinc acetate adopts a polymeric structure consisting of zinc coordinated to four oxygen atoms in a tetrahedral environment, each tetrahedron being connected to neighbors by the acetate groups.[1] The acetate ligands are not bidentate. In contrast, most metal diacetates feature metals in octahedral coordination with bidentate acetate groups. In zinc acetate dihydrate the zinc is octahedral, wherein both acetate groups are bidentate.[2]
[edit] Basic zinc acetate
Heating Zn(CH3CO2)2 in a vacuum results in loss of acetic anhydride, leaving a residue of "basic zinc acetate," with the formula Zn4O(CH3CO2)6. This cluster compound has the tetrahedral structure shown below. This species closely resembles the corresponding the analogous beryllium compound, although it is slightly expanded with Zn-O distances ~1.97 vs ~1.63 Å for Be4O(OAc)6.[3]
[edit] Applications
[edit] Dietary and medicinal applications
Zinc acetate is used as a dietary supplement and in lozenges used to treat the common cold. Zinc acetate alone is thought to be a more effective treatment than zinc gluconate.[4]
Zinc acetate can also used to treat zinc deficiencies. As an oral daily supplement it is used to inhibit the body's absorption of copper as part of the treatment for Wilson's disease. Zinc acetate is also sold as an astringent in the form of an ointment, a topical lotion; or combined with an antibiotic such as erythromycin for the topical treatment of acne. Furthermore Zinc acetate is commonly sold as a topical anti-itch ointment.
[edit] Industrial applications
Industrial applications include wood preserving, manufacturing other zinc salts, polymers, manufacture of ethylene acetate, as a dye mordant, and analytical reagent.
Zinc acetate is a precursor via a sol-gel route to the transparent semiconductor zinc oxide.
[edit] References
- ^ Capilla, A. V.; Aranda, R. A. “Anhydrous Zinc(II) Acetate (CH3-COO)2Zn” Crystal Structure Communications 1979 ,volume 8, 795-797.
- ^ Van Niekerk, J. N.; Schoening, F. R. L.; Talbot, J. H. “The Crystal Structure of Zinc Acetate Dihydrate, Zn(CH3COO)2.H2O” Acta Crystallographica 1953, volume 6, pages 720-723.
- ^ Koyama, H.; Saito, Y. “The Crystal Structure of Zinc Oxyacetate, Zn4O(CH3COO)6” Bulletin of the Chemical Society of Japan, 1954, volume 27, pages 112-114.
- ^ Eby GA (2004). "Zinc lozenges: cold cure or candy? Solution chemistry determinations". Biosci. Rep. 24 (1): 23–39. doi:. PMID 15499830.
