Copper Benzoate

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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]
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.

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Copper Benzoate

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