Copper benzoate
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| Copper benzoate | |
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| IUPAC name | copper dibenzoate |
| Identifiers | |
| CAS number | [533-01-7] |
| InChI | 1/2C7H6O2.Cu/c2*8-7(9)6-4-2-1 -3-5-6;/h2*1-5H,(H,8,9);/q;;+2/p-2/f2 C7H5O2.Cu/q2*-1;m |
| Properties | |
| Molecular formula | C14H10CuO4 |
| Molar mass | 305.7728 g/mol |
| Appearance | blue solid |
| Related compounds | |
| Other cations | sodium benzoate |
| 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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Copper benzoate is the chemical compound with the formula [Cu(C6H5CO2)2. This coordination complex derived from the cupric ion and the conjugate base of benzoic acid. Because copper emits blue when heated in a flame, this salt has found some use as a source of blue light in fireworks.[1]
[edit] Preparation and structure
Preparation is easily done by mixing aqueous solutions of sodium benzoate or potassium benzoate and copper sulfate. Solid copper benzoate forms as a bluish-green precipitate and can be collected by filtration. The equations for these reactions are:
- 2 CuSO4 + 4 KC6H5CO2 → Cu2(C6H5CO2)4 + 2 K2SO4
As for copper(II) acetate,[2] the benzoate adopts a Chinese lantern structure," wherein a pair of copper centers are linked by four bridging carboxylate ligands. Typically one site on each copper center is occupied by water, which can be replaced by other ligands.
[edit] References
- ^ Wouter's Practical Pyrotechnics page.
- ^ Wells, A.F. (1984) Structural Inorganic Chemistry, Oxford: Clarendon Press. ISBN 0-19-855370-6.
